This board includes 8 DPDT 5v relays, each will switch on or bypass an effect pedal. The board is directly connected to the output of the ULN2803 power driver, on the Output Board.
I bought several relays here. They work but I haven't tested them with an audio signal, I'll update the blog with the results. Hope there won't be any parasite noise !
Each relay should be wired like this :
I soldered all the eight relays on the same board, in order to make the shorter audio patch possible. Not sure that's a good idea, I may design 8 separate PCBs (including the FX In/Out audio jacks + LED) to make a cleaner build.
As you can see, the current prototype shown here does not include any LED, resistor or FX wire to the audio jacks :
The IA-2104-U is a USB Relay controller module, powered and controlled by a USB port. The IA-2104-U includes 4 SPDT Power Relays, with contact rating of 8 amp both at 30VDC and 240VAC.
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