We throw stacks of CRT TV's away because of water damage....pot plants on top of them...all caused by the customer watering the pot plant with too much water and that runs into the tv etc,etc.
Doesn't happen any more, because you can't put plants on top of LCD sets
But the result of that is you will NEVER get anything done, steel wires in components have been commonplace for decades, and it's crazy imagining magnetic and skin effects etc. As for your 1.01A suggestion, that's just as crazy - it's within 1%, which is likely to be considerably better than the tolerances of any components involved.
Look at an old CRT TV PCB that's been out in the rain or water damaged in some way, it's VERY common for the component leads to be rusted, because they are steel and not copper - it makes no difference.
MrAl, you raise some interesting points.
I have previously noticed magnetic connecting leads, usually on semiconductor devices such as transistors and three terminal regulators.
I had a look at a random sample of my stock of resistors and I did not find any magnetic leads.
However all the resistors which I tested had something magnetic within the body of the resistor. I assume that this is the end caps which connect onto the ceramic former of the resistor where the carbon or ceramic film is deposited.
I have no idea of the effect of the magnetic leads in the impedance of the resistor, if this is something you wish to study further, don't forget that the resistor is "adjusted" during manufacture by laser etching a spiral in the carbon/copper film. This in itself will have a small amount of inductance.
A quick examination of other components showed that some electrolytic capacitors had magnetic leads, as had some quartz crystals.
JimB
John mentioned that the resistor body itself could be semi inductive, and because of that it might swamp any lead reactance. Makes a lot of sense.
Why would a steel wire have any different reactance to a copper one?, and no disrespect, but I'm even more baffled by your concern over steel vs copper when you apparently didn't know about the often inductive nature of resistors? - presumably you're not a radio ham?.
Any conductor has inductance, that's what a 'lecher line' is - simply a straight conductor, used as an inductor - they make them out of any kind of conductor, including copper PCB traces.
My 'concern' over this issue is you're decades too late to be discussing it - it's nothing 'new' it happened well before the end of the last century
With the advent of high speed automatic insertion equipment, component leads were slowly upgraded to steel alloys. The keyword is ALLOYS. Steel properties change dramatically with alloying materials.
For instance, stainless steel is non magnetic.
Steel does not adhere to solder, therefore they are are plated with a barrier metal (typically nickel) to which 100% matte tin is applied.
This improves many aspects of automatic insertion, while also lowering costs.
Copper is still used whenever the lowest resistivity or highest heat conduction is required.
For instance, stainless steel is non magnetic.
That's not always true. See the 400 Stainless series. https://www.pennstainless.com/stainless-grades/400-series-stainless/
Has anyone in this thread established that SS is actually used in leads?
1) I can't see any reason for doing that.
2) It work hardens quite easily and some grades can become so hard that HSS and even carbide tools don't cut it.
John
This thread was about ordinary resistors, not some special purpose device for which you don't have any details.... Vishay sells a "Metal Strip" resistor made of a proprietary mix that includes at least iron and chromium which i think qualifies it as a stainless steel, but they dont seem to want to release the entire list of metals included.
That is the reason I mentioned that steel properties do change significantly with alloying materials.That's not always true. See the 400 Stainless series. https://www.pennstainless.com/stainless-grades/400-series-stainless/
I only mentioned the SS as an example of how common steel properties change significantly with alloying. I didn't mean that it would be used as a resistor lead material.Has anyone in this thread established that SS is actually used in leads?
John
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