IN/GND/SW/OUT interface directly with the 4 pads at the bottom of
most PedalPCB boards.
IN pad on the top left corner of the board (and the corresponding ground pad beside it) go to your Input jack.
OUT pad on the top right corner of the board (and the corresponding ground pad beside it) go to your Output jack.
+/- pads on the top left of the board go to your DC jack.
From there, it depends on the circuit and how you plan to use the board. For the most typical installation you would connect the +/- pads on the top right of the board to the +/- pads of your main effect PCB. Then the mini slide switch on the right would select between 9V / 18V operation.
You'll need to determine if they effect you're using it with can handle (and would benefit from) 18V.
The "Fixed" pads at the bottom are for direct unswitched access to the supply voltages.
Some examples:
If you don't plan to use the voltage selector switch (and want to always power your effect on 18V) you would use the Fixed +18V pad at the bottom.
If you need -9V (for positive ground effects) you would use the Fixed -9V pad at the bottom.
If you have a circuit that requires 9V and 18V supplies you would use the Fixed +9V and Fixed +18V pads at the bottom.
This is the slide switch that fits the pads:
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Alternatively you could wire the pads to an external toggle switch.