[sdiy] S-trig -> V-trig

[Happy Harry]

Hi Dan (et al)

Yes the one transistor approach is the right way to go...
the important point is that a voltage needs to come
from somewhere...

The V-trig to S-trig does not require an external power
source.

H^) harry


>From: "Dan Gendreau" <gendreau at rochester.rr.com>
>To: "Terje Winther" <terje.winther at notam.uio.no>,   "synthdiy" 
><synth-diy at node12b53.a2000.nl>
>Subject: RE: [sdiy] S-trig -> V-trig
>Date: Tue, 1 May 2001 09:47:08 -0400
>
> > do anyone of you have schematics for a S-trig to V-trig
> > converter?
> > I suppose I must have a +5V (or higher?) voltage taken from somewhere, 
>and
> > have it
> > turned on everytime the S-triggers grounds. Any suggestions for a simple
> > solution?
>
>Simplest way I can think of:
>An inverter with a 10k pullup resistor at its input.
>When the switch is open, the pullup presents 5V to the inverter and the
>output is 0V.
>Then the switch is shorted, the input is 0V and the output is 5V.
>
>The same trick could also be done with an opamp. It requires more 
>resistors,
>but the advantage is that you could put in a pot to select the trigger
>voltage.
>
>Anyone else have a better way?
>
>You can probably do it with a single transistor, but I have to work that 
>one
>out on paper first. My transistor skills are a bit rusty... heh.
>
>-Dan G.
>

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