Capacitors are one of the basic components in any electronic projects. Now, here we taught you, how to test capacitor either is short, open or working. The simple circuit of capacitor tester is built around two general purpose NPN transistors. This circuit posted here is used to test capacitor up to 1000 µF. The capacitor to be tested is connect at point A and B as shown in circuit diagram (positive terminal at point B where negative terminal at point A).
Working of the circuit:
When we supply the voltage to the circuit the two LEDs connected starts glowing and is continue glowing even capacitor to be tested is connected, this means capacitor is open. If single LED is glowing then the capacitor is short, where both the LEDs glow in interval means capacitor is good and can be used in electronic circuit.
|Resistors (all ¼-watt, ± 5% Carbon)|
|R1, R3 = 56
R2, R4 = 220
|C1 = 10|
|T1, T2 = BC147, BC148
LED1, LED2 = any color LEDs