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Line 1: <!-- file missing [[File:cgs_photo_cgs04r2_mix.jpg\|center\|px]] --> ~~<!-- missing cgs_photo_cgs04r2_mix.jpg -->~~'''CGS04''' the '''CGS DC mixer''' project arose out of a need for a small mixer that preserved the DC component of signals, at audio frequencies and below, specifically for the hobbyist synthesizer builder, though it's applications do not stop there. Its compact size means it can easily be included along with other circuit boards in modules that do not have enough inputs of their own, such as some VCAs or VCFs. == A little on how it works == Line 30 ⟶ 31: When inserting ICs into sockets, take care not to accidentally bend any of the pins under the chip. Also, make sure the notch on the chip is aligned with the notch marked on the PCB overlay. === Notes === * 47pF capacitors could be soldered between pins 1 and 2 and pins 6 and 7 of the TL072 should you find the mixer behaves in an unstable manner. This behavior is usually caused by high frequency oscillation, and these capacitors will stop it. This is more likely to happen if you replace the resistor between points A and B with a pot. * PCB 1" x 1.8" or 1" x 2" with four 3mm mounting holes 0.15" in from the edges, or in the case of the 2" version, with extra holes in the same location as on the 1.8" version.▼ == Parts list == Line 60: \| CGS04 PCB\|\|align=right\|1 \|} === Notes === ▲* PCB is 1" x 1.8" or 1" x 2" with four 3mm mounting holes 0.15" in from the edges, or in the case of the 2" version, with extra holes in the same location as on the 1.8" version. == CC-BY-NC == Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work. == See also == * [[CGS CV mega mixer]] for an enhanced version of CGS04, designed for both audio and CV mixing. * [[CGS DC mixer (previous version)]] * [[CatGirl_Synth#The_CGS_modules\|The CGS modules]] * [[CGS parts FAQ]] == References == * ''[https://web.archive.org/web/~~20170207062911fw_~~20170207062911f/http://www.cgs.synth.net/modules/cgs04_mix.html D.C. Mixer for music synthesizers]'' ~~(Archived)~~ by Ken Stone, 2007, with permission of the author - archived == External links == * [http://bompiler.com/pcb/cgs04 CGS04 BOM] at BOMpiler * [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc. === Suppliers === * [https://web.archive.org/web/20181120195724/http://www.elby-designs.com/webtek/cgs/cgs04/cgs04_mix.html CGS04 DC Mixer], revision 2.2, Elby Designs [[Category:CGS ~~modular~~CV processors]]