CGS pot mounting rail
CGS94 the CGS pot mounting rail for Serge style panels PCB is designed to help mounting and wiring pots or LEDs to panels. It uses the 1 inch horizontal spacing standard of Serge panels, and provides mounting for 16 pots or LEDs.
Vertical height is limited by the size of the pots you use. 16mm pots are too large for 1" vertical spacing, so you will need to use 9mm pots in that case. Pads for both footprints are included.
|A||Input via RI|
|B||Input (Pot CW)|
|D||Out (Pot wiper)|
|E||Pot common (0V)|
|L||LED input via RL|
|M||Mix output from all pots via RM|
|RI||Input resistor for use with the A input. This forms a voltage divider with the overall resistance of the pot. A capacitor can be substituted in this location to AC couple the input. If no voltage divider or AC coupling is required, omit this part, and use the B pad as the input.|
|RL||LED current limit resistor. Value depends on LED and voltage used.|
|RM||Summing resistor. If using this board with a sequencer or a mixer, the RM resistor allows for the minimizing of wiring. The value of RM depends upon the circuit with which you are using the PCB.|
|LED||Your choice of LED, if needed.|
|POT||The value of the pots used depends upon the circuit with which you are using the PCB.|
If you are using the board for pots, you probably won't want the LED related parts, and vice versa.
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.
The CGS94 consists of 16 individual 'cells' at 1 inch spacing. Common to all cells are: the LED return (C) which will in most circumstances be connected to 0 volts, the pot return (E) which will in most circumstances be connected to 0 volts, the mix bus (M) which will be your output, usually buffered by an op-amp.
On the VER1.0 PCB there is an error with the pot pads. The inner CW pad is not connected to the outer CW pad. If you are using pots that use the outer pads, this is not a problem. If you use pots that have 0.1" spaced leads, you will need to join the two outer pads together. If the pot lead is long enough, just bend it across and solder it across both pads. If not, try bridging the pads with solder.
This is a guide only. Parts needed will vary with individual constructor's needs. Parts within the boxed area can be omitted if the switched outputs are not required. Part values will be determined by the circuit with which you are using this board.
|CGS94 V1.0 PCB||1|
Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work.
- Pot mounting rail for Serge style panels. (archived) by Ken Stone, 2014, with permission of the author
- CGS Synth discussion group, for discussion of locating parts, modifications and corrections etc.
- CGS94 Pot Mounting Rail, revision 1, Elby Designs