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CGS31

Digital Noise Module

Courtesy/Thanks to: Ken Stone (CGS)

Description: From the CGS site:
This module is a very standard pseudo-random digital noise source with a few enhancements. Instead of running a fixed high frequency clock, a VCO is used instead, allowing for unusual sweeps, and for reducing the speed right down to a series of random pulses. The internal linear VCO can also be bypassed so an external source such as a 1V/oct VCO or LFO can be substituted. It has pink and white noise outputs, and two separate (unique) digital outputs for use in triggering other circuits.

Videos

Video: CGS31 triggers a sequencer

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Files
photo_cgs31v12_digital_noise.jpg
   Picture of an assembled CGS31 Digital Noise Module, newer version with onboard mixer and power distr
schem_cgs31v12_noise.gif
   Schematics for the noise part of CGS31 Digital Noise Module
schem_cgs31_v12_noise_mixer.gif
   Schematics for the mixer part of CGS31 Digital Noise Module
Links
electro-music.com/forum/post-308284
   Electromusic forum thread about CGS Digital Noise (using a CD4006). A large discussion on wh
www.cgs.synth.net/modules/cgs31_dig
   Link to the product page for the CGS31 on the CGS website. Full assembly plan, and a discussion on h
Parts used
1N4148
   High speed Switching Diode
TL072
   Low-Noise JFet-input Operational Amplifier
BC547
   1411
CD4046
   Micropower Phase-Locked Loop
HEF4070
   Quadruple exclusive-OR gat
HEF4006
   18-stage static shift register
Videos