Working of 5v Variable power supply circuit diagram

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5v power supply circuit is shown in figure. The main components of this power supply circuit are transformer, bridge rectifier, voltage regulator IC and capacitors.












Variable power supply circuit can be achieved by just adding a variac at the output to make voltage output to be 0 to 5v.

5v variable power supply circuit diagram



Transformer step downs the high voltage. Output of secondary winding is given to the bridge rectifier. The bridge rectifier converts ac into dc, this dc voltage is than given to the voltage regulator. Voltage regulator IC 7805 is used for controlling output voltage to be 5v.
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