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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