[sdiy] Best way to limit control voltage

[J. Larry Hendry]

Oh, now there is a variation on clamping I had not considered. That is
setting the opposite end of the diode (plus the junction drop when
conducting) for the value.  That might be great since I need many copies of
this circuit  I could use a couple of constant reference voltages and clamp
several of my circuits to the same voltage references.
Thanks,
Larry


-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Scott Gravenhorst
Sent: Sunday, March 13, 2005 8:56 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Best way to limit control voltage


Sounds like a job for a diode limiter or clamp circuit.  As long as the
input
voltage is below the clamp, it varies normally because the diode is not
conducting, but when the input goes above (or below with a reversed diode)
the clamp, the diode conducts and forces the output to maintain a
programmable level.  The programming is done by supplying a constant voltage
at the other end of the diode.

"J. Larry Hendry" <jlarryh at iquest.net> wrote:
>I'd like to tap into the vast expertise again and ask what methods people
>are using to be efficient with limiting a control voltage.  I am designing
a
>circuit that will have more than one input.  One of the inputs needs to be
>capable of producing the full output range needed in the circuit.  But, I
>also want to limit (or clamp) the output so it does not exceed my
>predetermined values.  The sum of the inputs might normally cause that to
>happen.  I cannot solve this with scaling.  So, I need to consider
efficient
>ways to clamp the output to within a certain range.  I have an idea that
>will work.  But, it is not as part efficient as I would like to be.  So, I
>would appreciate hearing from others about their approach to this issue.
>
>Thanks
>Larry Hendry
>
>

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