Hello all, I'm looking at replacing mechanical potentiometers in a variety of existing devices with digitally controlled ones. I find several manufacturers of digital pots, but I don't seem to be able to reliably match up the resistance of the existing pots with the digital ones.
For example, I can find 25K, 50K, 100K, even 1Meg digital pots, but two values I would commonly need, 250K and 500K, just don't seem to be available in digital. I can't change the design of the existing devices, I would need to adapt to them.
I'm not entirely ignoring current-capacity issues, but most of the time the digital pots would be fine in that regard.
I wonder if anyone could suggest a way to address this, even using a standard-value digital pot to control some other resistive device.
Thanks! Patrick Keenan