Bob Johnson (@Bob11)
Ah yes, it seems I completely misread the OP--his goal is to drive the movement itself directly. Sorry about that.
Couldn't you just put another 10K resistor in series with the meter? That would basically cut the current in half and make it a 0 to 20V meter.
I'm familiar with the 68HC05 from many many moons ago, but not this specific part. The only way to know for sure is to contact the manufacturer (Freescale/NXP?)...
You haven't given us much to go on. There's no guarantee the circuit you built looks like the circuit you drew. No reflection on you--a number of mine don't either....
What voltage are you seeing across the similar caps on the other channels? It appears from the circuit that the cap doesn't typically see much voltage across it....
A zener diode is usually used for voltage regulation. All you need is reverse blocking (of 12V), and minimum forward voltage drop (from 5V). A Schottky diode with...
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