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[[File:cgs_photo_cgs87_prog.jpg|thumb|center|800px]]
== Experienced builders only! ==
'''CGS87''' the '''CGS programmer/sequencer''' module is a redesigned circuit board for the [[CGS programmer/sequencer (previous version)|CGS59 Programmer/Sequencer]]. Unlike that version, this one has no panel-format specific PCBs. The master PCB still exists, though is somewhat different in structure. The output amplifiers have also been made using TL074 instead of TL072 chips. The column boards have been replaced with boards that contain 8 stages. Pots and their mix resistors can be mounted on something like the [cgs94_pot_rail.html CGS94 pot carrier] if you want 1"
The Programmer/Sequencer is a Serge
This module replicates the programmer, but with one major exception - up and down inputs allow it to be sequenced without connection to an external gate source. Any stage can be activated at any time by a direct pulse or button press. Up or down pulses will then step it from that stage. To limit the number of steps in the sequence, the pulse (gate) output of a stage is simply routed to the external pulse input for the first stage of the sequence. Note that the first stage used in a sequence need not be the first stage on the panel. For example it would be possible to have the first few stages used as an "introduction", with the sequence automatically looping to a stage in the middle of the panel once the sequence's first run was completed.
There is also no theoretical limit to the number of stages that can be used, and I do know of sequencers that have been built with 16 stages. The maximum number of stages is of course chosen prior to building. The astute will
== A little on how it works ==
[[File:cgs_schem_cgs87s_prog.gif|thumb|center|625px|The schematic for the CGS87S Programmer/Sequencer interface PCB. Only one of these is needed per programmer/sequencer.]]
[[File:cgs_schem_cgs87_prog.gif|thumb|center|339px|The schematic of a single stage of the CGS87 Programmer/Sequencer main PCB. Each of these board contains enough stages for eight steps. They can be cascaded for a greater number of steps.]]
[[File:cgs_schem_cgs87_prog_overview.gif|thumb|center|965px|The schematic of the
When looking at the PCB with the pads facing down, as per the photos and diagrams here, the LEFT end of the PCB is stage 1. This is fine if you work on the rear of your panels with the panel flipped top to bottom. If you wish to reverse the sequence order, simply use all UP connections as down, and all DOWN connections as up.
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The skip functionality was developed at the suggestion of and in conjunction with Ryk Thekreator.
== Notes ==▼
* PCB 8" x 2" with four 3mm mounting holes 0.15" in from the edges. Extra holes provided for carrying the sub-board.▼
== Parts list ==
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{|style="border:1px solid #BBB; display:inline-table; margin-right:25px;"
| colspan="2"|CGS87S
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| Part||align=right|Quantity
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{|style="border:1px solid #BBB; display:inline-table;"
| colspan="2"|CGS87
|-
| Part||align=right|Quantity
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| CGS87 PCB||align=right|1
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▲=== Notes ===
▲* PCB is 8" x 2" with four 3mm mounting holes 0.15" in from the edges. Extra holes provided for carrying the sub-board.
== 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 ==
* [[CatGirl_Synth#The_CGS_modules|The CGS modules]]▼
* [[CGS programmer/sequencer (previous version)]]
* [[CGS parts FAQ]]
▲* [[CatGirl_Synth#The_CGS_modules|The CGS modules]]
== References ==
* [https://web.archive.org/web/
== External links ==
* [http://groups.yahoo.com/group/cgs_synth CGS Synth discussion group], for discussion of locating parts, modifications and corrections etc.
* [https://web.archive.org/web/20170419010038/http://www.cyndustries.com
* [http://bompiler.com/pcb/cgs87 CGS87 BOM] at BOMpiler
* [http://bompiler.com/pcb/cgs87s CGS87S BOM] at BOMpiler
=== Suppliers ===
* [https://web.archive.org/web/20181121035221/http://www.elby-designs.com/webtek/cgs/serge/cgs87/cgs87_prog.html CGS87 Programmer Sequencer], revision 1, Elby Designs
[[Category:CGS
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