[sdiy] DQOM

[harrybissell]

Some EGs basically respond to a gate... so if you have too long of
a trigger they will do an A-S-R response.  So you might want to differentiate
the 'gate'.  Noiw if you stick a trigger in there instead it might not work.

I think that 50us might be a little short. 100us would be the shortest I think

I'd try.  In your use, I might make the short pulse and then have a one shot
to stretch it in case it did not work, There are a lot of EG designs out
there...
some of them pretty lame (including some of my early designs... the only thing

I can take credit for is that they were an improvement on the PAiA 2720 series

AR generator, with its funky unijunction reset circuit that bled through into
the
output - YUCK !!!)

H^) harry

Ian Fritz wrote:

> Hi Harry --
>
> and thanks for the response.
>
> >I'd vote for 1ms, because some folks use simple differentiators to
> >do some functions and 50us might not whack them hard enough...
>
> Not quite following that.  A differentiator responds to the slope of the
> signal, which has to be large for a narrow pulse.  Now if you were talking
> about an integrator ... that would respond to the area under the pulse,
> which would be small for a narrow pulse.  Why do they differentiate the
> trigger pulse, anyway?
>
> >1ms is long enough for probably any electronic circuit to respond, but
> >short enough to be a single click to a human (we would not hear both
> >the rising AND falling edge).
>
> Right. I agree for controller signals.  But I am trying to do two separate
> things -- control generator trigger generation, but also audio frequency
> functions such as sync.  A 1 ms pulse would severely limit the latter.
>
> >I've done some playing with this recently with my guitar synth... some of
> >my 20us pulses did NOT work with all my EGs...  So I made them longer
>
> Ah, that's the kind of info I am looking for.  Did you check what the
> smallest pulse that would work was?
>
> Best regards,
>
>    Ian