Linear and switching power supplies circuits design

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

65W notebook laptop power adapter circuit

This laptop power adapter circuit is designed using TOP269EG off-line switcher IC, (U1), used in a flyback configuration.
TOP269EG IC has an integrated 725 V MOSFET and a multi-mode controller. It regulates the output by adjusting the MOSFET duty cycle, based on the current fed into its CONTROL pin.

Circuit Diagram: 
TOP269EG 65W notebook laptop power adapter circuit
TOP269EG power adapter transformer
TOP269EG power adapter coil
TOP269EG laptop adapter coil
Electronic Circuits: 

15V variable power supply circuit

This 15v variable power supply electronic project is designed using 2N3055 transistors. Output voltage of this variable power supply can be adjusted in the range between 1.5 and 15 volts. This 2N3055 15v variable power supply can provide a maximum current of 500 mA. Stabilization is better than 2%, if the currents do not exceed 350 mA. Voltage is set using a potentiometer, and the presence of overload is announced by an audible indication of overload.

Circuit Diagram: 
15V variable power supply circuit
Electronic Circuits: 

5v power supply LTM8021

This 5v power supply circuit is designed using the LTM8021 and will provide a maximum current up to 500mA. Almost all required parts are included in the LTM8021 package.
This 5v power supply circuit based on the LTM8021 operate over a input voltage range between 3V and 36V .

Circuit Diagram: 
5v power supply LTM8021
Electronic Circuits: 

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