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What is use of capacitors in 7805 ?

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snishanth512

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7805-w-caps-schem.jpg

What is the purpose of capacitor in the diagram?

Are the capacitors chosen at random?
 

Tahmid

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They are bypass/decoupling capacitors.

Check this: https://www.edaboard.com/thread269757.html
and this: http://en.wikipedia.org/wiki/Decoupling_capacitor

Are the capacitors chosen at random?
Not completely randomly, but not through exact calculations either. The values aren't too critical, so a wide range of capacitors can be used.

By the way, you should have 0.1uF capacitors, preferably ceramic, across the 2 capacitors shown in the circuit diagram.

Hope this helps.
Tahmid.
 

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