[sdiy] velocity-sensitivity for footpedals ?

[John L Marshall]

> I'm considering for a future project converting a set of organ pedals to
> midi.  I'm wondering how I'd add velocity sensing to such a set-up.  Is
> this something that can be accomplished with readily-obtainable parts?
>
> Thanks,
> Elby
>
The first derivative of displacement is velocity. You need an analog
computer first derivative (opamp high pass filter) circuit. The second
derivative of displacement is acceleration. Hmmm, another high pass filter.