Notes:
Its a simple cirucuit, the regulator 78S09 is the heart of circuit and it can deliver up to 2 amperes continuous output whilst maintaining a low noise and well regulated supply.
This circuit can be make with out extra components but I added a diode IN5400 for reverse polarity protection, C1 provides extra smoothing and C2 for extra filering, if powering a logic circuit than a 100nF capacitor is also desirable to remove any high frequency switching noise.
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