Various meters based on the Siemens UAA 170 LED voltmeter IC have previously been featured in Elektor (issue 12, April 1976 and issue 17, September 1976). This article describes a voltmeter circuit using a companion IC - the UAA 180. The voltmeter can be combined with the PPM drive circuit described elsewhere in this issue (`peakmeter`) to make a compact audio level meter, and a novel board layout allows extension of the meter to any required number of LEDs.
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