BENCH_POWER_SUPPLY_METER

Published:2009/7/16 4:04:00 Author:Jessie | From:SeekIC

The heart of the digital meter is the Harris ICL7107 A/D converter. The 7107 contains all the active devices needed to construct the voltmeter. These include the segment decoders and LED display drivers. The optional push-button switch connected to pin 37 of the ICL7107 permits the display to be tested. When that pin is connected to +5 V, the display will indicate -1888, testing all the segments. If a liquid-crystal display is preferred, substitute an ICL7106CPL for the 7107. All pin connections will be the same, except that pin 21 will become the backplane instead of the digital ground.



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