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'[OT]: Logarithmic Potentiometer Search'
2001\03\23@180401 by Mark Peterson

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I need a source of small (5mm square or so) through-hole mount 25 Mohm
logarithmic potentiometers.
Anybody have a clue where I could find such a beast?

I did find a linear one.  Does anyone know of a way to effectively make a
linear one appear logarithmic?

Thanks.

Mark P.

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2001\03\23@194401 by David Minkler

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Mark Peterson wrote:
> I did find a linear one.  Does anyone know of a way to effectively make a
> linear one appear logarithmic?


Hi,

You can de-linearize a pot by connecting a fixed resistor (or resistor
network) from the wiper to one (or both in the case of a network) end(s)
of the pot.  You won't get a (truly) logarithmic curve but, depending on
your requirements, you may get an acceptable curve.  Hobby RC
transmitters achieve their non-linear "exponential" response in this
way.

What are you using it for?

Regards,
Dave

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