This is a simple design circuit for battery tester circuit. In this circuit, operating will controlled by transistor 2N3904. This is the figure of the circuit;
In the circuit, LED will turn on if the voltages is over 42V. Threshold will increase about 1 V per 1 kilo ohm increase in R2. The current drain is about 7 mA with button pressed.
[Circuit schematic source: Hobby Projects Application Notes]
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