How To Make Variable Power Supply Dual Voltage

Introduction

A variable power supply is an essential tool for anyone working with electronics. It allows you to regulate the voltage and current going to your circuit, ensuring safe and proper operation. A dual voltage power supply is even more valuable, as it allows you to independently control two voltages on the same circuit. In this article, we will explain how to make a high-quality variable power supply dual voltage using an LM317, LM337 regulator and a pair of 2SD1047 transistor.

LM317 Regulator:

The LM317 regulator is a high-performance voltage regulator that can output up to 37 volts with a current of up to 1.5 amps. It is available in a TO-220 package and can be easily mounted on a heat sink. The LM317 is a great choice for a variable power supply because it has an adjustable output voltage that can be set using a simple voltage divider circuit.

LM337 Regulator:

The LM337 IC is an adjustable voltage regulator integrated circuit that can provide a regulated output voltage ranging anywhere between -1.2 V and -37 V, with the input voltage between -40 V and -3 V. The device features a pass transistor that can handle a current of up to 1.5 A. The LM337 IC has a typical dropout voltage of 1.2 V when the output voltage is set to its maximum value. The output voltage is adjustable by means of an external resistor connected between the output and the adjust terminal of the IC. It is commonly used in power supply applications to regulate the voltage of the output circuit.

2SD1047 Transistor:

The 2SD1047 transistor is a high-power NPN transistor rated for 140 volts and 12 amps. It is commonly used in audio amplifier circuits, but it is also useful as a power transistor in a variable power supply. The 2SD1047 transistor is used in this design to provide the high-current output required by certain electronics projects.

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Circuit Diagram of Variable Power Supply Dual Voltage

This project can be designed using a few basic components. The circuit diagram of this project is shown below.

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Components List of Variable Power Supply Dual Voltage

Following is the list of all components used in this project:

1X LM317 IC
1X LM337 IC
2X 2SD1047 TRANSISTORS
1X D10XB60 RECTIFIER
2X 1000uF CAPACITORS
2X 5K POTENTIOMETERS
2X 0.33 OHM RESISTORS
1X 2.2 OHM RESISTOR
2X 220 OHM RESISTORS
2X 3 PIN TERMINAL BLOCKS
1X PERF BOARD
JUMPER WIRES

Explanation of Variable Power Supply Dual Voltage

Designing the Power Supply:

To design a dual voltage variable power supply using an LM317, LM337 regulators and a pair of 2SD1047 transistor, we will need to follow a few basic steps:

Determine the required output voltages and current.
Choose the appropriate transformer for the power supply.
Select the capacitors, diodes, and resistors required for the circuit. Recommended parts are list above.
Build and test the power supply.

Conclusion

By following these steps, it is easy to make a high-quality variable power supply dual voltage using an LM317, LM337 regulators and a pair of 2SD1047 transistor. By adjusting the output voltage and current, you can use this power supply for a wide range of electronics projects. With its simple design and reliable components, you can count on this power supply for years of use. If you are looking for a reliable and flexible power supply for your electronics projects, then this dual voltage variable power supply is the perfect choice.