9 Volt 2 Amp PSU with 78S09


Posted on Jul 21, 2012

The circuit will work without the extra components, but for reverse polarity protection a 1N5400 diode is provided at the input, extra smoothing being provided by C1. The output stage includes C2 for extra filtering, if powering a logic circuit than a 100nF capacitor is also desirable to remove any high frequency switching noise.


9 Volt 2 Amp PSU with 78S09
Click here to download the full size of the above Circuit.

There is little to be said about this circuit. All the work is done by the regulator. The 78S09 can deliver up to 2 amps continuous output whilst maintaining a low noise and very well regulated supply.




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