Frequency Central SILICON HEAVEN Quick Start Manual

Frequency central
Silicon heaven
2 x one-shot/cyclic event generators based on CMOS envelopes used in EDP
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). As you can build two of
these with a CD4013, CD4066 and LM3900, we've provide both a two knob version and a
one knob version, each has it's own place.
We have re-engineered these ideas for Eurorack, and added a couple of useful features:
• As both circuits are based around flip-flop, we've provided Q outputs and not-Q
binary outputs (ie. either low or high). Q describes the attack cycle, whereas not-Q
describes the release cycle on both envelopes. There are numerous applications for
these outputs.
• The Gnat A/R did not have a looping function – we've added that as it's a useful
extra.
• We've included a Go! Button, which manually actuates both envelopes.
Build documentation for:
Wasp and Gnat