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5V 2A power supply using IC-78S05

My friend wants a 5V 2A power supply circuit. In model to be simple, use little equipment, build easy. Then, I choose this circuit for him. Why is it?  It uses pillar equipment, a positive voltage regulator 5V / 2A  in TO220, 78S05.  And few parts see in a circuit, is high-quality and low noise.

Power supply 5V 2A by IC 78S05

5V 2A power supply using 78S05

The circuit will work without the extra components, but for reverse polarity protection, a 1N5402 diode is provided at the input, extra smoothing being provided by C1-220uF 50V. The output stage includes C2-47uF 25V for extra filtering.


This circuit is not designed PCB. If you do not want to design own PCB. Or use universal PCB Board that difficult./

I would recommend a DC/DC Converter 12V Step Down to 5V 3A Power Supply Module. It is a DIY Kits available for use. I hope also this guide to be useful for you.

Although the circuits are is not the same. It can supply of 5 volts as well.

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Simple 5V 1A Switching regulator by IC LM2575-5.0
5V 5A switching regulator for digital by LM2678

This Post Has 3 Comments

  1. I have seen this voltage regulator circuit duplicated many times, but with different values for the smoothing capacitors. What is the reason for using different values in those capacitors? Does their value affect “smoothin” differently?

  2. Those “15W DC Converters” available on ebay are a joke, most will not even deliver an amp at 5V. Just try returning one>@@!

    @amishrobots The capacitor values are somewhat trivial. The larger is on the input, and the smaller on the output. Larger for ripple, smaller for noise.

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