First the basic things should be understood
1. We should not give 230v ac supply directly to the circuit, because all electronics items are designed up-to 9v-15v.
2. 230V can be step-downed to 12V through step-down transformer.
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.
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.
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.
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