picbits - looked at that before. F-V isn't what I want. I need to turn approximate position, given by the number of pulses, into a voltage. As long as it tracks, accuracy isn't important.
MikeML - the original idea was that it would reach some preset voltage, and reverse itself, so the voltage would start going down instead of up. But it's a flawed approach, the reversal needs to originate from the controlling device (a pot on a foot pedal). So a reset (or set, I suppose) only occurs in the event of overshoot.
dr pepper - a more precise version of what I posted above, then (where the output voltage is from C2, btw). Ok trying my existing simulation with a constant current. Horribly slow...
Dekatron! I thought those were just display devices?
I'm thinking there's going to be maybe 100 bars on my encoder strip - cut from a length pulled from an old printer, so I need 8 bits, if I do counter/dac route. Hmmm, 74hc590 and dac0832 are cheap on eBay...
Maybe I would be better to ditch the foot-pedal pot and use another encoder, do it all with a microcontroller. I soooo wanted to avoid that