audio to trigger

[Paul Perry]

At 05:16 AM 10/12/98 +1100, Stewart Pye  wrote:

>I'm looking for a way to convert the audio outs of my TR 707 to short
>trigger pulses for triggering analog drum sounds. I thought about a
>differentiator but I'd get several pulses with that, or a 555 one shot but
>I guess I'd get the same problem.

You could use a simple diode&cap&resistor rectifier/integrator, then run this to
a comparator with hysteresis. Parts count shd be pretty low, esp if you are
making
a bunch for a machine with sep outs.

Also, if you go 555, you can have a 'refractory' period (it triggers, but then 
cant trigger again for a fixed period). Using a comparator to trigger a
fixed period 
555 you cd probably run off the raw audio & have very few parts.

paul perry melbounre australia