Self switching power supply

The hardware requirements of the self-switching power supply include a transformer , rectifier, filter, regulator, relay, a transistor (BC547, BC557), Resistor, Capacitor, 1N4007.

Self-Switching Power Supply Block Diagram

Step down Transformer

Step down transformers secondary voltage is less than its primary voltage

It is mainly designed to reduce the voltage from the primary winding to the secondary winding

The transformer changes the high voltage, low current power into low voltage, high current power

Step down Transformer

Transistor (BC547, BC557)

The BC547 transistor is an NPN Epitaxial Silicon Transistor.

The BC547 transistor is a general-purpose transistor in small plastic packages.


It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN general-purpose transistors.

Whenever base is high, then current starts flowing through base and emitter and after that only current will pass from collector to emitter

The BC557 transistor is a PNP Epitaxial Silicon Transistor


The BC557 transistor is a general

Compétences : Génie Électrique

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