guitarnut Posted February 20, 2011 Report Share Posted February 20, 2011 As my amp collection grows and the studio shrinks, I decided it would be nice to have a signal switching system in place. This way I can leave all of the amps cabled and just power up the single or pair I want to use on a particular part. So, first step was to design the circuit. It's pretty basic but allows for all combinations of left and right signal to go to any amp as well as an off position for each amp. I used a separate load resistor for each LED just to make sure I didn't overload anything in case 3 or 4 switches got turned on at the same time...this design will handle all switches at the same time. The main ground is a buss that tags the ground on each signal jack as well as the negative terminal on the DC jack. Then it was just a matter of connecting each LED cathode to the buss by way of it's load resistor. The entire box is earthed thru the amp grounds by way of the signal. I decided to change the DC voltage to 12vdc since I had a wall-wart laying in the drawer...no need to buy a new one. I also opted to use looms for DC, and left/right signal.instead of series jumpers from switch to switch. This way if one switch has an issue, it doesn't affect the others. Here are some shots of the various stages of the build. Quote Link to comment Share on other sites More sharing options...
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