This is an electronics discussion group. It will die if we don't discuss electronics. Like, if all people like you post is home woodworking problems and redneck political links.
And neither of my questions are stupid. Both could matter; right now, to me, both do matter.
--
John Larkin Highland Technology, Inc
picosecond timing precision measurement
The resistors are just the usual lowish-tempco metal-filled enamel, slathered on thick without laser trimming.
Multilayer beads/coils are probably something like Cu/Ag/Pd, applied as a ceramic glaze formulation that bakes into mostly-solid metal on heating. Noble metal content is needed, otherwise the ferric iron (a required part of a _ferri_te) oxidizes it, destroying the contact. Not to mention making the ferrite terrible (too much Fe(II) would probably crystallize as magnetite, which sucks).
Caps have the same construction, but they get away with semiprecious metals more effectively as they only have to carry displacement current. The metal layers can be very thin indeed.
The end of this unit's left terminal looks like a plated copper strap:
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But it looks almost like that guy's strap was inserted into a completed ferrite bead, then bent; the ferrite units in my stock look like the ferrite was formed in place around the strap. No seams.
I can't remember but it should be easy to test for. I think our main problem was in the coil lead of a relay. I've seen them open up in other applications so I try not to use them. Typically I only use them for "options" on a PCB anyway.
Another thing regarding small-ish parts like these is that, for all resistors, say less than a hundred Ohms, should be "pulse rated"... meaning, they shiould at least publish the overload specs for the resistors unless there is just very very low current through them. It's a rule my company has adopted though.
It may be that the zero ohm resistors we have used were not made by Vishay or Stackpole or one of those companies that specify a decent maximum repetitive pulse power.
This is especially important for gate drive resistors where a capacitor is charged and discharged rapidly.
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