How to Build a 12V 3A Power Supply Using 2N3055 Transistor
Introduction.
In this tutorial, you are going to learn How to make a 12 Volt 3 Ampere Power Supply. But, before making the circuit let us discuss some information about the power supply circuit. A power supply may be described as electrical equipment that supplies electricity to electrical loads. This device’s primary job is to convert electrical current from a supply to the precise voltage, and current required to supply a load. Electric power converters are another term for these power supplies.
Power supplies are an essential component of many electrical devices. While some are battery-powered, others require main power, and the electrical circuitry and design of the power supply are critical to the equipment’s overall success. Electronic power supply circuits can be broken down into several building blocks. Each is critical to the overall performance of the power supply, but each component of the power supply electronics must work adequately for the entire unit to function properly.
Materials for the Project
- 1x 2N3055 NPN Power Transistor
- 1x 1N4007 Diode
- 1x Zener Diode 12V
- 2x Resistor 680 ohms
- 1x Capacitor 5000μF
- 1x Capacitor 0.01μF
2N3055 Pinout.
Pin Name Function Pin 1 Base (B) Controls the transistor operation Pin 2 Emitter (E) Current flows out (NPN type) Case Collector (C) Connected to the metal body/case
Notes:
2N3055 is an NPN power transistor, widely used in power supplies, amplifiers, and motor drivers.
It can handle up to 15A current and voltages up to 60V.
Heatsink is usually required due to high power dissipation.
Download Circuit Diagram
Application and Uses
- DC supply is used in a variety of power amplifiers
- Also in oscillator circuits.
- Low voltage applications such as charging batterie
- Low voltage, and low current applications all require DC power sources.
- In different electronic projects.
Working Explanation
The given 12 Volt 3 Ampere Power Supply circuit has the following elements:
- A step-down transformer that converts 230 volts AC to 12 volts DC.
- To convert AC to DC, a bridge rectifier is used.
- A capacitor that filters AC ripples before passing them on to the voltage regulator.
- Finally, the regulator regulates the voltage, and the pulsing waveform is captured by a blocking diode.
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