[sdiy] Trigger pulse length

[Scott Gravenhorst]

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:
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>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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