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Old 11th Dec 2017, 1:16 pm   #34
Argus25
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default Re: Matched Transistors

Possibly yes if the meter was sensitive enough. It would also have to respond to a ripple voltage at the test frequency, so it would have to be a center zero AC meter. With the OP amp its easy to subtract signals, add gain, precision rectify the ripple(error voltages) and feed a boring insensitive DC meter.
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