A Simply 9V / 2A Power Supply

A simple 9 Volt 2 amp power supply using a single IC regulator.
simple 9 volt psu
This is very simple circuit. Everything is done by the regulator. The 78S09 can provide up to 2 amps continuous output while maintaining a low noise and very nicely regulated supply.

The schematic will work with no extra parts, however for reverse polarity protection a 1N5400 diode is provided within the input, additional smoothing being supplied by C1. The output stage includes C2 for extra filtering, if driving a logic circuit over a 100nF capacitor is also desirable to reduce any kind of high frequency switching noise.

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: 2 a power supply 9v power supply 9V power supply circuit

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