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

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

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

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

Variable DC Supply

Another version of variable DC supply using LM317 that uses an LED to show the ON/OFF status of the supply.

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

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.

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

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.

Related Links
More about 5v dc supply circuit
7805+Mj2955 power supply 5V 5A for digital circuit.
Simple 5V 1A Switching regulator by IC LM2575-5.0
5V 5A switching regulator for digital by LM2678

Source : http://www.electronics-project-design.com/DCPowerSupply.html

Variable 5 to 20V DC Supply

Build your own 5-20V DC power supply using National Semiconductor LM2941 low dropout voltage regulator.

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

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.

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

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 voltage of 2V to 25V DC.

Related Links
More about variable dc supply circuit
More about DC Voltage Regulator Circuit
More about Shunt Regulator Circuit
More about Dual Power Supply Circuit

Source:
http://www.electronics-project-design.com/PowerSupplySchematic.html

CAPS PROVIDE VOLTAGE BOOST TO SERIES REGULATOR

CAPS PROVIDE VOLTAGE BOOST TO SERIES REGULATOR
This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range. It can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply.

240VAC TO 5VDC POWER SUPPLY

240VAC TO 5VDC POWER SUPPLY
This is simple way to power some 5v logic from a 240vac source. If a 120vac power adapter is used, the circuit will also work for 120vac power lines.

LOW POWER 12,000 VOLT POWER SUPPLY

LOW POWER 12,000 VOLT POWER SUPPLY
If you need about 12,000 volts DC for an ion generator this circuit might be the ticket. It draws power from the 120vac power line but it uses a small 6KV camera flash trigger coil. The output signal is isolated from the power line. Although the circuit can only deliver about 5uA of current it can produce dangerous shocks, so be careful.

MINIATURE ISOLATED AC/DC POWER SUPPLY

MINIATURE ISOLATED AC/DC POWER SUPPLY
This circuit uses a novel approach to produce a fully isolated and regulated 5 volts @30ma from the 120vac power line. It uses two tiny SCRs that alternately discharge two capacitors through a miniature high frequency transformer. The voltage spikes produced through the transformer are rectified, filtered and regulated. A very common 8 ohm audio impedance matching transformer can be used for the transformer

12V DC Power Supply - uses 12V 5A transformer

12V DC Power Supply - uses 12V 5A transformer

Dual 12V Power Supply

Dual 12V Power Supply

Power Supply Converted from a PC

Power Supply Converted from a PC

12V to 9V with a LM317

12V to 9V with a LM317

8A Regulated Power Supply for 13.8V

Click 8A Regulated Power Supply for 13.8V

9-V Stabilized Powersupply

9-V Stabilized Powersupply