Variable Switching Power Supply Schematic. Mains voltage goes first through an emi interference filter. It is then rectified using a bridge rectifier and smoothed using capacitor c4.
Due to high capacity there s an inrush limiting circuit with re1 relay contact and r2 resistor. A power supply is an essential device when you are working with electronics. The rectified output is filtered by 1000 capacitor c 1.
Mains voltage goes first through an emi interference filter.
Diode d3 is incorporated for protection of the ic. Simple variable 0 30v 2a for beginners. Ic3 2 will compare the voltage at both pins if reference voltage has too much the output of ic3 2 will be a switching pulse the square wave pulse that has many duty cycle range. Variable regulated power supply using 7805 and op amp.
