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Linear and switching power supplies circuits design

Linear and switching power supplies electronic circuits design projects and schematics.

LM723 0-30 volts adjustable power supply

This adjustable power supply build around LM723 provides output voltage between 0 and 30 volts at a maximum current of 1 Amp. Because the standard LM723 circuit minimum output voltage is 2 volts, to the ground of the integrated circuit terminal (pin 7) is applied - 4.7 volts, using Zener diode D4. R8 resistor limits the maximum output current, which in this case is 1 ampere.

Circuit Diagram: 
LM723 0-30 volts adjustable power supply circuit diagram project
Electronic Circuits: 

LM317 variable power supply circuit project

This power supply circuit is a very simple low cost switching regulator electronic project that is based on the LM317 three terminal regulator .

Circuit Diagram: 
LM317 variable power supply circuit project
Electronic Circuits: 

3 to 12 volts step up DC converter using MAX668

Using MAX668 integrated circuit you can build a very simple and high efficiency step up converter electronic circuit. This step up converter power supply circuit based on the MAX668 integrated circuit is a high efficiency step up converter that will provide an fixed output regulated voltage around 12 volts at a maximum output current of 2.3 amperes . This step up converter circuit will provide a 12 volts output voltage from a 3.3 to 5.5 input voltage .

Circuit Diagram: 
3 to 12 volts step up DC converter circuit diagram using MAX668 ic
Electronic Circuits: 

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