Universal DC Power Supply

I didn’t realize till
the other day that I have never shown a circuit for a standard power
supply. Shown below is a supply that will use any of the LM78XX series
of voltage regulators. The transformer in the circuit will vary
depending on which regulator you use. For voltages from 5 to 12 use a
transformer with output of 18vac. With voltages from 15 to 24 use a
transformer of 30vac. The first capacitor in the circuit may need to
vary if you are supplying more current to the load. Typically it will be
2000uf for every amp of current.

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