Here’s the design circuit of DC battery tester designed by Matthew B. This circuit can be used to measure DC battery from 1.5V up to 9V. This is the figure of the circuit;
It’s possible you have test with the values of R3 and R4 to have a precise reading from the meter. Every meter is different, so a little bit of experiencing using the resistor values is needed. Experiment with using a variable resistor instead of R3 & R4 to get a value of resistance that works.
Component Parts List:
R1 = 18K Ohm
R2 = 240 Ohm
R3 = 8.2K Ohm
R4 = 3K Ohm
R5 = 10 Ohm
M1 = Panel Meter (Anyone will work
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