A DC power supply takes AC from the wall outlet, converts it to unregulated DC, and reduces the voltage using an input power transformer. typically stepping it down to the voltage required by the load. For safety reasons, the transformer also separates the output power supply from the main input. In this project, we will design a simple 3A 12V power supply circuit using a 2N3055 power Transistor.
2N3055 power transistors are a common part of 12V power supply circuits The 2N3055 is a semiconductor NPN bipolar power transistor that consists of three terminals called emitter, base, and collector. Unlike FETs (Field effect transistors) it is a current-controlled device in which a small current at the base side is used to control a large amount of current at the emitter and collector side.
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Hardware Components
The following components are required to make a 12 Volt Power Supply Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Stepdown Transformer | (230V/15V) | 1 |
| 2. | Power Transistor | 2N3055 | 1 |
| 3. | Diode | 1N4007 | 1 |
| 4. | Zener Diode | 12V | 1 |
| 5. | Heat Sink | – | 1 |
| 6. | Resistor | 680 ohms | 2 |
| 7. | Electrolytic Capacitors | 5000μF, 0.01μF | 1,1 |
| 8. | Breadboard | – | 1 |
| 9. | Connecting Wires | – | 1 |
2N3055 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3055
12 Volt Power Supply Circuit
Applications
- Used in various power amplifiers and oscillators to provide DC supply.
- DC power supplies are widely in use in low voltage applications such as charging batteries, automotive applications, aircraft applications, and other low voltage, low current applications.
- Used as an RPS (Regulated power supply) to provide the DC supply to the various electronic circuits such as small electronic projects.
