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I am getting ready to finish a non-GuitarPCB pedal but would like to use 3PDT wiring board for the footswitch. The method that the kit company utilizes to wire a footswitch is a little different, but I would like to use a fairly standard footswitch PCB to make things a little simpler.
Below are depictions of how the boards are typically wired to the footswitch, both with jacks to the switch and jacks to the main board. Some of you pedal builders probably recognize this.
Using a GuitarPCB 3PDT board, I believe the switch could be wired to the board as below. The wire to the LED circuit on the board I believe should be attached to the negative LED pad on the switch PCB. I double checked and there is continuity from the Lug 5 eyelet/pad to ground. The “Main Ground” in the diagram is a star ground so I believe I can use one of the Ground pads on the board to connect to the main ground. This may not be necessary, but I plan to do it anyway just to make sure the LED on the main board is connected to ground when activating the pedal with the footswitch.
I also have another board, which I may use as I am awaiting some GPCB boards and I would like to get the pedal completed. Below is a diagram of the other footswitch board with the appropriate connections to the main board. The picture shows the underside of the PCB although I may mount it upside down to make the wiring a little simpler in my mind. Note the symbols on the board are as follows – IJ is Input Jack, I is Board Input, L is LED, O is Out from Board, and OJ is Output Jack. Next to the tiny O for the Board Output is another ground pad. I check all connections with a continuity tester and it seems that this should be correct.
You can see the solder pad connections on the top of the board drawing below. The center lug (Lug 5) goes to ground.
I believe I am correct on the wiring. Please let me know if anyone thinks I am wrong or can improve upon the use of the 3PDT boards.
Barry’s 3PDT wiring boards are universal. They will work with any effects board as long as there are six connections:
The I pad connects to the input jack. The BI pad connects to the effects board IN. The BO pad connects to the effects board OUT The O pad connects to the output jack.
If installing a status LED on the 3PDT board, the power must be connected to a +9V pad and a common ground must be connected to a G pad.
Check your wiring for these conditions and you should be just fine.
I know what all the pads are for on the GuitarPCB 3PDT board as I have used many of these. I really just wanted to make sure the LED connection I showed above was correct for this particular application, as the LED for this project is on the effect’s main circuit board and is situated on the board in a particular spot to be able to fit into a pre-drilled enclosure hole.
The board for this particular project is labeled as to which switch lug is to be attached to, as shown in the first drawing above, not a typical 3DPT switch wiring layout. I just wanted to make sure my translation of the switch wiring from the first drawing to the GuitarPCB board wiring was appropriate.
Since the boards I ordered haven’t arrived yet, I used the blue 3PDT board as depicted above that I had on hand and it works perfectly as wired above. The effect is alive and working well. Pictures will be forthcoming.
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