手可摘棉花

AC Ohmmeter mR-71 Remake

Overview

The author OldGerman was browsing the Russian wireless cat forum and saw the AC ohmmeter mR-71 designed by Andery_B. This meter is actually an LCR meter. The original design is a bit rough. I wanted to make a mini version, so I modified it while making it. I modified some power supplies on the board and some peripheral circuits. Several op amps were a bit hard to buy at the time, so I found ADI models to replace them and made two. There were many feedbacks on the original discussion post, such as the calibration page freezing, measurement abnormalities, etc., so these changes made me a little worried about failure, but after a test, the measurement performance was still normal.

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Schematics, BOM, Gerber, etc.

Documentation

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