Home Forums GuitarPCB Build Support Apollo problem (solved) Reply To: Apollo problem (solved)


When I received the kit, there was a white dot on the optocoupler (which I have never used). Knowing that the coupler has polarity (in the schematic), l looked it up and found a NSL-32 data sheet on Mouser that indicated it is the cathode, so I installed the coupler with the dot lead to the cathode side on the pcb.