[S&H]

[tomg]

>I remember a circuit that does this (but where?? Ideas for design, Design
>Ideas, databook ??) . I'll look for you. The technique is to use an analog
>sample and hold for short term storage, then ramp up a D/A converter until
>the
>output is equal to the analog S/H. Then switch from the analog value to
the
>digital one. This might be too slow.

All I want to do is replace pots. I don't think it needs to be too fast. 
I would love to see an example if you can find it. Thanks Harry.

-tg