[sdiy] Question for the sages...

[harry]

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 ???

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