How to build a power supply circuit

      All electronic gadget has a power supply. If you connect an LED directly to a power source, you will end up destroying the LED. So a power supply is a very important circuit in electronics.
Some persons may ask what is actually a power supply?
To make it very simple, our laptop charger, phone charger etc are all power supply. If you cut off the head of your phone charger and connect the two wires directly to a power source, lol..x your phone will instantly damage.

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