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2hp
Cat: 725420 Rel: 19 Mar 19
 
2HP Eurorack buffered mult module - black
Notes: The 2hp Buff is a buffered multiple capable of splitting an input signal to multiple outputs. Due to its active architecture, inputs retain their full integrity as they are copied to multiple destinations. One input signal can be copied to six outputs, or two inputs can be copied to three outputs each. The Buff is especially great for splitting pitch or audio signals where signal integrity is critical. Keep your signals in shape with Buff.
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 1 in stock $73.89
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quote 725420
2hp
Cat: 725419 Rel: 19 Mar 19
 
2HP Eurorack buffered mult module - silver
Notes: The 2hp Buff is a buffered multiple capable of splitting an input signal to multiple outputs. Due to its active architecture, inputs retain their full integrity as they are copied to multiple destinations. One input signal can be copied to six outputs, or two inputs can be copied to three outputs each. The Buff is especially great for splitting pitch or audio signals where signal integrity is critical. Keep your signals in shape with Buff.
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 2 in stock $72.82
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quote 725419
2hp
Cat: 725418 Rel: 19 Mar 19
 
Voltage offset generator with three channels & voltage ranges - black
Notes: The 2hp DC is a voltage offset generator. It creates three channels of offset voltages, each with a different output range. Great for manually controlling CV inputs through a known range or summing together with CV signals to act as a bias. With the addition of a multiple, you can control several modules at once with a single knob. Take control with DC.
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 1 in stock $81.39
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quote 725418
2hp
Cat: 725417 Rel: 19 Mar 19
 
Voltage offset generator with three channels & voltage ranges - silver
Notes: The 2hp DC is a voltage offset generator. It creates three channels of offset voltages, each with a different output range. Great for manually controlling CV inputs through a known range or summing together with CV signals to act as a bias. With the addition of a multiple, you can control several modules at once with a single knob. Take control with DC.
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 2 in stock $74.97
Cat: 752435 Rel: 25 Oct 19
 
Small passive expander for the Listen Four & Listen IO modules - 4HP
Notes: The Listen Up is a small passive expander for the Listen modules that provides stereo 1/4" (6.35mm) jack inputs and outputs. It connects to one or two Listen modules and/or WAV Recorder module with the included 3-pin cables. There are four 1/4" jacks arranged in left/right pairs. The left jack of each pair can be used as a TRS stereo jack if the right jack is unpatched.
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 3 in stock $65.33
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quote 752435
Cat: 752437 Rel: 25 Oct 19
 
25W Eurorack power supply
Notes: The Row Power 25 is a clean, regulated, and protected power supply module for Eurorack systems. It requires a barrel-style power brick (15V - 20V DC) and supplies power to modules via flying bus cables, direct connection, and/or bus boards.

The Row Power 25 provides 25W of power for any Eurorack modules (typically 4-10 modules*):

+12V @ 1.4A maximum, 1.0A recommended
-12V @ 0.8A maximum, 0.5A recommended
+5V @ 1.0A maximum, 0.8A recommended

*number of modules can vary depending on each module's power consumption.

Simply plug a universal power supply (laptop style) into either of the barrel plugs on the 4HP panel. Connect your modules via flying-bus cables or the Bus Stick.

Multiple Row Power modules can be powered from a single power brick by daisy-chaining with an inexpensive barrel cable. The Row Power 25 can also be daisy-chained to Pods. Each Row Power and Pod will be independently regulated and protected for ultra-low cross-talk between rows.
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 2 in stock $97.46
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quote 752437
Cat: 577753 Rel: 06 Jun 19
 
12dB multi-mode filter - 8HP
Notes: Module A-106-5 is a 12dB multimode filter that is based on the filter circuit of the Oberheim SEM module.

The filter is equipped with a band pass output and a combined low/notch/high pass output. For this output a control knob defines the relation between low and high pass signal. If both signals appear at the same level (i.e. middle position of the Mix knob) one obtains a notch filter. Otherwise the low or high pass signal predominates.

The module does not feature self-oscillation in contrast to most of the other filters of the A-100 system.

The module generates a distorted audio signal if the level control is set to about 50% (i.e. centre position) or more with A-100 standard signals like VCOs.
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 4 in stock $70.69
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quote 577753
Cat: 731938 Rel: 10 Jun 19
 
Noise/random generator - 4HP
Notes: Module A-118-2 is the slim version of module A-118-1 and offers essentially the same features as the A-118-1. But the distances between the controls are smaller and rubberized small-sized knobs are used. In return the front panel has 4 HP only which is half the width of the A-118-1. The module is primarily planned for applications where only limited space is available. The functional difference between A-118-1 and A-118-2 is the additional T&H/S&H unit which is not included in the A-118-1.

The module generates the signals white noise, coloured noise, continuous random voltage and stepped random voltage (derived from the continuous random voltage by means of a S&H/T&H unit).

The noise signal is generated 100% analogue by amplification of the noise of a transistor. White and coloured noise are usually used as audio sources. The random voltages are normally used as control voltages (e.g. for filter frequency or any other voltage controlled parameter).

The A-118-2 gives you the ability to mix the relative amounts of Red (low frequency component) and Blue noise (high frequency component) in the coloured noise output.

For the continuous random voltage the rate of change (Rate) and amplitude (Level) of the random voltage can be adjusted. The continuous random voltage is derived from the coloured noise signal by low pass filtering. Consequently the settings of the controls for the coloured noise (Blue, Red) affect the behaviour of the random voltage! A dual colour LED (red = positive / yellow = negative output voltage) indicates the continuous random voltage.

The continuous random voltage is used as source for the S&H/T&H unit. The type of operation can be set to S&H (sample and hold) or T&H (track and hold). When T&H is chosen the output signal follows the input signal (= continuous random voltage) as long as the Clock input is "high". As soon as the clock signal changes to "low" the last voltage is stored. When S&H is chosen the input signal (= continuous random voltage) is sampled at the rising edge of the Clock signal.

For the Clock signal a "digital" signal (e.g. Clock, Gate, rectangle output of an LFO) is required. It does not work with slowly changing continuous CV signals. Another dual colour LED (red = positive / yellow = negative output voltage) indicates the stepped random voltage.
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 1 in stock $77.11
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quote 731938
Cat: 731939 Rel: 11 Jun 19
 
Voltage controlled 12dB/octave filter - 8HP
Notes: Module A-121-3 is functionally nearly identical to module A-121-2. Only the distances between the controls and sockets are smaller and rubberized, small rotary knobs are used. Therefore the front panel width is only 4HP compared to 8HP of the A-121-2. In the first place it is planned for applications where only limited space is available. The only functional difference compared to the A-121-2 is the missing attenuator for the resonance CV input CQ.

These are the most important features of the module:

- Voltage-controlled multi-mode filter with a cut-off slope of -12 dB / octave (identical to the filter of the Dark Energy II/III but has been expanded by the voltage controlled resonance feature)
- Four simultaneous outputs are available, each with different characteristics: low-pass (LP), high-pass (HP), band-pass (BP) and notch (N)
- Manual control Frequ. for the cut-off frequency of the filter (the cut-off frequency determines the point at which the respective filter effect appears)
- Two inputs for frequency control by means of external control voltages (frequency modulation, e.g. by ADSR or LFO):
- Control voltage input CV1 without attenuator, about 1V/octave sensitivity
- Control voltage input CV2 with attenuator FCV2 for the adjustment of the modulation depth of input CV2
- Frequency range about 10Hz ... 20kHz
- Manual control Q for the resonance of the filter
- Control voltage input CQ without attenuator for voltage control of the resonance
- Resonance up to self-oscillation, in which case the module will behave like a sine wave oscillator even without audio input signal
- Audio input In with attenuator Level for the adjustment of the filter input level (beyond about pos. 5 clipping/distortion occurs with typical A-100 audio levels)
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 3 in stock $95.32
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quote 731939
Cat: 577791 Rel: 10 Jul 19
 
VCA with exponential response for low level sensitivity - 8HP
Notes: Module A-131 provides voltage-controlled amplification. For audio signals, you would normally use the exponential VCA (A-131), and for control voltages, the linear VCA (A-130). It doesn't always have to be that way, though.

The amount of amplification the VCA's provide is determined by the voltage at the CV input, and the position of the gain control, which sets the overall gain in the system.

The VCA has two audio inputs, each with an attenuator. They are amplified by an amount determined by the combination of the gain and the two CV controls.
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 1 in stock $68.54
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quote 577791
Cat: 710942 Rel: 29 Nov 18
 
Dual VCA with linear response - 4HP
Notes: Module A-132-1 (Dual Low Cost VCA) contains two voltage controlled amplifiers, with a linear response most suited to regulating the level of control voltages (ADSR amount, level of vibrato effect, etc).

In non-critical situations, though, its VCAs can be used to control audio signals.

Amplification is governed by the sum of the voltages patched into the two CV inputs.
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 1 in stock $66.40
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quote 710942
Cat: 710943 Rel: 29 Nov 18
 
Quad VCA with linear curve - 8HP
Notes: Module A-132-2 contains four linear VCAs with a common level control section for all four VCAs. The module can be used for all applications of simultaneous amplitude/level control of four different audio or CV signals. The module has a manual level control Amp. and two control voltage inputs CV1 and CV2 available. CV2 is equipped with a polarizer to adjust the effect and polarity of the external control voltage.

The A-132-2 is equipped with an internal connector that can be used to normalize the four input sockets to other modules. So far only the quadrature LFO/VCO A-143-9 is equipped with a suitable matching connector. To connect the A-132-2 and the A-143-9 no soldering is required. A short 10 pin ribbon cable with removable connectors on both ends is used. For the normalling to other modules (e.g. Quad AD/LFO A-143-1, Quad ADSR A-143-2, Quad LFO A-143-3 or other modules with several outputs like VCOs or multimode VCFs) the second side of the ribbon cable has to be wired manually to the outputs of the module in question.

The maximum manual amplification for each channel is about 1.5 (i.e. "Amp." control fully CW). With an external control voltage applied to CV2 the maximum amplification goes beyond 1.5 until the signal starts to clip. The maximum output level is about 20Vpp (i.e. the signal clips at about +10V and -10V).

Typical applications:

Simultaneous level control of up to four modulation sources (e.g. ADSRs, LFOs)

Simultaneous level control of up to four audio sources (e.g. VCO outputs, multimode VCF outputs, multi-channel audio signals)

Simultaneous FM effects with different audio signals (with CV1 or CV2 in audio range)
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 2 in stock $68.54
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quote 710943
Cat: 577763 Rel: 10 Jul 19
 
8HP Eurorack module featuring two identical VCA's
Notes: Module A-132-3 is composed of two identical voltage controlled amplifiers (VCA). Each VCA has a manual gain control and a control voltage input with attenuator. The character of the control scale can be switched to linear or exponential. All inputs and outputs are DC coupled. Consequently, the VCA's can be used to process both audio and control voltages. The input has no attenuator available but is capable to process up to 16Vss signals (i.e. -8V...+8V) without distortion.
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 1 in stock $94.24
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quote 577763
Cat: 710951 Rel: 29 Nov 18
 
Two voltage controllable amplifiers which can amplify positively or inverted - 8HP
Notes: A-133 is a special dual voltage controlled amplifier that enables both positive and negative amplifications. Negative amplification means in this context that the signal is inverted. The main application of the module is the processing of control voltages, e.g. ADSR or LFO but the module can be used also for audio applications (e.g. as a waveshaper, see patch examples below).

The amplification range is about -2.5....0....+2.5 (other amplification ranges for small additional charges, e.g. -1...+1 or -5...+5). Amplification can be adjusted manually (Man control) and by an external control voltage with attenuator (CV). The present amplification is displayed with two LEDs: one for positive and one for negative amplifications (not a signal display but amplification display, similar to A-134).
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 1 in stock $84.38
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quote 710951
Cat: 716920 Rel: 29 Jan 19
 
Voltage-controlled panning module consisting of 2 linear VCA's - 8HP
Notes: A-134-1 is a voltage controlled universal panning and/or crossfader module. If the module is used a voltage controlled Panning device one audio signal is panned to two different outputs. If the module is used a voltage controlled Crossfader two audio signals are mixed to one common output. The module enables even compositions of both functions.

The module contains two linear high quality VCAs (made with CEM3381/PA381 until April 2013, SSM2164 from May 2013). VCA2 works in the opposite direction of VCA1 i.e. the more VCA1's loudness increases the more VCA2's loudness decreases. The panning or crossfading is adjusted with a control knob (manual control) and by two external control voltages, one equipped with an attenuator. Suitable control voltage sources are e.g. LFOs (A-145, A-146, A-147), envelope signals (A-140, A-141, A-142, A-119), random (A-118), Theremin (A-178) or a voltage coming from a MIDI-to-CV-Interface (A-190, A-191). The panning/crossfading is displayed with 2 LEDs.

A-134-1 has an audio input with attenuator for each VCA. If the audio input of VCA2 is not used the audio input of VCA1 is connected with audio in of VCA 2, i.e. the sockets are "normalled". The module has three audio outputs: Left Output (VCA1), Right Output (VCA2) and Mix. For Panning applications the outputs Left Out and Right Out are used. If the module is used as a Crossfader the Mix Output functions as output.

Module A-134-1 enables voltage controlled stereophonic panning effects (one audio signal distributed to two outputs), crossfading effects (two audio inputs mixed to one audio output with voltage controlled loudness proportion) and combinations of both effects.
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 1 in stock $83.53
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quote 716920
Cat: 716922 Rel: 29 Jan 19
 
Dual crossfader module for voltage controlled morphing between two audio or CV signals
Notes: Module A-134-2 contains two identical voltage controlled crossfader units.

Each unit has two voltage controlled amplifiers (VCAs) with opposite control behaviour available. The outputs of the two VCAs are mixed together to obtain a common output. The behaviour of the control voltage inputs can be chosen with an internal jumper:

Symmetrical mode: If the corresponding jumper is not set both VCAs of the crossfader have the same 50% amplification with zero CV. If the applied CV becomes positive the amplification of VCA1 decreases and those of VCA2 increases in the same way. A negative CV has the opposite result. The CV voltage range to obtain the maximum/minimum positions of the crossfader is about -2.5....+2.5V. This mode is useful for bidirectional (i.e. positive and negative) control voltages, for example LFO or joy stick (adjusted to 0V CV in centre position).

Asymmetrical mode: If the corresponding jumper is set VCA2 is fully closed and VCA1 has full 100% amplification with zero CV. If the applied CV becomes positive the amplification of VCA1 decreases and those of VCA2 increases in the same way. The CV voltage range to obtain the maximum/minimum positions of the crossfader is about 0...+5V. A negative CV has no function in this mode. This mode is useful for unidirectional (i.e. only positive) control voltages, for example ADSR, ribbon controller or Theremin control voltage.

The CV input of the upper unit (CV1) is normalled to the CV input of the lower unit (CV2). I.e. if no plug is inserted to CV2 the CV input of the upper unit (CV1) also controls the lower unit.

The second signal input of the upper unit (In1B) is normalled to the first signal input of the lower unit (In2A). I.e. if no plug is inserted into In2A the signal In1B is used as the first signal input of the second unit.

As the inputs and outputs are DC coupled the module can be used for both audio and control voltage signal processing.
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 2 in stock $70.68
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quote 716922
Cat: 716925 Rel: 29 Jan 19
 
Distortion/wavehaping module with extensive adjustment parameters - 8HP
Notes: Distortion/Waveshaper module for dynamic distortion of audio signals with extended settings. The applications of this module are waveform modifications and distortion like clipping and waveshaping of audio signals and control voltages (e.g. LFO).

The input is split by the module into three parts, processed by them and then mixed together:

- The original signal which can be amplified or attenuated with the "A" control
- Negative signal component with adjustable and voltage controllable clipping level "-L" and amplitude "-A"
- Positive signal component with adjustable and voltage controllable clipping level "+L" and amplitude "+A"

The amplitude parameters of both the positive and negative components can amplify in a positive or inverted fashion i.e. it can fold the signal. This creates additional harmonics and enriches the sound, creating very living sounds, especially when modulated by dynamic CVs.
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 2 in stock $73.15
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quote 716925
Cat: 716933 Rel: 29 Jan 19
 
Generates four phase shifted copies of a VCO signal applied to the audio input
Notes: Module A-137-2 is another version of a wave multiplier. In contrast to the A-137-1 Wave Multiplier I, the A-137-2 generates four phase-shifted copies of a VCO signal applied to the audio input. The four shifted signals are added to the original signal to obtain a fat sound similar to five independent VCOs. The phase shifting is made by a simple circuit that works only for sloped signals like sawtooth, triangle or sine, but not for rectangles or pulses.

The audio input signal (typically a sawtooth, triangle or sine wave from a VCO) is compared with a slowly varying control voltage (CV Shift In). The output of the comparator is a rectangle wave with variable pulse width. When the output of the comparatur is added to the input signal (a sawtooth in the example) with the correct level relation between both signals one obtains a phase shifted sawtooth. The left picture shows the incoming sawtooth wave on top. The two horizontal dashed lines (blue and orange) indicate two different comparison levels. Below the incoming sawtooth the two resulting comparator outputs (rectangle waves) and the two resulting shifted sawtooth waves are shown. It is not a "real" phase shift but an algebraic function. But the result is virtually the same. One could obtain the same function even with several comparator modules A-167 and mixers A-138a/b or polarizing mixers A-138c. But this would require a lot of modules.

The module has available four manual shift controls and four control voltage inputs with attenuators for the four internal shifting circuits. Typical sources for these inputs are LFOs, VCLFOs, random voltages, envelope generators, sequencers or other control voltage sources. Internally eight single outputs are available at single pins: the four shifted signals and in addition four rectangle outputs. A corresponding breakout module with eight sockets is in the planning stage and will be released provided that there are sufficient inquiries. The original signal and the four shifted signals are equipped with internal jumpers. If external toggle switches are used instead of the jumpers each of the 5 signals can be turned on/off individually.

The audio input is equipped with an attenuator to adjust the level for the right summation of the original and the comparator signals (as described above).
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 2 in stock $78.18
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quote 716933
Cat: 716947 Rel: 29 Jan 19
 
Crossfader for two different A-100 signals, plus insert for external effects
Notes: The A-138d primarily is used for crossfading between two modular signals. On the other hand you can used it for inserting stompboxes or other effects into your modular system. Both the inputs and the mix output are available twice, like a mini-multiples e.g. for using the input signal also for other applications, kind of like a Thru.

Crossfader: With the crossfading control CF you blend manually between the inputs In 1 and In 2. The Mute switch allows for muting one of the two signals, independent on the crossfader position.

Effect insert: The signal at input In1 is emitted at the FX Send output and can be attenuated with the Atten. control because the modular system works with much higher levels.

The effect unit's output is inserted to the FX Return input socket and its level can be boosted with the Amp. control. The processed signal is available at the bottom in 2 socket.

Use the CF control to blend between the original signal and the effect signal and to mute switch for quick muting e.g. of the effect return signal.
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 1 in stock $68.54
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quote 716947
Cat: 716951 Rel: 29 Jan 19
 
19HP Eurorack module for attenuating, polarizing & crossfading audio or control signals
Notes: Module A-138e contains four identical units that can be used for different crossfading, mixing and polarizing applications:

Polarizer: only input A is used, inputs B and C are unconnected. In this case the sub-unit works as a polarizer. In the CCW position of the control the signal connected to input A appears at the output, in the CW position the inverted signal, in the centre position no signal appears at the output

Two-way Crossfader type 1: Two different signals are connected to the inputs A and C, switch is in the left position (switching contact of input B is open). In this case the sub-unit works as two-way crossfader between the two signals connected to the inputs A and C. In the centre position both signals appear with the same level.

Two-way attenuator: Two different signals are connected to the inputs A and C, switch is in the right position (switching contact of input B is connected to GND). In this case control is used to attenuate signal A (between CCW and centre position) or signal C (between centre and CW position). In the centre position no signal appears at the output. Similar to the two-way crossfader but without signal in the centre position.

Three-way Crossfader: Three different signals are connected to the inputs A, B and C. In this case the sub-unit works as three-way crossfader. In the CCW position only signal A appears at the output. Between CCW and centre position a mix of the signals A and B appears at the output. In the centre position only signal B appears at the output. Between centre and CW position a mix of signals B and C appears at the output. In the CW position only signal C appears at the output.

Two-way Crossfader/Polarizer type 2: Two different signals are connected to the inputs A and B. In the CCW position only signal A appears at the output. Between CCW and centre position a mix of the signals A and B appears at the output. In the centre position only signal B appears at the output. Between centre and CW position a mix of signals B and inverted signal A appears at the output. In the CW position only the inverted signal A appears at the output. Useful for CV mixing: e.g. signal A = ADSR, signal B = LFO. In this case one can fade between ADSR ... LFO + ADSR ... LFO ... LFO - ADSR ... - ADSR.

In addition, the inverted signal of input A is available as a separate output. Potentiometers with centre detent and centre terminal are used as controls.
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 1 in stock $83.53
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quote 716951
Cat: 731945 Rel: 10 Jun 19
 
Multi-featured mixer - 6HP
Notes: Module A-138i is a four channel mixer with an additional mute switch for each input. On top of that it is equipped with two types of single outputs and a dual mix output. All inputs and outputs are DC coupled. Consequently the VCAs can be used to mix both audio and control voltages.

Each input is - apart from the mute switch - equipped with the usual attenuator.

The single outputs offer the attenuated and possibly muted signal of the channel in question. Two version of single outputs are available:

Single Output A: If a plug is inserted into the single output "A" socket the channel in question is removed from the sum signal.

Single Output B: If a plug is inserted into the single output "B" socket the channel in question is not removed from the sum signal. This type of single outputs is available only for the channels 1 and 2.

The output is twice available (two sockets, hard-wired like a multiple).

The distances between the controls and sockets are smaller as for the standard A-100 modules and rubberized small-sized knobs are used. In return the front panel has 6 HP width only. The module is primarily planned for applications where only limited space is available.
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 2 in stock $77.11
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quote 731945
Cat: 731947 Rel: 10 Jun 19
 
Compact 4-channel mixer - 4HP
Notes: Module A-138n is a simple four channel mixer, which can be used with either control voltages or audio signals. Each of the four inputs has an attenuator available. The output is twice available (two sockets, hard-wired like a multiple).

The module is the slim version of module A-138a and offers nearly the same features. But the distances between the controls are smaller and rubberized small-sized knobs are used. In return the front panel has 4 HP only which is half the width of the A-138a. The module is primarily planned for applications where only limited space is available. The only functional difference compared to the A-138a is the missing attenuator for the (dual) output.
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 9 in stock $50.70
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quote 731947
Cat: 738616 Rel: 10 Jul 19
 
Stereo headphone amplifier - 6HP
Notes: The A-139-2 is a headphone amplifier module with two mono inputs and a stereo headphone output. It can be used for driving small loudspeakers, LED strips, small magnets etc.

- Two-channel headphone amplifier
- Two audio inputs with level controls
- Input 1 is normalled to Input 2
- Common loudness/master level control
- Headphone output (stereo 1/4" jack socket)
- Max. output power ~ 2 W per channel (@ 8 Ohm load)
- DC coupled inputs and outputs (i.e. also useful for other applications like small loudspeakers, lamps, LEDs, magnets, motors - provided that the power is sufficient)
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 1 in stock $52.47
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quote 738616
Cat: 738617 Rel: 10 Jul 19
 
Versatile module that can also be used as a modulation device - 8HP
Notes: Module A-140-1 is an envelope generator, and, since it puts out control voltages, counts as one of the modulation devices in a modular system. As soon as the gate input receives sufficient voltage, the ADSR generates a variable voltage, changing in time, called an envelope. This varying voltage is output in normal (positive) and inverted form, and can be used, eg. for voltage controlled modulation of a VCO, VCF, or VCA, or for processing other modules' inputs and outputs.

The shape of the envelope is governed by four parameters: Attack, Decay, Sustain and Release.

The envelope is started (triggered) by a gate signal either from the INT.GATE voltage on the system bus, or, if a signal is put into it, from the gate input socket.

The envelope can also be re-triggered, i.e. start from scratch again, each time a trigger signal is sensed at the Retrig. input socket, when the gate is still open.

Module A-140 has available a three-position toggle switch to select one of three time ranges. The time ratios for the three ranges are about 1 : 20 : 1000. The absolute Attack times are about:

20uS ... 100ms (switch position L)
400uS ... 2s (switch position M)
20ms ... 120s (switch position H)
The Decay and Release times are about 3-4 times more. Because of the exponential slope and the gradual asymptotic approach to the zero level the exact specification of the decay and real times is a bit difficult.

The voltage ranges of the ADSR outputs are about 0 ... +8V for the two normal outputs and 0 ... -8V for the inverted output.

In combination with the Comparator module A-167 a free-running "ADSR-LFO" can be realized.
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 2 in stock $76.04
Cat: 738621 Rel: 10 Jul 19
 
Voltage controlled envelope generator with decay parameter - 8HP
Notes: Module A-142-1 is a voltage controlled envelope generator. The only time parameter is decay (like TB303). Decay may be adjusted manually and via voltage control input (with attenuator). The envelope output is displayed with LED control. Additionally from the envelope signal a Gate signal and an inverse Gate signal with adjustable threshold is derived. LED control for Gate output. Thus one obtains a voltage controlled Gate additionally or alternatively to the envelope signal with voltage controlled duration.

The attack time is fixed to about 0.2 ms, the shortest decay time is about 2 ms. By changing the value of a capacitor the shortest time can be modified (details can be found here: A100_Capacitors.htm).

Typical applications: dynamic control of decay e.g. in combination with the Analog/Trigger Sequencer A-155, voltage controlled trigger delay functions (like A-162, but voltage controlled).
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 1 in stock $79.25
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quote 738621
Cat: 738640 Rel: 09 Jul 19
 
Voltage controlled sine-LFO with four separate, phase shifted outputs - 8HP
Notes: Module A-143-9 is a derivative of our planned thru-zero quadrature VCO. It is a voltage controlled sine LFO with 4 outputs. The phase shift between the outputs is 90 degrees. The sine shifted by 90 degrees is also called cosine, the sine shifted by 180 degrees is nothing but the inverted sine, and the sine by 90 degrees is nothing but the inverted cosine.

The frequency range is from some minutes to frequencies beyond audio with three ranges selected by a toggle switch:

- Switch position H: about 30 Hz ... 3.5 kHz with the manual frequency control ("Frq."), beyond 20 kHz with additional external CV
- Switch position M: about 1 Hz ... 150 Hz with the manual frequency control ("Frq.")
- Switch position L: about 0,1 Hz ... 10 Hz with the manual frequency control ("Frq."), down to several minutes with additional external CV

Two exponential frequency control inputs are available: CV1 without attenuator and CV2 with polarizer. Consequently the module can be used even as an experimental sine VCO but does not feature an exact 1V/oct CV input! The precision CV input will be left to the thru-zero quadrature VCO.

Two LEDs display the positive and negative share of the sine output.

The core of the module is a so-called quadrature circuit that generates a sine a cosine signal with very low distortion. The quality of the sine/cosine signals are much better than those generated by a waveform converter with a sawtooth or triangle signal as starting point.

The output levels are about 5 Vss (+/-2.5V) but can be adjusted internally by a trimming potentiometer (P5 "Shape").

Typical applications:

- External sine/cosine oscillator for the frequency shifter A-126
- Modulations with pure sine/cosine waveforms
- Quadrature/barberpole effects (e.g. with the voltage controlled mixer A-135)
- Experimental sine/cosine VCO (e.g. for FM sounds)

Many users suggested to add a common output level control, i.e. four VCAs with one common control (manual + CV without attenuator + CV with polarizer) for the output levels. This is why we also designed the Quad VCA module A-132-2 with the possibility of an internal default connection to the four outputs of the A-143-9 (no soldering required, short 10 pin flat cable with removable connectors on both ends).

The A-143-9 is also a meaningful addition for the Frequency Shifter module A-126. It enables frequency shifting even below 50 Hz generating e.g. these mellow beat sounds with a few Hz frequency shifting only. The following document describes how to connect the A-126 and the A-143-9: A126_A143_connection.pdf.

The thru zero version of the A-143-9 with temperature compensation is the module A-110-4.
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 1 in stock $78.18
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quote 738640
Cat: 577770 Rel: 06 Jun 19
 
Low frequency oscillator featuring 5 different waveforms - 8HP
Notes: Module A-145 is a low frequency oscillator, which produces cyclical control voltages in a very wide range of frequencies. Five waveforms are available: sawtooth, inverted sawtooth, triangle, sine and square wave.

The LFO can be used as a modulation source for any number of modules - for instance modulating the pulse width or frequency of a VCO, modulation of the cut-off frequency of a VCF, or amplitude modulation with a VCA.

A three-way switch lets you select three frequency ranges, spanning from one cycle every several minutes at the lowest, to moderate audio frequency at the highest (about 4-5 kHz).

The LFO signal can also be synchronised, via the reset input.
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quote 577770
Cat: 731949 Rel: 10 Jun 19
 
Quad low frequency oscillator - 4HP
Notes: Module A-145-4 is a simple quad LFO (Low Frequency Oscillator). Not a very "exciting" module, just a bread-and-butter device and a simple demon for work. Virtually in every modular system several LFOs are required for modulation purposes. The module contains four simple LFOs with the waveforms triangle and rectangle. A dual colour LED (red = positive / yellow = negative output voltage) indicates the triangle output of each LFO. The frequency range can be chosen for each LFO individually by means of a jumper between about 50 Hz ... 0.04 Hz (about 20 seconds, jumper removed) and about 2Hz ... 0.002 (about 8 minutes, jumper installed).

The module can be treated as a slimmed version of the quad LFO A-143-3 as it has similar features available. But the distances between the controls are smaller and rubberized small-sized knobs are used. In return the front panel has 4 HP only which is less than one third of the A-143-3. The module is primarily planned for applications where only limited space is available. The functional difference compared to the A-143-3 are the missing sawtooth outputs and frequency range switches.
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quote 731949
Cat: 738645 Rel: 10 Jul 19
 
Low frequency oscillator with adjustable waveform - 8HP
Notes: Module A-146 (LFO 2) is a Low Frequency Oscillator, which produces periodic control voltages over a wide range of frequencies.

The LFO can be used as a modulation source for a series of modules (for instance pulse width and/or frequency modulation of a VCO, modulation of a VCF cut-off frequency, amplitude modulation with a VCA).

Three outputs are available, with different waveforms: sawtooth / triangle; square wave, and positive-voltage square wave.

The waveform is continuously adjustable from rising sawtooth, through triangle to falling sawtooth. The same control affects the pulse width of the square wave.

A three-way switch can select one of three frequency ranges, spanning from one cycle every few minutes, at the lowest, up to audio frequency at the highest.
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quote 738645
Cat: 745775 Rel: 10 Sep 19
 
Two sample & hold units in one module for generating stepped random voltages or slicing signals
Notes: Module A-148 (Dual S&H) has two identical sample & hold modules, designed to produce 'staircase' voltages. The signal present at the sample input is sampled at a rate set by the signal at the trigger input, and held at that voltage at the S&H output.

The exact shape of the staircase depends on the sort of waveform at the sample input: NOISE or RANDOM signals produce random patterns; an LFO produces rising or falling staircase patterns.

Two LEDs for each S&H indicate the voltage (positive or negative) of the sampled signal.
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quote 745775
Cat: 745777 Rel: 10 Sep 19
 
Expansion module to the A-149-1
Notes: A-149-2 is an extension module for A-149-1. It makes available 8 digital random voltages (i.e. only low/high states like a gate signal). The outputs are controlled by the "Quantized Random Voltages" section of the assigned A-149-1 and correspond to the 8 digital outputs of the shift register that is used to generate the Quantized Random Voltages. As the alteration of the A-149-2 outputs is clock controlled by the Clk In of the "Quantized Random Voltages" section of the A-149-1 the A-149-2 can be used to create random rhythmical sequences.

The A-149-2 requires the A-149-1 and has to be mounted directly to the left or right of the A-149-1 as an internal ribbon cable connection has to be established between A-149-1 and A-149-2.
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quote 745777
Cat: 745778 Rel: 10 Sep 19
 
Two independent voltage controlled switches in one module - 4HP
Notes: Module A-150-1 (Dual VCS) contains two separate voltage-controlled switches.

Each switch has a control voltage input, a common Out / Input, and two In / Outputs. The switches are bi-directional: they can work in both directions, so can connect one input to either of two outputs, or either of two inputs to one output. Voltages in the range -8V...+8V at the O/I resp. I/O sockets can be processed by the module.

Two LEDs show which in / output is active (i.e. which is connected to the common out / input).
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quote 745778
Cat: 745787 Rel: 10 Sep 19
 
Voltage-controlled clock multiplier with CV or manual control - 4HP
Notes: Module A-160-5 is a voltage controlled clock multiplier. The incoming clock signal (socket Clock In) is multiplied by a factor that depends upon the control voltage on socket CV In (0...+5V) and the position of the Mode switch. The multiplied clock signal is available at the socket Clock Out. According to the position of the Mode switch different clock multiplying factors are assigned to the control voltage. With 0V CV no clock output is generated. This state is indicated by "all LEDs off". With increasing CV integer factors (left position of the mode switch), power of two factors (middle position) or a mix of both (right position) are obtained. Nine LEDs are used to show the currently selected multiplying factor. In addition two LEDs are used to display the incoming and outgoing clock signal.

A manual control is used to adjust the clock multiplication factor manually without the need of an external control voltage. The voltage generated by this control ("Manual") is normalled to the CV In socket. As long as no plug is inserted into the CV In socket the clock multiplication factor is adjusted by means of the manual control knob and displayed by the LEDs. For dynamic applications (like the ratcheting function described below) the manually generated CV is overwritten by the external CV which has to be fed into the CV In socket.

The module can be used for all kind of clock multiplying applications. One important example is the generation of so-called ratcheting sequences. The band Tangerine Dream is famous for this kind of sequences. A normal sequencer generates only one gate signal per step. A ratcheting sequence may have also more than one gate pulses per step. This function can be obtained by using the A-160-5: one CV output of the sequencer is used to define the number of gate pulses per step. If the control of the step in question is fully CCW the generated CV is 0V and no gate signal is generated (mute of the step). When the control of the step in question is turned clockwise one, two or more gate pulses are generated depending upon the position of the mode switch and the voltage generated by the CV at this step.

Technical note: Due to the nature of clock multiplying it takes a few input clock pulses until the clock output is stable. One has to average a few input clock pulses to generate the multiplied clock output signal. Even when the input clock frequency changes it will take a few cycles until the output clock signal is correct as the module cannot foresee the future of the clock input signal. The generated clock output signal is derived from the last few cycles of the clock input signal. Consequently the module should be driven only by a clock signal with constant or slowly changing frequency.
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quote 745787
Cat: 577759 Rel: 10 Sep 19
 
Additional 4HP module for the A-160
Notes: Module A-161 is an eight-step Clock Sequencer which is internally connected to the Clock Divider (A-160). Eight outputs are sequentially switched by the clock signals from the A-160 (see Fig. 1) and can act, for instance, as sequential rhythmic triggers for an envelope. The reset on the A-160 also works on the A-161 (instant return to Step 1). The low/high levels of the output signals are 0V and about +10V. In combination with a mixer (A-138) short analogue sequences can be generated. Our MIDI-Analog-Sequencer MAQ16/3 is suitable for MIDI-controlled analogue sequences up to 48 steps. A "real" analogue sequencer with 8 steps is the A-155.
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quote 577759
Cat: 745790 Rel: 10 Sep 19
 
8HP dual trigger delay for Eurorack
Notes: Module A-162 contains two identical circuits that generate a trigger signal with adjustable delay and length from an incoming rectangle signal (e.g. gate, trigger, rectangle output of an LFO or VCO). The rising edge of the incoming signal is used to trigger the new trigger signal. This module makes it possible to delay the onset of a trigger pulse, and also change its length.

On each of the two units, two controls can alter the onset time and duration of triggers, from about 2 ms up to more than 10 seconds. A control LED shows the generated signal.
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quote 745790
Cat: 745791 Rel: 10 Sep 19
 
Simple & effective voltage-controlled frequency divider - 8HP
Notes: Module A-163 is a voltage controlled audio frequency divider. The frequency of the input signal (preferably the rectangle output of a VCO) is divided by an integer factor N (N = 1, 2, 3, 4 ... up to 32). N can be adjusted manually and modulated with an external control voltage (e.g. from LFO, ADSR, Random, MIDI-to-CV, Theremin, Light-to-CV, analogue sequencer) with attenuator. The control input has polarizing function, i.e. the manually adjusted dividing factor can be modulated upwards or downwards. The basic idea of a polarizer is described in the modules A-133 Voltage Controlled Polarizer and A-138c Polarizing Mixer.

The output waveform is rectangle with 50% duty cycle. Unlike the A-115 with fixed dividing factors (2, 4, 8, 16) the dividing factor of the A-163 is voltage controlled and can be any integer value between 1 and about 20 (but only one output). In contrast to A-113 the dividing factor of the A-163 is voltage controlled and the output waveform is rectangle (the A-113 has 4 sawtooth outputs with 4 adjustable but not voltage controlled dividers).
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quote 745791
Cat: 745792 Rel: 10 Sep 19
 
Dual trigger modifier, consisting of two trigger inverters for gate, clock or trigger signals - 4HP
Notes: Module A-165 (Dual Trigger Modifier) contains two separate trigger modifiers, to use with logical/digital levels (gate, clock, trigger). Each half of the module enables signals generated by the A-100 to communicate with other instruments (such as an external sequencer) or is simply used where you want to reverse a trigger polarity.

Whatever signal is patched into the input, inverted by the module, and fed out of the Inv. Out (inverted output) socket. At the same time, a trigger signal of roughly 50 ms is generated every time an edge of the trigger pulse is sensed (negative as well as positive). This trigger signal is available at the +/- output.

Two LEDs act as indicators showing the level of signal available at the two outputs.

When both units are daisy-chained the module can be used as level shifter for gate/trigger/clock signals (from min. +2,5V up to +12V)
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quote 745792
Cat: 751699 Rel: 23 Oct 19
 
Two separate slew limiters for generating portamento effects - 8HP
Notes: Module A-170 contains two separate slew limiters, also known as portamento controllers or integrators. The first SL has just one joint control, which sets both rise and fall times (c. 0 ...10 sec). The second SL has separate controls for rise and fall times, and can therefore be used as a simple AR envelope generator. Over and above this, you can set the overall range for these parameters, with a three-position switch, as on the full ADSRs.

Both slew limiters have two LEDs each, to show the state of the rising and falling voltages.


Additional technical remarks: If the upper slew limiter is used for precision applications (e.g. portamento/glide of one or more VCOs) a buffer (e.g. A-185-1 or A-185-2) is recommended between the A-170 output and the VCO(s) input(s). The reason is a small voltage drop that is caused by the protection resistor at the A-170 output. An A-185-1 or A-185-2 connected between the A-170 and the VCO(s) avoids that voltage loss. For all A-170 manufactured later than May 2009 (recognizable by the label "Version 2" on the pc board) this remark is not valid as these modules are equipped with an additional voltage buffer at the output.

The lower slew limiter cannot be used for precision applications because of the voltage loss caused by the diodes of the circuit.
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quote 751699
Cat: 751702 Rel: 23 Oct 19
 
Two separate slew limiters for generating portamento effects - 8HP
Notes: Module A-170 contains two separate slew limiters, also known as portamento controllers or integrators. The first SL has just one joint control, which sets both rise and fall times (c. 0 ...10 sec). The second SL has separate controls for rise and fall times, and can therefore be used as a simple AR envelope generator. Over and above this, you can set the overall range for these parameters, with a three-position switch, as on the full ADSRs.

Both slew limiters have two LEDs each, to show the state of the rising and falling voltages.


Additional technical remarks: If the upper slew limiter is used for precision applications (e.g. portamento/glide of one or more VCOs) a buffer (e.g. A-185-1 or A-185-2) is recommended between the A-170 output and the VCO(s) input(s). The reason is a small voltage drop that is caused by the protection resistor at the A-170 output. An A-185-1 or A-185-2 connected between the A-170 and the VCO(s) avoids that voltage loss. For all A-170 manufactured later than May 2009 (recognizable by the label "Version 2" on the pc board) this remark is not valid as these modules are equipped with an additional voltage buffer at the output.

The lower slew limiter cannot be used for precision applications because of the voltage loss caused by the diodes of the circuit.
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quote 751702
Cat: 751706 Rel: 23 Oct 19
 
Module for processing/mixing of control voltages - 4HP
Notes: A-172 is a minimum/maximum selector module and is equipped with four analogue inputs and two analogue outputs (minimum, maximum). The main application of the module is the processing/mixing of control voltages, e.g. random voltages, ADSR, LFO, S&H, ribbon CV, theremin-CV and similar, but even for audio signal processing the module can be used (e.g. several outputs of the same or different VCOs).

The module permanently picks the maximum resp. minimum voltage out of the four input signals and outputs these voltages to the maximum resp. minimum jack socket.

To adjust offset and amplitude for each input independently (i.e. to bring the signal into the right "position" with the desired level) we recommend combining the module with the A-129-3 Slew Limiter/Attenuator/Offset Generator (see patch example below). The other sketch below shows the basic principle of the max/min module by means of three sine waves (e.g. three LFOs) with different frequencies and different levels.

The module can be used also as a simple half-wave rectifier.
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quote 751706
Cat: 751707 Rel: 23 Oct 19
 
Modulation wheel module with two wheels - 14HP
Notes: A-174-2 is a modulation wheel module with two wheels. The factory setting is a spring loaded wheel at the left side with bipolar voltage output (i.e. 0V in centre position, positive voltage in the upper range, negative voltage in the lower range, voltage range about -5.5 V ... 0V ... +5.5 V) and a wheel without spring at the right side with positive voltage output (i.e. 0V in the lowest position and positive voltage when operated, voltage range about 0...+8 V). For the spring loaded wheel a voltage "plateau" around 0 V is preset (jumper) so that the output voltage is 0 V in a small area near the centre position.

By means of jumpers the factory settings can be changed. For each wheel two jumpers are available: one for the voltage range (positive or bipolar) and one for the voltage plateau around 0 V. If these settings are changed even the wheels have to be re-adjusted mechanically. Therefore, such modifications should be carried out by a qualified person only. By request the module is available from the factory even with two wheels both with or without springs (additional charges Euro 10.00 for each change).

Important note for module mounting: As the potentiometer of the left wheel projects about 10 mm the rim of the front panel a 2 or 4 HP blind panel has to be mounted left from the module - unless the module left to the A-174-1 has sufficient space in this area (e.g. A-174-1).
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quote 751707
Cat: 751709 Rel: 23 Oct 19
 
Two identical inverters - 4HP
Notes: Module A-175 (Dual Voltage Inverter) is exactly what it says it is: two identical inverters, which will take a voltage and output it in an inverted form - so that an input of +5 V will be output as -5 V, an input of -2 V will be output as +2 V, and so on. Two LEDs give a visual indication of the (positive or negative) output signal.
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quote 751709
Cat: 751715 Rel: 23 Oct 19
 
Foot controller interface - 8HP
Notes: Economically priced module for connecting one foot controller and one double foot switch for control A-100 functions by means of the feet. For example, the frequency of a filter or the loudness can be controlled by a foot controller, but even other parameters like LFO frequency, modulation depth, phasing, pitch or any other voltage controlled parameter. The gate outputs controlled by the double foot switch can be used e.g. to trigger an envelope generator or to start/stop a sequencer. Even a single foot switch can be used if only one gate signal is required.

A special application of the A-177-2 is the usage within a Trautonium replica. The foot switches can be used to switch the mixtures of the subharmonic oscillator A-113. The foot controller can be used to control the overall loudness in combination with a VCA.

A-177 is compatible with the foot controllers FP5 and double foot switch VFP2. The Foot controller and double foot switch are not included with the module. If you want to use another foot controller or foot switch it has to be compatible to FP5 or VFP2.

If the foot controller FP5 is used the CV output range is about 0...+8V. The gate output levels are 0/+12V in combination with the VFP2 (foot switch not operated = 0V, foot switch operated = +12V).
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quote 751715
Cat: 751716 Rel: 23 Oct 19
 
Theremin controller module - 8HP
Notes: Theremin module for generating a variable control voltage by approaching/removing hand to/from an antenna. The distance range is about 30-40 cm. Additionally the module is equipped with a Gate output with adjustable threshold level. Controls/Inputs/Outputs: antenna input, offset (knob for zero adjust), 2 x CV out, 2 x LED (for CV control positive/negative and zero offset adjust).

To simulate the original Theremin two A-178, a VCO (e.g. A-110) and a linear VCA (e.g. A-130 or A-132) are required. But of course the A-178 can be used to control other functions in the A-100 (e.g. filter frequency, modulation depth and/or speed, tempo, attack/decay time and so on).

The CV output voltage of the A-178 can range - according to the setting of the front panel controls - from -10V...+10V. The gate output switches from 0V to about +10V.

Applications:

- Controlling any voltage controlled parameter of the A-100, e.g. pitch or pulsewidth (VCO A-110), loudness (VCA A-130/131/132), panorama (A-134), filter frequency or resonance (A-120/121/122/123), phasing (A-125), frequency shift (A-126), resonance peaks (A-127), envelope parameters (A-141/142), tempo (A-147)

- Triggering of A-100 activities via gate with adjustable threshold, e.g. starting an envelope (A-140/141/142), Start/Stop of a sequence (A-155), any switching function (A-150/151)

- Conversion into MIDI control change messages is possible with the A-192.

If two or more A-178 are used the distance between the modules/antennas should be at least 40-50 cm. Otherwise the antennas may affect each other.
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quote 751716
Cat: 714707 Rel: 22 Jan 19
 
4HP Eurorack module consisting of four buffer circuits for control voltages
Notes: Module A-180-4 is a fourfold CV buffer. Buffers are required if the control voltage coming from a CV source shows a voltage drop in case of changing loads or due to other reasons a buffering is required.

For the lower three units the input is normalled to the output of the above unit. That way the module can work as 1-in-4 buffered multiple provided that no signals are applied to the inputs of the three lower units.

Typical applications:

- Buffering the outputs of voltage controlled switches (e.g. A-150-1, A-150-8, A-151, A-152). Comment: in case of bidirectional switches it's not possible to integrate the buffers into the switching module because the direction is not known (i.e. which terminal of the switch is working as input and which as output). All electronic switches suffer from a small residual restistance that may cause a small voltage drop without buffering. This may become a problem especially when VCOs are controlled by the switched voltages.
- Buffering of CV interfaces, quantizers, slew limiter, S&H/T&H, sequencer etc. when VCOs are controlled by the CV (provided that the module in question does not feature a buffered output)
- Buffered multiple (similar to A-180-3)
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quote 714707
Cat: 751722 Rel: 23 Oct 19
 
Two multiples with one 1/4 jack socket & two 3.5mm jack sockets each
Notes: Doepfer's A-181 Multiples 2 is a simple multiple and cable format converter, suitable for translating 1/4" signals to 1/8" and vice versa. The upper mult is wired for monophonic signals, while the lower mult features a 1/4" stereo connector which offers direct 1/8" connection to the tip and ring, respectively, allowing use as a stereo splitter or dual 1/8" to stereo 1/4" converter.
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quote 751722
Cat: 731951 Rel: 11 Jun 19
 
Quad passive switch - 4HP
Notes: A-182-2 is a simple passive module that contains four changeover switches, which are used to connect or disconnect the sockets of the corresponding socket triplet:

- In the upper position of the switch the upper socket of the corresponding socket triplet is connected to the centre socket
- In the lower position of the switch the lower socket of the corresponding socket triplet is connected to the centre socket
- In the centre position of the switch the sockets are not connected

Each unit of the module can be used to switch between two signals or to interrupt/connect a signal. In the last case the third socket of the triplet is not used.

The module is fully passive and both audio or control signals can be switched.
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quote 731951
Cat: 711015 Rel: 29 Nov 18
 
Simple power supply for up to four devices - 2HP
Notes: Module A-183-9 is a simple power supply for up to four devices which can be powered via USB (e.g. keyboards, smartphones). An LED shows is the +5V are present.

The module has no USB function but provides only the +5V supply for USB devices.

A control LED shows if the +5V are present.

Note: The module requires an A-100 case with built in power supply A-100PSU3. Only this A-100 supply has the required +5V available. We do not recommend the usage of an older A-100 case with A-100PSU2 as this would require the +5V adapter A-100AD5 and the max. current would be limited to 100mA.
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quote 711015
Cat: 751756 Rel: 23 Oct 19
 
4HP Eurorack module featuring a combination of 3 functions
Notes: Module A-184-1 is the combination of three functions:

- Ring Modulator
- Sample&Hold/Track&Hold unit
- Slew Limiter

The same functions are actually already available in other modules (e.g. A-114, A-148, A-170). But in many systems it's not necessary to have two ring modulators (A-114) or two S&H units (A-148) or two slew limiters (A-170) available. That's why we have compiled these function in one small 4 HP module.

The upper section is nothing but half of an A-114, i.e. a ring modulator with the usual X/Y inputs and the X*Y output. Inputs and outputs of this sub-unit are AC coupled, i.e. suitable only for audio signals. A detailed explanation of a ring modulator can be found on the A-114 info page.

The lower section is a Sample & Hold (S&H) / Track & Hold (T&H) unit (same as half of an A-148) followed by a slew limiter (same as the upper section the A-170). A toggle switch is used to set the mode to S&H or T&H. In S&H mode the unit picks out a sample from the voltage at the SH input at the rising edge of the trigger signal input. In T&H mode the output follows the input voltage as long as the level of the trigger signal is high. As soon as the trigger signal turns low, the last voltage is stored. The trigger input is internally normalled to high, i.e. the unit works just as a slew limiter in T&H mode when no trigger signal is applied.
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quote 751756
Cat: 751758 Rel: 23 Oct 19
 
Sine converter/VC crossfader - 4HP
Notes: Module A-184-2 is the combination of two functions and planned primarily as an expansion module for VCOs or LFOs (e.g. A-110-1, A-110-2, A-145, A-147-2).

Triangle-to-Sine Waveshaper:

The upper section is a very precise triangle-to-sine converter (thanks to Tim Stinchcombe who recommended this circuit). It can be used to convert any triangle waveform into a (nearly) perfect sine. The converter is much better than the simple diode converter used in the A-110-1, A-111-1, A-145 and A-147-2. Two trimming potentiometers are used to optimize the sine shape. The converter should be assigned to one VCO or LFO because the trimming potentiometers have to be re-adjusted if the input level or DC offset of the input signal changes. If the trimming potentiometers are deliberately mis-adjusted it can be used also as a waveshaper for non-sine waveforms (e.g. sine-shaped at the top of the signal and a peak at the bottom, even voltage controlled by applying an additional voltage to the waveshaping circuit, "circuit-bending" notes will be available).

The waveform converter is DC coupled and can be used also for low frequencies (e.g. LFO triangle waves).

Voltage Controlled Crossfader:

The lower section is a voltage controlled crossfader. It has two inputs A and B. The two signals are mixed together with variable percentage. When the manual control CF is fully CCW only signal A appears at the CF Out socket. When the manual control CF is fully CW only signal B appears at the CF Out socket. In the centre position of the manual control both signal appear with the same level. In addition a control voltage input CV with attenuator is available to enable voltage control of the crossfade.

Two LEDs display the crossfading shares of input A and B.

The crossfader uses two high quality VCAs (SSM2164). Inputs and outputs are DC coupled. Consequently it can be used for audio signals and slowly varying control voltages as well.

The sockets of the upper section (triangle and sine) are normalled to the inputs A and B of the crossfader section. That way the crossfader is used to fade between triangle and sine of the VCO or LFO connected to the waveshaper. If other signals are plugged into the input sockets A and B these signals are used for crossfading.

The main application is to fade between two different waveforms of a VCO or LFO or two different VCF outputs. But the module can be used for any other signals too as the waveshaper and crossfader sections are independent apart from the normalled sockets.
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quote 751758
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