Single Output Power Supply 12V / 5A based on LM338

Power supply 12 V 5A, based on an LM338

This Single output 12 V / 5A power supply provides power for equipment that requires a large energy (Audio amplifier for car radio, CB, etc.). It is built around a voltage regulator like the LM338 and capable of providing voltages between 12V and 15 V (13.8 V for example). This circuit can provide a maximum current of 5 A.

The diagram above shows all complete circuit of power supply, and is based on the use of common components, except perhaps for the voltage regulator was chosen here, an LM338, which is rarely used instead of the LM317. The use of integrated controller LM350 (3 A) to replace the LM338 (5 A) can be done if the needs of output current does not exceed 3A. Note that the LM338 and LM350 are nearly the same price, would be better if you order a LM338.


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: 12 v power supply 12V/5A schematic 5A power supply LM338 LM338 voltage regulator Single output power supply

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  1. author

    Mahesh bari1 year ago

    I want to build 12v 5A and 12v 10A smps for CCTV purpose which is having 4,8,16 outputs.can you help?