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Metal lead found ?

Discussion in 'Electronic Basics' started by [email protected], Jul 10, 2005.

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  1. Guest

    When i am solding my hobby kit( a AM radio), i drop the 8 ohm speaker
    on the fioor, surpise me the magnet in the speaker pick up the resistor
    lead. My question is, are they using metal to substitute on the copper
    lead to cut cost?
     
  2. Components that are sealed in glass bodies, like small diodes need
    leads that have a low expansion coefficient to not crack the glass
    during manufacture and soldering.

    But many other electronic components have had iron alloy leads for
    some time, rather than tinned copper. I think they conduct the heat
    of soldering less than copper leads, but are still an insignificant
    resistance in series with the component. The lead wires also have to
    be welded onto the metal end caps on the ceramic rod core of the
    resistor, so the alloy may be chosen to weld well. They are probably
    cheaper, too.
     
  3. Art

    Art Guest

    Nominally the component leads are a steel compound, therefore magnetically
    influenced.
     
  4. Jamie

    Jamie Guest

    copper clad conductor possibly ?
     
  5. Copper is normally considered to be a metal - perhaps you mean "iron
    or steel".

    Based on a quick test of some components on my workbench, resistors
    seem to have non-magnetic leads, while ceramic capacitors have
    magnetic leads (Our stores group does stock some components that are
    specifically described as "non-magnetic", since electronics in many of
    the experimental setups may be in fairly strong magnetic fields.)


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    Peter Bennett, VE7CEI
    peterbb4 (at) interchange.ubc.ca
    new newsgroup users info : http://vancouver-webpages.com/nnq
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