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Thread: Inductor

  1. #1
    Join Date
    Jul 2010
    Location
    Bowmanville,Ontario,Canada
    Posts
    50
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    Default Inductor

    Hi everyone,
    Looking for someone to help me understand something I am seeing on a circuit board I am working on. There is an optocoupler (pc817) that has the Anode coupled to the +5vdc rail with 4.7k ohm resistor which I get but the Cathode looks to have an Inductor in series with the connection terminal. Actually I'm not sure it is an inductor other that the silkscreen gives it an "L" designation. Also being SMD parts there are no makings to go by. Would they use an inductor as a choke to limit the false triggering of the circuit due to a noisy environment?
    Thank you
    Rick
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  2. #2
    Join Date
    Nov 2009
    Location
    Brisbane - Australia
    Posts
    958
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    Default Re: Inductor

    My guess is that it's a ferrite bead, although it's unusual to see one in series with an opto LED.
    www.da-share.com

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