How to calbrate a DC voltage?

DaveC · 2015-04-03T03:58:40+00:00

I have a FET and a load and a micro outputting PWM. I want to convert the PWM to DC (low-pass filtered?) which will control the current through the FET. I also want to be able to calibrate the DC voltage such that for any given PWM duty-cycle I want to be able to adjust the resulting DC voltage plus or minus a yet-to-be-determined percentage. This will probably need to be done only once so a trim pot will be fine. I?m guessing this calls for a ?driver? transistor to drive the FET? Or an op-amp? Both? Open to any suggestions. Oh-so-helpful chicken scratch here: FET is IRFM150. Thanks for your help!

Apr 03, 2015 20 Replies

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DaveC 11 years ago

Thanks Ed, a very good explanation.

And to Jason for trying. (c;

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How to calbrate a DC voltage?

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