Constructing Various DC Power Supplies Projects
One of the basic building blocks of electronics project is building your own DC power supplies from an AC source of 110 VAC or 220 VAC. The common DC voltages that are required to power up
the devices are generally in the range of 3 VDC to 30 VDC. Typically the fixed types of DC voltages are 5V, 9V, 12V, 15V and 18V DC. With the advancement of technology, many devices are using 1.8 V DC these days. SMPS is becoming common these days as the demand for miniaturisation due to space constraints increases.
Take note that for linear power supply projects, you need to use a step down power transformer to step down the AC voltage from the line voltage of 110 VAC or 220 VAC before using it to supply to the diode bridge. Variable 2 to 25V DC Supply This project uses a LM338 adjustable 3 terminal regulator to supply a current of up to 5A over a variable output voltageof 2V to 25V DC. Variable 5 to 15V DC Supply This is a simple DC regulated supply project using 7805 voltage regulator to obtain a variable DC voltage range from 5V to 15V. Variable 5 to 20V DC Supply Build your own 5-20V DC power supply using National Semiconductor LM2941 low dropout voltage regulator. Simple fixed 5V DC Power Supplies Project This project provides the schematic and the parts list needed to construct a simple Supply from an input supply of 7-20 V AC or 7-30V DC. Two DC voltage outputs are available; 5V and variable from 5V upwards. Constructing a universal DC Supply This is a basic, text-book, variable DC supply voltage regulator circuit using an LM317 from input supply of 7-20 V AC or 7-30V DC . The output voltage can be set to anywhere in the range 1.5V to 30V. Variable DC Supply Another version of variable DC supply using LM317 that uses an LED to show the ON/OFF status of the supply. Constructing a Dual Polarity Supply This project provides a dual polarity 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. Constructing a 12V DC Switch Mode Power Supply Construct a 12 VDC, 120 mA switch mode supply from AC source of 85-265 VAC. 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. 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.
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