How work ic 7805 and his constrction?

Answer:

1. connect pin #1 to source (input voltage), pin #3 to the load (output), pin #2 to ground.

2. at the input 100 uF electrolytic capacitor, at least 25V (the higher capacitance is better, its to make sure that the source will provide the energy for prompt consumption from the 7805 regulator

3 At the ouput connect 0.1uF ceramic capacitor (for noise filtering) and in parallel anoher high capacitance (at least 10uF) electrolytic capaciotr ( 6.3V or higher) also in order to provide the energy for prompt consumption from the load

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