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High-resolution AC/DC voltmeter with LED display

High-resolution AC/DC voltmeter with LED display
Voltmeters with LED display are very useful instruments for repair and maintenance work on electronic equipment. Unfortunately, their resolution is normally poor: of the order of ten per cent at the top end of the range. The instrument described in this article has a resolution at least twice as good and also measures audio frequency signals up to 10 kHz with small error.
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