How to make 12 Volt 3 Ampere Power Supply – DIY

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 mains 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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5$ PCB Prototype

https://www.youtube.com/watch?v=6VvwZ7Z-jTw

Hardware Components

The following components are required to make a 12V 3A Power Supply Circuit

S.no	Component	Value	Qty
1.	Stepdown Transformer	230V/15V	1
2.	Power Transistor	2N3055	1
3.	Diode	1N4007	4
4.	Zener Diode	12V	1
5.	Heat Sink	–	1
6.	Resistor	680 ohms	2
7.	Electrolytic Capacitors	5000μF	1
8.	Breadboard	–	1
9.	Connecting Wires	–	1
10.	Ceramic Capacitor	0.01μF	1

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2N3055 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3055

12V 3A 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.