Drum Oscillator trigger PW

[Stewart Pye]

Hi,

I'm building a velocity sensitive midi to Analog drum trigger circuit for
my DR110 and other rhythm boxes. (They'll be separate units). I've already
discovered that the oscillators respond well to varying amplitude triggers.
Anyway, to save a little experimenting:

How long does pulse have to be for the damping oscillators. They look like
a twin tee based around a transistor. The reason I ask is because I am
trying to avoid using Sample and hold. I'll drive the trigger ins from the
MUX after the D/A. The clap pulses are 1ms 0V trigger . I'm using a
software serial port for MIDI so it's going to be tricky (impossible)to
have a delay longer than 20uS. Hopefully possible but a lot of juggling
required. I guess if it needs a pulse wider than 20us I'll have to do
something like the sample/hold in the paia Midi-CV with a software timer to
reset the pulse to zero.

Any Ideas anyone?


Thanks,

Stewart Pye