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Old 5th October 2018, 12:10 AM   #21
PRR is offline PRR  United States
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Quote:
Originally Posted by goodguys View Post
.... I do not want to pay more for a capacitor just to pay for a higher voltage rating that i shall never use.....
The problem is: how *THIN* is 5V or 50V of Teflon? Incredibly thin. Too thin to handle. Too thin to make without defects.

There is a minimum-COST thickness for plastic film. Thicker costs more for the plastic. Thinner costs more for the care in manufacturing and handling.

Bulk Teflon is good for 60MV (MegaVolts) per meter. Working that out in furlongs, a 6V film would be 0.000,004 inches.

Here's a source for Teflon film. A 25' roll of 0.0005"TeflonŽ FEP Film x 24" is not real expensive. By my figuring, 0.0005 is good for 760 Volts, would perhaps be sold as 200V in a cap. Thinner film is not readily available--- oh, here's 0.000,4" stuff and 0.000,2" (GF40964058) (expensive!).
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Old 5th October 2018, 07:37 AM   #22
goodguys is offline goodguys  United Kingdom
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Originally Posted by Andersonix View Post
Thanks for trying, but those are way too large and a bit expensive.
That is what they are all like. I purchased some and they were massive.
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Old 5th October 2018, 07:54 PM   #23
Andersonix is offline Andersonix  Sweden
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capacitor source lookng for
I'll just stick with metallized polypropylene, and forgo the jump from K=2.1 to K=2.0.
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Old 7th October 2018, 05:18 PM   #24
Vovk Z is offline Vovk Z  Ukraine
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As it was said, cheap (and good) crossover film caps are motor ones (they are made of poplypropylene, usually).
And I haven't heard about 5 or 10 V rated film caps - they start fron 50 V.
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Old 10th October 2018, 11:19 AM   #25
wolf_teeth is offline wolf_teeth  United States
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Due to the voltage swings and transients in music, it is preferable according to someone I trust that capacitor voltage in speakers should not be rated below 100V, and that due to +/- AC voltage swings in music, that 250V are really closer to ideal.

You have to realize that arcing can occur in a capacitor that is not rated at a high enough voltage when frequency cycles increase, such as in tweeters. I heard this from a capacitor engineer at Plastic Capacitors, which is a sister company to Arizona Caps, and a manufacturer of high voltage products.

If I could find the article my source attached when I read this before, I would link it here. He is knowledgeable, employed by and has consulted for, many audio companies; as well as builds his own amplifiers.

One last bit of info- you need to size capacitors under use generally at the 4x rating required in terms of voltage. This also ensures reliability.

I would not use a 5VAC cap in a speaker- ever. 100V minimum, 250V ideal, and higher is better internal contact and lower ESR.

Later,
Wolf
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Old 15th October 2018, 10:01 AM   #26
shreekumar is offline shreekumar
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Default Original manufacturer of radial cap

Hello

Pls identify the ,manufacturer of the capacitor in the attached photograph,
It's a 333k and 104K, 50v Polyproplyne cap.
Pls identify the brand/manufacturer with the logo
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