This is a basic circuit diagram of power supply that has dual voltage. The design is for 12 volts.
Circuit Specs are as follows:
Transformer - 28 to 36 CT, 1A (min)
Capacitors - 35 V
Bridge Rectifier - 100 V, 2 A
C3, C4 - Ceremic, 50V
Caution: Input/ Ground are reversed between the 7812 and 7912
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