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== History ==
[[File:CGS photo jan 2002.jpg|thumb|right|500px|Ken Stone's synth as it was in Jan 2002]]
The CGS web page chronicled and supplied details of the construction of Ken's own modular synthesizer. The site itself was simply titled "Modular Synth". After other parties started referring to it as the "Catgirl Synth", Ken adopted the letters CGS as identifiers on his PCB designs.<ref>[https://web.archive.org/web/20030407200638/http://cgs.synth.net/ 1999], CGS - archived</ref><ref name="ks">Information provided by Ken Stone.</ref>
The web page first came online in
== Format ==
CGS is based around the [[4U]] format, with +/-15 volts supplied via [[MTA connector|0.156 4 pin MTA]] connectors and either [[Connectors|banana sockets or 3.5mm jacks]].<ref>{{Cite web |url=http://www.elby-designs.com/webtek/cgs/parts_faq.html |title=CGS parts FAQ |accessdate=2018-10-07 |archiveurl=https://web.archive.org/web/20161105181508/http://www.elby-designs.com/webtek/cgs/parts_faq.html |archivedate=2016-11-05 |
== Building a DIY synthesizer ==
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== The CGS modules ==
[[File:cgs panel gate sequencer.jpg|thumb|right|The panel after which CGS was named.]]
These designs are for advanced builders and experimenters. They have been built and they have worked satisfactorily. Obviously only very few from the the variety of available component brands have been tried in each design. This is Ken's hobby and he has shared what he has done with other interested parties.<ref name="help">''[https://web.archive.org/web/20170420052751/http://www.cgs.synth.net/help.html Please read this before attempting to build anything from these pages.]''
=== CV processors ===
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:The Serge noise module can be built in several ways. In it's simplest form, it contains three basic outputs, white noise, pink noise, and a random voltage suitable for use with sample and hold modules. An optional sample and hold circuit is included on the PCB. Alternatively, the basic version may be coupled with the [[CGS Serge smooth and stepped generator|CGS92 Serge Smooth and Stepped Generator]] to make the Random Voltage Generator module.
* <!-- cgs92_ssg.html -->CGS92 [[CGS Serge smooth and stepped generator|Serge Smooth and Stepped Generator]]
* <s><!-- cgsssg_ssg.html -->CGSSSG [[CGS Serge smooth and stepped generator (previous version)|Serge Smooth and Stepped Generator (previous version)]]</s>
:The Serge Smooth and Stepped Function Generator (SSG) is a complex multi-functional module to provide various slew and sample functions.
* <!-- cgs86_trk.html -->CGS86 [[CGS touch responsive keyboard|Touch Responsive Keyboard]]
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* <!-- cgs77_vcf.html -->CGS77 [[CGS Serge 1973 voltage controlled filter|Serge 1973 Voltage Controlled Filter]]
:This is an adaptation of the original Serge VCF from the early "R" series PCBs. Produced under licence from Serge.
* <!--
:This module is a variation on the Serge Quad Voltage Controlled Amplifier (QVCA) module, built using the CGS108 VCA.
* <!-- cgs101_dcsm.html -->CGS101 [[CGS Serge dual channel stereo mixer|Serge Dual Channel Stereo Mixer]] (DCSM).
:This module is a variation of the Serge Dual Channel Stereo Mixer, built using the CGS108 VCA and the CGS102 Equal Power Panner drivers. Produced under licence from Serge.
* <!-- cgs102_epp.html -->CGS102 [[CGS Serge equal power panner|Serge Equal Power Panner]]
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=== Other original designs ===
* <!-- comparator.html -->[[CGS gated comparator]]
* <!-- gate_sequencer.html -->[[CGS gate sequencer]]
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* <!-- v8sim.html -->[[CGS V8 and diesel simulators]]
===
* <!--
* <!-- ts21.html --> [[Audio synthesis via vacuum tubes/Metasonix TS-21 hellfire modulator|Metasonix TS-21 hellfire modulator]]
* <!-- ts22.html --> [[Audio synthesis via vacuum tubes/Metasonix TS-22 pentode filterbank|Metasonix TS-22 pentode filterbank]]
* <!-- ts23.html --> [[Audio synthesis via vacuum tubes/Metasonix TS-23 dual VCO|Metasonix TS-23 dual VCO]]
* <!-- vca.html -->[[CGS mixer and ETI 4600 VCA]]
* <!-- motm100.html -->[[CGS MOTM 101 noise, S&H and vibrato]]
▲* <!-- rhythm.html -->[[CGS Welson Festival 2000 drum simulator]]
* <!-- vocal_filter.html -->[[CGS Roland VP300 vocal filter]]
* <!--
* <!--
=== Tube modules ===
* <!-- tubevcf.html -->[[CGS tube bandpass VCF]]
* <!-- tube_psu.html -->[[CGS tube module power supply]]
* <!-- noise.html -->[[CGS tube noise source]]
* <!-- tubevco.html -->[[CGS tube VCO]]
▲* <!-- tubevcf.html -->[[CGS tube bandpass VCF]]
▲* <!-- ../tube/beam.html -->[[CGS tube beam modulator]]
▲* <!-- 6bn6.html -->[[CGS beam modulator]]
▲* <!-- programmer.html -->[[CGS sequencer programmer]]
* [https://www.schmitzbits.de/vtvcf.html René Schmitz VCF]
<ref>''[https://web.archive.org/web/20180209234644fw_/http://www.cgs.synth.net:80/modules/index.html Modules and how to build them.]''
== See also ==
* [[CGS parts FAQ]]
* [[CGS simple transistor matching guide]]
* [[Audio synthesis via vacuum tubes]]
== References ==
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== External links ==
* [https://web.archive.org/web/20170430151727/http://cgs.synth.net/ "Modular Synth", the CGS web site] on Archive.org
* [http://www.synthpanel.com/ "Modular Synth", the CGS web site] on synthpanel.com
* [http://electro-music.com/forum/index.php?f=165 Ken Stone designs - CGS] forum at electro-music.com
* [https://web.archive.org/web/20160608101311/http://www.serge.synth.net/ Serge Modular Music Systems], Ken Stone's historic Serge Modular web site
=== PCBs, kits and ready made CGS modules ===
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