Adjustable Voltage Regulator 3 Ampere

Adjustable voltage regulator circuit

In this scheme, adjustable voltage regulator IC 78L05 is used in conjunction with the integrated audio amplifier TDA2030 . Because of this, the stabilizer was very simple. The output voltage is regulated to 20 V with maximum current of 3 A. IC TDA2030 is protected against overheating and short circuits, making it a very reliable regulator.

This scheme is very simple. Besides the two chips, stabilizer actually contains only two potentiometers and several capacitors.

Adjustment is as follows: first, the engine turns potentiometer P1 to the maximum (in the direction of IC 78L05), and then the trimmer P2 is set to the desired maximum output voltage. Subsequently, the potentiometer P1 is used for fine adjustment of output voltage from this maximum value and practically to 0.

For a relatively small output current sink for cooling is not required. However, when the output current exceeds 1 A, or if the difference between input and output voltage is high enough, the amplifier IC2 will overheat, and a small heat sink is definitely needed.


Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.


Tags: 78L05 Adjustable voltage regulator tda 2030 variable power supply circuit

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