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Zero ohm resistor ?

Discussion in 'Electronic Basics' started by mowhoong, Nov 19, 2004.

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  1. mowhoong

    mowhoong Guest

    yesterday I brough a x'mas three kit set for soldering, But the circuit use
    four nos. of zero ohm resistor.Can any person know what is that mean, can we
    use jumper wire to substitute ? Thank you.
     
  2. peterken

    peterken Guest

    2 possibilities...
    - it's just a jumper wire to ease crossing on the pcb
    - it's used as "fusible resistor" for protection of the circuit
     
  3. Clarence

    Clarence Guest

    TOP POST REPAIRED! Ecch!


    Yes. However "Zero Ohm Resistors" are commonly used to select options or in
    some cases (since the actual resistance is about.01 ohms) as a current sense
    resistor.

    Never used as a "fusible resistor" since it will carry much more current than
    any other element in the circuit! Also, not made to open readily! A diode is
    a better fusible component.
     
  4. Zero Ohms resistors are used for wire bridges on single sided printed
    circuit boards. They are used instead of pieces of wire as they can be
    handled easier, especially by placing machines. Ever saw a board with tens
    of them. Obviously designed by a lazy or incompetent pcb designer. As these
    resistors are made to replace jumper wires, you can replace them by the
    jumper wires they replace :)

    petrus bitbyter
     
  5. rein wiehler

    rein wiehler Guest

    sounds like a jumper to accommadate single sided pbc layout
     
  6. CFoley1064

    CFoley1064 Guest

    Subject: Re: Zero ohm resistor ?
    Sorry, not quite. The old "crystal" diodes would fail open pretty reliably,
    but modern diodes frequently fail shorted, too.

    Fusible resistors have their place. The spec tells their current rating.
    Also, several manufacturers make small axial lead fuses which have the same
    form factor as a 1/4W resistor.

    Good luck
    Chris
     
  7. Clarence

    Clarence Guest

    Then YOU should use the fuse!
     
  8. Rich Grise

    Rich Grise Guest

    They are zero-ohm "jumper resistors", IOW, the zero-ohm "resistor" _is_
    the jumper wire.

    http://www.irctt.com/pdf_files/ZEROHM.pdf

    And as has been said by others, they are easier for the stuffing machine
    to handle than wires with spaghetti.

    Cheers!
    Rich
     
  9. Rich Grise

    Rich Grise Guest

    I've worked for a battery charger manufacturer, and they used "fuse wire"
    which was rated in amps, like 20, 30, 40 and so on. When they blow, it's a
    mess since molten metal drips all over everything. It handled like fat
    solder. A fusible link was generally a couple of inches, with a lug at
    each end (crimped _and_ solder-dipped =:-O ), bolted right onto the diode
    stud.

    A fusible resistor is, as he's said, a resistor that will open like a fuse.
    If what you're looking for is just fusing, then probably a fuse would be
    your best bet.

    I'm only a tech[0], but I would _never_ use _any_ component in a way where
    the things that are supposed to cause it to blow up are a part of the
    normal operation of the circuit. In other words, _don't_ use a diode where
    you're supposed to use a fuse!

    Good Luck!
    Rich

    [0] with approx. 45 years' experience, only ~10 of which were as a larva. ;-)
     
  10. hotkey

    hotkey Guest

    yes
     
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