Dual Regulated Power Supply
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. Link
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Easy power supply 0-15V 0-1A
Dual Rail Power Supply +/- 0 to 15V 1A by LM317,LM337
Dual Rail Power Supply +/- 0 to 15V 1A by LM317,LM337
Dual linear regulator +15V -15V by Transistor Only
