A-B Switching

Miscellaneous
1

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!

Thanks

uclaros

2

not sure, but maybe it’s because you’re linking the ground of each output?

3

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!..

4

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.

greets

Doc

5

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