Here is another interesting project of Power supply. This is a circuit of a 1.2V to 25V/3A Variable Power Supply Using LM350. This IC is an adjustable three-terminal positive voltage regulator IC. It is capable of supplying 3A current over a 1.2V to 33V output range.
This IC is packaged in standard transistor packages which are easily mounted and handled. It is widely used for adjustable power supplies. It has many built-in features like short circuit protection, thermal regulation, etc. This circuit will provide a stable voltage between 1.2V to 25V with 3A current. You can adjust the output voltage through a potentiometer.
Hardware Components
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | IC | LM350K | 1 |
| 2. | Diodes | 1N4007 | 2 |
| 3. | Capacitor | 4700ΩF/50V, 10µF/40V, 1µF/40V | 1, 1, 1 |
| 4. | Resistor | 120Ω | 1 |
| 5. | Potentiometer | 2.7KΩ | 1 |
| 6. | DC Input | 30V | 1 |
Circuit Diagram
Working Explanation
The circuit shown in the figure above is easy to build and all the components are easily available online or in electronics shops. This circuit is using a voltage regulator IC which provides an adjustable output of 1.2V to 25V. The input signal of 20V DC is passed through a smoothing capacitor to cancel out any unwanted noises then the filtered DC signal is fed into the voltage regulator IC. This IC has three pins. Pin 1 is an Adjust pin that is used for the function of voltage adjustments therefore we have connected a potentiometer of 2.7KΩ with it.
The desired output voltage can be adjusted through this potentiometer. Pin 2 is the input pin where the DC signal is being fed into. The output is generated from Pin 3 which is an output pin. The output is passed through another smoothing capacitor to cancel out the remaining noise and provide a clear output. This is an ideal power supply where you want regulated voltage with high current.
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