Drum Trigger input for Tap Tempo

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- March 10, 2011 at 4:29 pm #107706
  
  akavalve
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  Does anyone have a schematic for hooking up a drum trigger input in place of the external tap tempo switch? I figure it should be possible with a couple transistors in place of the diodes but I haven't thought it all the way through.
  
  Thanks, Andy
- March 14, 2011 at 5:45 pm #121731
  
  akavalve
  Member
  
  In case anyone's interested…..I've got this 80% figured out.
  
  A MOSFET in series with original diodes handles the switching nicely when driven with a monostable square wave pulse at the gate. The signal from the piezo doesn't quite cut it directly, but feed it a square wave and it tracks the tempo nicely. Now I'm just figuring out how to use the signal from the piezo trigger in the simplest way possible so I can use the drum triggers to do tap tempo.
  
  Should work with the external tap tempo for any pedals that use this three button switch arrangement.
  
  Best, Andy
- March 14, 2011 at 9:06 pm #121736
  
  timothyhill
  Member
  
  That's really cool! I could imagine a lot of uses for that… Keep us posted on your progress!
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