This is a circuit of 12V 5V power supply. We can also say it combine or dual power supply circuit. The circuit is using two different fixed voltage regulator ICs. The first IC is LM7812 which will convert the voltage coming from the transformer and provides a 12V regulated output on the pin 1 of LM7805 IC.   

The voltage will then converted to 5V DC by the LM7805 IC, due to which you will receive two different voltages at the same time. Use suitable heatsinks with the ICs. The transformer can be a 230V or 110V to 15V to 20V 2A ratings.


12V 5V Power Supply Circuit Diagram
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