[sdiy] Formula for Audio & Log-taper pots?

[allenre at umich.edu]

Typical pots have 270 degrees of rotation.  Just draw a graph for him
illustrating rotation versus resistance.

Ryan

> I've read that audio taper pots have 15% resistance at the half-way point
> in their rotation, and that log taper pots have 10% resistance at the
> half-way point. Is this generally correct? I seem to remember that there
> was more than one taper being used by some engineers for audio, but I think
> these are the common ones.
> 
> Does anyone know of a more precise way to describe the "curve" of either
> the resistance vs rotation, or more importantly, the attenuation vs
> rotation? I would really like to find a formula to calculate either the
> resistance or the signal attenuation for a given amount of rotation.
> 
> thanks,
> Glen