>I may not be seeing something here, but why don't you just use a stepper
>motor connected to a log pot? It is much more cumbersome than the digital
>log pot, but it requires less power, board space, and cost than N relays
>for 2^N steps.

Don't be so sure.  One of the popular 'high-end' pots is the Penny & Giles
(sp?), and it isn't cheaper than 32 relays, a handful of resistors, and a
handful of transistors.

One big problem with inexpensive log pots is interchannel tracking, so you
hear the soundstage shift back and forth as you turn the knob.

And if you're doing a balanced circuit, you need a pricey, hard to find 4
element unit...


newell