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