Frequency Central

Notes: Chris Huggett, chief designer at EDP came up with a novel little circuit for the filter envelope of the Wasp, based around half a CD4013, half a CD4066 and half a LM3900. It was an A/R generator with looping option which would proceed through its whole cycle from only a trigger input. He further developed the circuit for the filter envelope in the Gnat to use just one knob to provide a range of attack envelopes when anti-clockwise (from 12 o'clock), and a range of release envelopes when clockwise (from 12 o'clock). 12 o'clock gives a very short symmetrical blip. As you can build two of these with a CD4013, CD4066 and LM3900, Frequency Central have provided both a two knob version and a one knob version, each has its own place.

Both envelope outputs are 0V to 5V.
All Q and not-Q outputs are 0V to 8V
Upper section cycle times: 23Hz to 20 seconds
Lower section cycle times: 8Hz to 10 seconds

Product Specifications:

Depth: 39mm
Width: 8HP
12V draw: 30mA
-12V draw: 0mA
5V draw: 0mA