Connect with us

Opto-isolator

Discussion in 'General Electronics Discussion' started by vick5821, Oct 26, 2012.

  1. vick5821

    vick5821

    700
    0
    Jan 22, 2012
    Hey guys,

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

    Harald Kapp Moderator Moderator

    9,137
    1,846
    Nov 17, 2011
    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)
     
  3. Jotto

    Jotto

    120
    0
    Aug 24, 2012
    They are used primarily to isolate one circuit from another. Find them in a lot of power supplies.
     
  4. shrtrnd

    shrtrnd

    3,665
    453
    Jan 15, 2010
    Like Harald Kapp and Jotto said.
    It's primarily to isolate a higher voltage circuit, from a lower voltage circuit.
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,175
    2,690
    Jan 21, 2010
    Or where there is no common ground connection.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-