Here is circuit power supply switching regulator, use IC LM2575 (good and easy IC switching regulator) for cotrol Voltage output 1.2V – 12V From Input Voltage 12V-20V. Detail see in circuit.
This circuit is suitable for a variety of uses. If you have a solar powered 12 Volt lead-acid battery power source, the circuit can be used to efficiently power lower voltage devices. It can be used to provide power to devices that normally use a set of small batteries for power. Common voltages such as 1.5V, 3V, 4.5V, 6V, 7.5V, and 9V can be produced by this circuit….
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