Amp Footswitch LED.

[PhiloB]

Stupid question. But how does a passive amp foot switch LED get its power?

[selfdestroyer]

With the footswitch I made for a "favorite" button for the Strymon El Cap, it passed voltage on the tip of the 1/4" jack for the footswitch. I bet the amps do the same. Just a guess.

I would say to look at the schematics of your amp to see if voltage leaves the footswitch jack.

[PhiloB]

Thanks Selfdestrroyer.  I opened the footswitch last night and no battery.  It is a TRS cable.  It controls Channel selection and boost on/off. 
So, the schematic doesn't indicate that there is voltage but there must be. 
If the voltage doesn't return, then boost is off.  Is that how it functions?

[gtr2]

What amp?

Most run low voltage and the switch and led complete the circuit that flops a relay.

[PhiloB]

Just got an Ampeg GVT 52-112