[sdiy] Question for the sages...

[patchell]

    Ok, I sketched up what I had in mind.  It is at:
http://www.oldcrows.net/~patchell/misc/splitter.html

harry wrote:

> I'm with Jim Patchell and the precision diode method.  Hey... you don't
> suppose that Doepfer will come out with this as a module soon ???
>

    I might have to add this to my list of modules myself.  Looks like a handy CV
processor. :^)

>
> H^) harry
>
> CHoaglin at aol.com wrote:
>
> > In a message dated 5/4/01 5:53:41 PM Pacific Daylight Time, chris at smg.org
> > writes:
> >
> > << I have a rather mundane question, but (like all my previous questions) one
> >  that is probably easily answered. Is there such thing as a simple circuit
> >  wherein you have an input for a control voltage, and (say...) a
> >  potentiometer for setting a split point, where all voltages over that point
> >  are sent out one output, and all voltages under that point are sent to a
> >  second output?
> >
> >  This seems like such a simple (and usefull) concept for a module, but I
> >  can't for the life of me find a module or example circuit that does such a
> >  thing, which leads me to believe that it's not simple at all. Thanks in
> >  advance for any help on this matter.
> >   >>
> >
> > It sounds like a job for a garden variety comaparator to me...use the pot to
> > set the threshold at which the output swings, and drive the base of an NPN
> > transistor with that, which routes the signal through it to one destination,
> > as well as driving a PNP transistor which cuts off the signal path to the
> > other destination. Input voltage below threshold=PNP transistor conducting,
> > signal fed to first output. Input voltage above threshold=comparator output
> > goes high, NPN transistor conducts, PNP stops conducting, signal fed to
> > second output...at least that's the first thing I thought of. Maybe someone
> > more experienced can think of something better?
> >
> > Chris

--
 -Jim
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