Metal lead found ?

[mowhoong@hotmail.com]

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?

 

[John Popelish]

mowhoong@hotmail.com wrote:

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?

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.

 

[Art]

Nominally the component leads are a steel compound, therefore magnetically
influenced.
"John Popelish" <jpopelish@rica.net> wrote in message
news:hMCdnaIabvH7ME3fRVn-hw@adelphia.com...

mowhoong@hotmail.com wrote:
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?

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.

 

[Jamie]

mowhoong@hotmail.com wrote:

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?

copper clad conductor possibly ?

--
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

 

[Peter Bennett]

On 9 Jul 2005 21:49:27 -0700, "mowhoong@hotmail.com"
<mowhoong@hotmail.com> wrote:

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?

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.)


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
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