Question

any1 knows how to use an optocoupler??

Answer 1

there are many applications for optocouplers; what are your needs ?

Answer 2

to couple one part of the circuit to other

Answer 3

@kashyapbharat48

my question was not for joking: in some applications you need to detect an object, in other applications you need to transfer a digital signal (high frequency, low frequency ?), in some applications you need to transfer an analog signal, etc, etc, so what ?

Answer 4

some reference:
http://www.avagotech.com/pages/en/optocouplers_plastic/

Answer 5

to transfer a digital signal