Digital voltmeter on the C520 chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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Schematic diagram of a voltmeter (click to enlarge)
Printed circuit board
Input circuit options
Enabling Common Cathode LEDs
As decoders, you can use, for example, K514ID1, K514ID2. You can also use K155ID1 if decade indicators are used.
Transistors - type KT361 or similar other pnp conduction.
Publication: N. Bolshakov, rf.atnn.ru
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