Low Cost Power Supply

Capacitor Power Supply

When you want to get a small current at low voltages from the mains current(230V AC), you have to step down  it using a power supply(Transformer, SMPS). But when you want a small current less than 50mA, you can use very inexpensive method to do it.  For example, you want to create a LED light for your room. Use a capacitive power supply for it.

Capacitive power supply is a very small circuit, it is used as power supply in very low power requirements from the direct mains current.

CAUTION!
The circuit is not galvanically isolated from the mains. Touching any part of the circuit (or any circuitry it supplies power to) while in operation, is dangerous and can result in an electric shock! This circuit should not be built or used by individuals without proper knowledge of mains voltage procedures.

 







This is a 9V power supply circuit diagram and you can change the output voltage by using a different zenor diode. I have used it as 9V so this power supply gives 9V. You can use series of 3 LEDs to connect to this circuit to make a LED light or you can use for your any requirements. You can make this power supply circuit with cost lower than 0.5$.

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