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Film Capacitor materials
Film Capacitor materials
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Old 15th February 2021, 09:51 PM   #31
egellings is offline egellings  United States
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Polypropylene has lower dielectric absorption than polyester has. This would be important for an integrator, but not as important for an audio coupling cap.
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Old 16th February 2021, 07:33 PM   #32
Pasqualino31 is offline Pasqualino31
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Yes, dielectric absorption is kind of like hysteresis in a magnet. The cap with higher DA will hold more residual charge. If there are no instantaneous changes, then there are no worries.

That being said, it has no (or insignificant) harmonic effects but could affect the musical onsets and offsets (attack and decay). The funny thing is that with these amps, things in an electronic system that are considered to be "bad" often sound good.

Which cap sounds better as a coupler? I don't know. I do know that I wouldn't use a cheap ceramic cap as a coupling cap. They're great decoupling caps though.
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Old 16th February 2021, 08:40 PM   #33
Francois G is offline Francois G  United States
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Film Capacitor materials
Welcome aboard, and thanks for your contribution. We will look forward to more of it in the future.
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Old 17th February 2021, 02:49 PM   #34
NickKUK is offline NickKUK
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I don't this changes much over the years.

Just for reference: Capacitance and Capacitors | Analog Devices

What is interesting is the appearance of caps like Auricap XO - when you read the small print it's a bi-polar electrolytic but people swear by them too. All depends I suspect on your circuit and the capacitor in font of you.

To be DA simply means you get noise on the signal.
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Old 17th February 2021, 03:01 PM   #35
analog_sa is offline analog_sa  Europe
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Film Capacitor materials
Quote:
Originally Posted by NickKUK View Post

What is interesting is the appearance of caps like Auricap XO - when you read the small print it's a bi-polar electrolytic but people swear by them too.

Small print??? How did invent this nonsense?
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Old 17th February 2021, 03:12 PM   #36
TB is offline TB  United States
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Guitar Tone Capacitors, part 1: Evaluating Material Types - YouTube

This is interesting Wiki article:
Film capacitor - Wikipedia

Last edited by TB; 17th February 2021 at 03:26 PM. Reason: add another link
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Old 17th February 2021, 03:39 PM   #37
TB is offline TB  United States
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Not mentioned on the list are polyolefin film capacitors recommended as polycarbonate capacitor replacement:
Isotactic polypropylene is a polyolefin with a helical structure involving at least 50 percent crystallinity [1]. This spiral structure results in a crystallized polymer of lower density than polyethylene. Polypropylene is a stereoregular polymer which is almost 100 percent isotactic in capacitor film applications [2]. Biaxial orientation of polypropylene film overcomes the tendency of polypropylene to fibrilate when oriented and is a major reason for use of such films in capacitors
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Old 23rd February 2021, 09:44 AM   #38
jotom750 is online now jotom750  United Kingdom
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Film Capacitor materials
How about PIO?, be it paper or plastic of some sort.
Also Silver Mica gets my vote for small values bypass.
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