Simple idea, hard to do?

Discussion in 'General Electronics Chat' started by Ryder Spearmann, Feb 13, 2010.

  1. Ryder Spearmann

    Thread Starter New Member

    Feb 13, 2010
    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!
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    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.
  3. ifixit

    Well-Known Member

    Nov 20, 2008
    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.