[sdiy] Trigger pulse length

[Harry Bissell Jr]

A capacitor and resistor 'might' work. If the trigger
drive has good, low impedance and the input to the
next device has good, high impedance... it will work
fine.

It need not reduce amplitude much...

~but~ it would be VERY machine specific. What works
for
one will not work for the next.

If the unit sending the trigger has a resistor in
series with the output, you will get an RC filter from
that and it will slow the response, delay the trigger,
and lower the amplitude.

Do what your Uncle Scott suggests... Use an active
circuit, if only to use the capacitor and resistor and
a transistor buffer following it

H^) harry

--- Scott Gravenhorst <music.maker at gte.net> wrote:

> I don't think a capacitor (and resistor) by itself
> will do much good, it will lower the
> amplitude while stretching it and also delay it
> some.  Too low an amplitude will result in
> not reaching the trigger threshhold of the device
> it's meant to drive and delay means
> things won't trigger when you want them to.
> 
> A better solution would be a one-shot.  A 555 timer
> (or CMOS 7555) can do this and is a
> simple circuit (which can be found on the device's
> datasheet).  A 7555 can easily be
> powered with a battery.  It's output will be an
> adjustable rectangular pulse.
> 
> 
> "Fiercefish" <fiercefish at btinternet.com> wrote:
> >--=======AVGMAIL-43569DEB3A65=======
> >Content-Transfer-Encoding: quoted-printable
> >
> >I want to be able to extend the length of the pulse
> of the trig out from =
> >my various drum machines, ideally I'd like to be
> able to do so without =
> >resorting to a complicated circuit, can this be
> done with just a =
> >capacitor or something? Ideally I'd like to build
> it into a lead or a =
> >small box with a jack in and jack out and if built
> into a box maybe use =
> >a pot to adjust the length? Has anyone else done
> this?=20
> >
> >It would be nice to be able to turn it into a short
> gate pulse but the =
> >focus is on simplicity (no psu or pcb would be
> great!)
> >
> >Cheers
> >
> >FF
> 
>
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