Τhis circuit gives regulated dc power with variable voltage level, here IC LM317 used as a regulator and variable resistor R2 adjust the output voltage. output from this circuit can be varied from 1 volt to 30 Volt depends on the applying maximum Dc input to the regulator IC.
Components List
| S.No | Name | Quantity |
| 1. | Diode 1N4001 | 5 |
| 2. | Capacitor 1000uF & 0.1uF & 10 uF | each 1 |
| 3. | IC LM317 | 1 |
| 4. | Resistor 18 K & 220 R | each 1 |
| 5. | Variable Resistor 10 K | 1 |
| 6. | Stepdown transformer 230V to 25V-500mA | 1 |