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by phawinp
Sat Mar 06, 2021 9:54 am
Forum: Racks, Switching Systems and MIDI
Topic: Tap Tempo Pedal Build for the GCP
Replies: 33
Views: 104434

Re: Tap Tempo Pedal Build for the GCP

I've managed to build a tap tempo switch using a SPST momentary switch and 2 resistors.
At first I tried debouncing the switch, didn't go well for me :lol:

It's basically a fixed expression pedal with no pot.

Here's the clip:
https://youtu.be/01PSXCqs13o

Here's the wiring diagram:
Image

Mess around with the resistors, start with R1 = R2 and then decrease or increase the R1 value until it gives you CC Value 64.
You do have to measure the resistor values.

** CC value 64 works for me, it might not work for your gear. **
*** If you have another expression pedal that you wanna use, be sure to plug it in to an EXP port.
It affects the CC value of the other port somehow. ***

I end up with R1=9.33 kOhm and R2=9.75 kOhm.
Theoretically, if R2=9.75 kOhm then I think R1 should be around 9.45 kOhm but this is the closest I have.

This works fine sending MIDI CC to my Atomic Amplifire (tap tempo, turning things on/off).
No switch bounce problem at all.