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2017-08-18 09:22  
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The circuit consists of 0-1 mA meter M1, 6.2-V zener diode D1, and 12-KO, 1 % resistor Rl. R2 is included in the circuit as a load resistor for the zener diode. The value of R2 isn`t critical; use a value of 1000 to 1500 0.

The meter reads from 6 to 18 volts, which is perfect for checking a car`s charging system.

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