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Master PCB (incorrectly labelled in current batch as CGS387S)

4-Stage PCB

This is a redesigned circuit board for the CGS359 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 column/stage boards (CGS387S) have been replaced with boards that contain 4 stages and are now a standard CGS size allowing them to be stacked with the main PCB (CGS387M incorrectly labelled CGS387S in current batch). Pots and their mix resistors can be mounted on something like the CGS94 Pot Carrier if you want 1" horzontal spacing, or simply panel mounted and hand wired as was traditionally done.

The Programmer/Sequencer is a Serge inpired multi-stage sequencer. Unlike most sequencers, this one makes no use of binary counters. Rather, it uses a set of individual stages, each one directly accessible. As such it could be considered to allow "random access".This module replicates the programmer, but with one major exception - left and right 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. Left or right 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. The maximum number of stages is of course chosen prior to building.

PCB Dimensions:
CGS387S - 2" x 6" with 3.2mm fixing points 0.15" from the edges
CGS387M - 2" x 6" with 3.2mm fixing points 0.15" from the edges
Power Consumption: +12V @ -12V @

Original article, art & design copyright by Ken Stone

Email:  elby-designs@bigpond.com
© Copyright 2000. All rights reserved.     Revised: February 17, 2021