CGS programmer/sequencer (previous version) (view source)
Revision as of 18:42, 19 July 2022
, 1 year agoText replacement - " (archived) by Ken Stone, 2004, with permission of the author" to " by Ken Stone, 2004, with permission of the author - archived"
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== Construction ==
[[File:cgs_pcb_cgs59_prog.gif|thumb|center|600px|The component overlay for the Programmer/Sequencer.]]
Before you start assembly, check the board for etching faults. Look for any shorts between tracks, or open circuits due to over etching. Take this opportunity to sand the edges of the board if needed, removing any splinters or rough edges. (With the boards supplied by me, the edges are already milled, and etching faults are very rare.)
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On the rear of the "B" board there are a number of small square pads, near the TL072s and the PSU connector. These pads are in pairs, one on pin 8, and its pair near by on the thick 0V rail, and one on pin 4, and its pair nearby on the 0V rail. These are for 100n 1206 (or even 805) SMD capacitors (or 10n, or 47n - it isn't critical). Put a little solder on one pad. Move the capacitor into position, and re-heat the solder. The capacitor will now be held in place. Solder the opposite end, then go back and tidy up the first joint if needed. Use ceramic monoblock caps, NOT electro or tant.
On the rear of the "B" board, below the LM393 there are two square pads connected to pins 4 and 8. These are to allow a 100n
This board set is a little different to most CGS boards. There would be too much wiring needed if pots had to be hand wired to the PCBs, so I have gone with a design that mounts as much as possible directly on the PCBs themselves, as well as making parts that do need wiring as close as physically possible to their wiring points. The photographs below will help explain things. If you wish to use a different panel arrangement, it would of course be possible to remote-mount the pots etc., though I expect you would soon be wishing you hadn't.
The vertical centers for '''ALL''' of the holes is 3/4 of an inch - standard Serge spacing for 8 vertical controls. Horizontal spacing is not fixed, but is best at an inch (Serge standard).
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The skip functionality was developed at the suggestion of and in conjunction with Ryk Thekreator.
== Notes ==▼
* PCB 6" long, mounting off pots at 3/4" centers.▼
* All type B boards that do not have a revision number have an error. Physically between the two BC557s on the PCB is a 47k resistor. This should be 470k, and will solve problems some of you are having with the common pulse out. Electrically it forms the upper leg of a voltage divider connected to the emitter of lower transistor in the Common Pulse out circuit.▼
== Parts list ==
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| CGS59B PCB||align=right|1
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▲=== Notes ===
▲* PCB is 6" long, mounting off pots at 3/4" centers.
▲* All type B boards that do not have a revision number have an error. Physically between the two BC557s on the PCB is a 47k resistor. This should be 470k, and will solve problems some of you are having with the common pulse out. Electrically it forms the upper leg of a voltage divider connected to the emitter of lower transistor in the Common Pulse out circuit.
== 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]]
* [[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/synapse/synapse.cfm?pc=43&folder=march1977&pic=31 Synapse March/April 1977, p. 30]
* [http://bompiler.com/pcb/cgs59a CGS59A stage board (A) BOM] at BOMpiler
* [http://bompiler.com/pcb/cgs59b CGS59B control board (B) BOM] at BOMpiler
=== Suppliers ===
* [https://web.archive.org/web/20181117104908/http://www.elby-designs.com/webtek/cgs/cgs59/cgs59_prog.html CGS59 8-Step Sequencer], revision 1.1, Elby Designs
[[Category:CGS
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