Power Supply Schematic

Adjustable Power Supply Schematic

This is a power supply schematic with the output voltage can be adjusted and also comes with a charger circuit for cellular. With an adjustable output features, it can serve as a universal power supply.

This power supply schematic using LM317 regulator IC is very easy to set up using a potentiometer. Alternatively, you can easily modify it just by using LM317 calculator to determine the required resistor value corresponding to the desired output voltage.

Adjustable Power Supply Schematic

In the adjustable power supply schematic you will find a principle of calculation of an LM317 circuit. It can handle currents up to 1A. Use proper heatsink for LM317 if it has to dissipate more than 1W.

Power Supply Schematic

Adjustable Power Supply-Printed Circuit Board

Power Supply Schematic - PCB Circuit

How to calculate the voltage on this power supply schematic.

R2 = (192 x Vout) – R1
R2 = (192 x Vout) – 220

LM317 Circuit

Where R2 in ohms,
Vout is in volts, and must be at between 1.2 V and 35 V.

If the value of resistor R2 changes, the output voltage will increase and or decrease.
Vin should be at least 2.5V greater than Vout. Select a wall adapter with a voltage at least 2.5 V greater than your regulated output at full load.