[sdiy] linear CV to log / antilog / inverse?

[Nicholas Gregorich]

Julian wrote:
> Im messing with a project, and my current problem is that i want to 
> convert a simple 0-5v (or possibly a +/- 2.5v) signal from a linear 
> potentiomenter to different curves.
> 
> The curves do not need to be absolutly mathematically perfect - they 
> just need sound resonable : )
> 
> Whats the simplest / cheapest / easiest way to do this?
> 
> I only need one curve per pot, but im going to have about 20 pots, and 
> they will all need their own tailored output curve.
> 
> Thanks Julian
> 

How about an AVR or PIC microcontroller? You would sample with the ADC, 
use a lookup table to apply the function, and a PWM (and filter) to go 
back to the analog domain.

Nick.