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PASSIVEMATRIX: 4x4 passive matrix mixer PCB (14HP)
PASSIVEMATRIX: 4x4 passive matrix mixer PCB (14HP)
York Modular

PASSIVEMATRIX: 4x4 passive matrix mixer PCB (14HP)

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PCB for a 4x4 passive matrix mixer - you are responsible for sourcing components and fabricating an appropriate panel.

The board for this module differs from the abortive first run in that a) the pot layout is actually correct (mea culpa ...) and b) there are now four jumpers, one per input, so you can decide whether you want the inputs to be DC coupled (just put a wire bridge in) or AC-coupled (add a 100nF capacitor)

If you're not clear on how a matrix mixer works then Wikipedia actually has a decent article on the subject - basically you can route multiple sources to multiple destinations and each can have it's own mix, hence all the pots. Signal routing can be immensely confusing to begin with, and the best way to understand it is to refer to the schematic.

Finally, since the mixer is passive, you may find it useful to run your inputs through a buffer beforehand if you're piping the outputs to a VCO or similar. 100% through-hole components and an ideal beginners project - the BOM and schematic can be found here: https://bitbucket.org/yorkmodular/matrix-mixers/src/master/

Approximate board dimensions: 55 x 96mm