[sdiy] tubes, MOVs, etc.

[Cornutt, David K]

I saw something in the recent Mouser catalog that
looks like it could be fun: a programmable resistor.
Essentially it's a bunch of resistors in series on
a chip, with a tap selector that is moved back and
forth by pulsing increment and decrement inputs.
The current versions are only availabe with (at most)
100 taps, so quantizing would be a problem for a
lot of things, but future version might have more
resolution than that.