Any clever circuit design types here tonight?

I'm trying to debug a nasty problem and I need a power supply sort of thing where the voltage falls smoothly (and reasonably linearly) from 10 or 12 volts to 1 or 2 volts (or less) over 30 minutes or so. It needs to supply a couple of amps.

Anybody have a good idea how to do this? My poor old brain can't seem to come up with anything simple.

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SW-User

Some big RC circuit controlling an amp or something? If the time constant is big enough it’ll look linear.

FrozenWasteland · 61-69, M

@SW-User I was thinking of something along those lines... I got as far as a supercap, drained by a precision current sink to create a fairly linear slope, but then it needs voltage gain followed by a big ugly output stage to source the current. All of which starts to get a little complex for a one-off test.

It seems to me i should be able to do something clever with an adjustable voltage reg, but no useful circuit springs to mind.

I appreciate your thoughts...

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