In this circuit, the 7815 regulatates the positive supply, and the 7915
regulates the negative supply. The transformer should have a primary
rating of 240/220 volts for europe, or 120 volts for North America. The
centre tapped secondary coil should be rated about 18 volts at 1 amp or
higher, allowing for losses in the regulator. An application for this
type of circuit would be for a small regulated bench power supply.
Dual Regulated Power Supply Circuit Diagram
