Electronic devices are very sensitive to fluctuations in the energy supplied to them. This problem can be solved by using a regulated power supply for them. This power circuit design is equipped with an adjustable voltage regulator to adjust the output as per the need. Adjustable voltage regulators have line and load regulation that is better than standard fixed regulators. The circuit is made using the following active and passive electronic components:
1. Rectifying Bridge
two. Resistors
3. Capacitors
4. Variable Resistors.
5. linear voltage regulator IC
In this design, the reduced AC from the secondary winding of the transformer is fed into the rectifier bridge for rectification. The output has pulsating DC that is filtered by a capacitor C1 (1000uF). This output needs to be stabilized against input variations using a voltage regulator IC (LM317) in series with the rectifier bridge. This regulator not only ensures stable output but can also be adjusted to obtain a desired level of voltage output. The regulator output can vary from 1.2V to 25V. This is achieved by adjusting the value of the variable (preset) resistor VR1 (5k 
). A fixed resistor
). A fixed resistor
R1 (220 
) together with VR1 forms a potential divider. A capacitor C2 (0.1uF) is used to suppress the oscillations, if any, produced in the voltage regulator.
) together with VR1 forms a potential divider. A capacitor C2 (0.1uF) is used to suppress the oscillations, if any, produced in the voltage regulator.Circuit diagrams
| Circuit Diagram-1.25V-25V-Variable Power Supply Rectifier Bridge |  |
Project Components
- Capacitor
- 1N4001 diode
- Default