[sdiy] Log -> process -> AntiLog

[patchell]

    Diode log circuits...well, they kinda work, but...if you have the
Analog Devices Non-Linear Application book, they have practical examples
of log and anti-log circuits....Seems like I recall something in the art
of electronics book...but, the diode log circuit seems to be more useful
for demonstrating the principles, rather than actually implementing log
circuits...but you are right, you just swap the resistor and diode and
you would have an anti log circuit.

Scott Gravenhorst wrote:

> I want to process the logarithm of a linear CV and then
> convert the result back to a linear CV (voltage, not current).
>
> I know that a log amp can be made with an opamp, input
> resistor and within the negative feedback loop, a diode.  Is
> there some simple way to get the anti-log voltage output
> function ?  Can I simply swap the diode and resistor so that
> the signal passes through the diode and the resistor is in
> the neg. feedback loop?  If not, then how?
>
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--
 -Jim
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