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Thread: electronics question: what component is marked "L1" on a pcb?

  1. #1
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    electronics question: what component is marked "L1" on a pcb?

    Hey all,

    I have googled around for this one, but no love. If I have a board with an obviously broken surface mount component, with an adjacent label "L4" on the pcb, what is it? (I know eg. "R1" is a resistor, etc.)

    Also, I read a document about "pull-up resistors." Is the pull-up resistor the whole circuit?

    eg.
    Code:
    vcc
      |
      \
      / R = 47k
      \
      /
      |
      |
     /      |\
    / .-----| }o----
      |     |/
      |
    gnd
    Or is it a special kind of resistor? Or is it just a normal resistor, but in the context of such a circuit? Ie. if I bought one, I would just buy a normal 47k resistor, right?

    Thanks,
    Timothy

  2. #2
    Join Date
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    Re: electronics question: what component is marked "L1" on a pcb?

    L usually designates an Inductor, http://en.wikipedia.org/wiki/Inductor

    Has it got a value written on it?
    Last edited by mips; May 5th, 2009 at 09:13 PM.

  3. #3
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    Re: electronics question: what component is marked "L1" on a pcb?

    I agree on the inductor.

    Good luck.

  4. #4
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    Re: electronics question: what component is marked "L1" on a pcb?

    As the others said, the L4 should (normally) be an inductor.

    And a pull-up resistor is just an ordinary resistor - it's the application that makes it a "pull-up". Without it, the logic input or whatever-it-is could float at whatever random voltage between logic-low and logic-high when not grounded. It's possible it wouldn't float high enough to be seen as a "high". The resistor makes sure it goes high by "pulling up" the voltage on the pin when not grounded.

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