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Wiring Instructions for Galaxy Echo-only Boards Solder brown wire on white connector labeled J4 to an 8 volt source Solder black wire on white connector labeled J4 to DC ground On radio mic jack locate and remove audio input wire to main pc board Solder white wire from J2 to audio input pin on mic jack Solder black wire from J2 to ground pin on mic jack Solder white wire from J1 to main pc board where audio input wire was Solder black wire from J1 to main pc board ground Mount attached dual potentiometer to desired location Click here for diagram