I have a drum pedal with a simple microswitch.

Nothing mechanical about the pedal can be changed.

I need to electronically delay the action of the switch by about 20 milliseconds.

It would be even better if I could adjust it in the 0 to 100 ms range or so.

Can a simple RC circuit do this?

I have no power supply, nor a ground, only what appears on the line to the switch, so the solution has to be rather passive.

Thank you!

 

It would take a "powered" circuit to do this right. A 555 timer chip could do this, and a pot can make it adjustable, but you will need a 9V battery, or a plug-in wall wart.

 

Questions:

1. What bias voltage is being fed to the switch when it is open?
2. What is the current draw when the switch is closed?
3. Once you have a 20mS turn-on delay, does it matter what the turn-off delay is?

Nothing is ever simple... accept nothing.