Hello i know that some years ago same topic was started, but which no answers, and it is closed for now. So did any body tryed, or compared chinese u cap? Is it realy made from copper foil and teflon? Dimensions and weight is near v cap cutf version. Please help me.
Yes it i write Mexico bud dont know what it mean. They can be bought on aliexpress or on ebay for 100$ for 1uf 600v cap. Have any one have them?
Which "them"? It common for different, cheaper, items to be substituted on a re-order for nominally the same item. If you need copper/PTFE, buy from a supplier who wlll supply whats on the datasheet (oh yes, is there a datasheet?), else expect to be fleeced (then you won't be dissappointed).
I would compare the dielectric strength of Teflon and polyester film (which I think is the normal dielectric material), and insist on a datasheet from a traceable manufacturer, with ISO details.
The ISO certification means a lot of QC is in place, and the maker is actually making them in a way that is recorded.
And I think copper is a lot less flexible than the metallized film normally used in capacitors.
The things are said to be hand made, further cause of inconsistent quality.
I am skeptical, but without actual user feedback, hesitant to call it snake oil.
The ISO certification means a lot of QC is in place, and the maker is actually making them in a way that is recorded.
And I think copper is a lot less flexible than the metallized film normally used in capacitors.
The things are said to be hand made, further cause of inconsistent quality.
I am skeptical, but without actual user feedback, hesitant to call it snake oil.
Maybe Copper does not oxidize, and can be rolled thinner than Aluminum?
As a non magnetic material, yes.
But that would lead to a never ending debate.
Like the use of hemp and silk fibers in audiophile capacitors, that subject has many opinions about it.
As a non magnetic material, yes.
But that would lead to a never ending debate.
Like the use of hemp and silk fibers in audiophile capacitors, that subject has many opinions about it.
Copper oxide is a semicoductor, aluminium oxide is an insulator, you might worry about non-linear effects with CuO perhaps? Though I suspect oxidation inside a cap is minimal.
Any moisture-absorption in a dlelectric material leads to higher losses and capacitance drift as water molecules are very polar and mobile and have a large dilelectric constant that varies markedly with frequency. Its no accident PE, PP, PS and PTFE are low loss dielectrics, they absorb very little moisture as they are non-polar polymers. Hemp and silk are moisture absorbing so make poorer choices for a dielectric.
Any moisture-absorption in a dlelectric material leads to higher losses and capacitance drift as water molecules are very polar and mobile and have a large dilelectric constant that varies markedly with frequency. Its no accident PE, PP, PS and PTFE are low loss dielectrics, they absorb very little moisture as they are non-polar polymers. Hemp and silk are moisture absorbing so make poorer choices for a dielectric.
Very thanks for lots of informations, but this dont help me at all. The question is to persons that have this u cap and have compared to other cap.
$100.00 for one capacitor...I didn't know I was rubbing shoulders with the wealthy elite! Sheesh...I wouldn't pay that much for ten of them...ridiculous.
Mike
Mike
Ha! I missed that.
I assumed this was a cheap alternative.
OP should have posted a link - I can't find anything that comes even close to that price.
I'd like to see it just for a laugh.
I assumed this was a cheap alternative.
OP should have posted a link - I can't find anything that comes even close to that price.
I'd like to see it just for a laugh.
So you want to read someone's comparison of this and other capacitors, even though the rest of their system may be totally different from yours? I admit I don't have the best Golden Ears, but my ears aren't discerning enough to be able to tell whether a difference in sound between two systems is due to the capacitors or what.
I did find a couple of links:
https://www.aliexpress.com/i/2255801096595049.html
http://www.ucap-audio.com/ucap.html
I think I'll stick with Digikey and Mouser, and not go looking for "audio" capacitors.