uclaros Posted March 4, 2005 Report Share Posted March 4, 2005 Hi all!I built today a simple A/B switch using a DPDT footswitch so that I can drive my guitar's output into 2 different amps, but NOT to use them simultaneously. I used the one side of the switch for the signal, and the other to control 2 leds (for status), but when the switch is on A, there is a little signal passing through to B and vice versa. Is this because I should be grounding the output I am not using? eg. when using A, B should be connected to GND? If yes, i will lose the capability of controlling the leds...Any comments are welcome!Thanksuclaros Quote Link to comment Share on other sites More sharing options...
jdutcher Posted March 4, 2005 Report Share Posted March 4, 2005 not sure, but maybe it's because you're linking the ground of each output? Quote Link to comment Share on other sites More sharing options...
uclaros Posted March 5, 2005 Author Report Share Posted March 5, 2005 Thant was my first thought too, and so I ground lifted the one output but had no difference...Then I thought the switch is faulty, but my multimeter showed me infinite resistance at the off position.Thanks anyway!... Quote Link to comment Share on other sites More sharing options...
doc Posted March 5, 2005 Report Share Posted March 5, 2005 Hi,your problem is a typical cross-talk problem.Why don't you use a relay to switch the two amps properly (whith grounding the other amp), In this way you can still drive the leds.greetsDoc Quote Link to comment Share on other sites More sharing options...
uclaros Posted March 6, 2005 Author Report Share Posted March 6, 2005 Well, I wanted to have it mount in a small box, so relays would need more space and more power.I think I will probably forget about the leds or try to find a 3pdtfootswitch!Thanks,uclaros Quote Link to comment Share on other sites More sharing options...
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