Opto-isolator

[vick5821]

Hey guys,

What is the function of this ' Opto-isolator' actually ? Is it like a relay ??

 

[Harald Kapp]

Some are, some not.

An optoisolator is a transistor (typically NPN) whose base current is controlled by the light output of an LED. More light -> more base current.

Google it. First hit (Wikipedia)

 

[Jotto]

They are used primarily to isolate one circuit from another. Find them in a lot of power supplies.

 

[shrtrnd]

Like Harald Kapp and Jotto said.
It's primarily to isolate a higher voltage circuit, from a lower voltage circuit.

 

[(*steve*)]

Or where there is no common ground connection.