Btw, vibration itself also cause magnetic field. When the capacitor is vibrating, the electrons in the capacitor is also moving, this causes magnetic field to be created.
Well possibly Rayma means, in order to get the same resistivity of copper the cross sectional area of steel wire might need to be quite a bit larger in which case it might indeed be heavier than copper for the same resistivity.
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best for voicecoil, as I read, is Aluminium. It's not expensive but has the best figure of merit when you account for density and resistance.
In linear power supplies there are high charging current spikes, I am skeptical that magnetic capacitor leads are any kind of issue by themselves. Perhaps in phono . pre amps there is a need for extra care, even the materials of the case.
In linear power supplies there are high charging current spikes, I am skeptical that magnetic capacitor leads are any kind of issue by themselves. Perhaps in phono . pre amps there is a need for extra care, even the materials of the case.
I can't agree!
All this is for garbage.
Who needs an electrical cable that is actually a resistor?
Who wants to set fire to his house?
Who needs a radio frequency cable that is actually a loss line?
However, I will never buy such a thing.
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The FC caps I've had in the past were magnetic. I just pulled a package with a 10uF FC cap purchased from Digi-Key dated 8 Oct, 2010. It has magnetic leads and country of manufacture indicates Malaysia. P/N is EEU-FC1H100L.
I find it rather interesting. At the time i bought a few FC caps, determined they sucked and never used them again.
Are recent production non-magnetic? Can anyone confirm?
analog_sa,
I made the comment as I didn't notice the age of the post, and my understanding is that they are getting harder to find and I'm not even sure there in heavy production anymore. Plus I had seen several forum posts over the years indicating the displeasure of some that Panasonic caps had magnetic leads, which I did confirm years ago with their FM caps. The only common caps I knew to have copper leads are the ones often mentioned here, like Silmic, Nichicon Muse, etc. I have also seen some data sheets allude to a part number code indicating steel leads or copper leads as an option. It's been several years ago. Don't recall which manufacturer had that option.
I made the comment as I didn't notice the age of the post, and my understanding is that they are getting harder to find and I'm not even sure there in heavy production anymore. Plus I had seen several forum posts over the years indicating the displeasure of some that Panasonic caps had magnetic leads, which I did confirm years ago with their FM caps. The only common caps I knew to have copper leads are the ones often mentioned here, like Silmic, Nichicon Muse, etc. I have also seen some data sheets allude to a part number code indicating steel leads or copper leads as an option. It's been several years ago. Don't recall which manufacturer had that option.
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The likely cases:
Minimum Mass-- industrial tweeters, a few hot midranges: yes, Aluminum, but a pain to solder.
Mass is no big deal: most woofers "need" mass to extend the bass. Copper solders easy and reliable.
The case we can't talk about: ABsolute best conductivity/mass, Lithium. Very dangerous exposed to air.
Mine have copper leads.
They are 12 months old.
Not sure about now.
Most of the Nichicon audio caps have copper leads.
Elna Silmic RFS have copper leads.
Yes, aluminum is 1/3 as dense as copper, conductivity is 2/3 of copper. So you need 33% thicker to get the same resistance. But weight is still lower than copper. The downside would be space. Thicker wires takes up more space.
Just as a follow up, and further clarification.
My Panasonic FM capacitors have magnetic iron lead wires
The Panasonic FC capacitors, have tinned copper leads ie non-magnetic.
That is how they are with mine.
Capacitors were purchased from digikey USA, approximately a year ago.
My Panasonic FM capacitors have magnetic iron lead wires
The Panasonic FC capacitors, have tinned copper leads ie non-magnetic.
That is how they are with mine.
Capacitors were purchased from digikey USA, approximately a year ago.
Thank you. Mine are around 15 years old, bought from Digikey and definitely magnetic. It is quite possible my strong dislike for the sound is related to the leads, will have to try a new batch.
Very weird this has not been discussed before.
Yeah, that's why I thought it was worth reviving this thread.
I am also corresponding with Panasonic at the moment trying to get them to confirm which products use copper leads as of right now/today.
Hopefully have an answer within 24 hours.
I am also corresponding with Panasonic at the moment trying to get them to confirm which products use copper leads as of right now/today.
Hopefully have an answer within 24 hours.
These have ferro lead wires or other non copper material since many many years. Don’t think wires are copper when they are non magnetic.
Well if they're iron based and non-magnetic they would have to be austenitic stainless steel (or similar), which really isn't any cheaper than copper.
So kind of dumb to do that unless they were designed to be used in a marine/corrosive environment.
I know for a fact my panasonic FC capacitors have copper leads.
Happy to confirm that by scanning electron microscope if people insist they're not.
So kind of dumb to do that unless they were designed to be used in a marine/corrosive environment.
I know for a fact my panasonic FC capacitors have copper leads.
Happy to confirm that by scanning electron microscope if people insist they're not.
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Panasonic FC I purchased from Mouser in Aug 2020 has magnetic leads.
Parts# EEU-FC1C332
PS: I also find FC purchased from Mouser about 3 years ago has magnetic leads: All FCs here have magnetic leads.
Parts# EEU-FC1C332
PS: I also find FC purchased from Mouser about 3 years ago has magnetic leads: All FCs here have magnetic leads.
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I found another thread on the site from years ago discussing this topic about FC/FM and other caps so I know I wasn't crazy thinking this had been already discussed. I poured over the datasheets last night and also poured over the Panasonic website - I couldn't find any evidence of calling out the leads used on the FC caps, so maybe it's whatever they have on hand. pico, that's great if you can get an answer on the subject. I'm a bit curious now.