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Constructing a Dual Polarity Supply

supply with the appropriate choice of transformer and 3-terminal voltage regulator pairs you can easily build a small power supply delivering up to one amp at +/- 5V, +/- 9V, +/- 12V, +/-15V or +/-18V.

Read more : http://www.electronics-project-design.com/DualPowerSupply.html

Constructing a 12V DC Switch Mode Power Supply

Construct a 12 VDC, 120 mA switch mode supply from AC source of 85-265 VAC.

Good Links
More Circuit construct a power supply
More circuit switch mode power supply
More Switching power supply Circuit
More about 12V power supply circuit


souec: http://www.electronics-project-design.com/SwitchModePowerSupply.html

DC DC Converter Circuit

Get an output of 0.6V to 5.0V DC 10A from an input voltage range of 4.5V to 20V DC using Linear Technology DC DC Converter Module.

Read more : http://www.electronics-project-design.com/DC-DC-Converter-Module.html

USB Battery Charger Circuit

This application circuit uses the MCP73853/MCP73855 linear charge management controllers for cost sensitive applications. They are specially designed for USB applications and adhere to all the USB specifications governing the USB power bus.

Read more : http://www.electronics-project-design.com/BatteryChargerCircuit.html