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Old 19th October 2006, 11:15 AM   #1
Dxvideo is offline Dxvideo  Turkey
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Default Capacitor quesiton..

Hi all,
I'm here for another stupid question again...!
As i see many manuals, they say "use Mylar or Metal capacitors for signal coupling." First of all; whats the mylar capacitor? I cannot find any mylar or metal capacitors in Turkey or i couldnt tell the salesmen them! Can i use standard electrolityc capacitors for coupling? What diffenence it makes?
Thanks a lot for your answers in advance...
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Old 19th October 2006, 11:58 AM   #2
Stuey is offline Stuey  Australia
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Hi Dx,

I'm pretty sure Mylar is someone's trademark for the generic term polyester. Metal would mean metal film, or either metallised polyester or polypropylene most commonly.

Most people think that film caps provide a better quality of sound when in the signal path.

Stuey
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Old 19th October 2006, 01:23 PM   #3
Dxvideo is offline Dxvideo  Turkey
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Thank you Stue. I hope its easy to find metal film capacitors... Ill use metal films as you say.
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Old 19th October 2006, 01:46 PM   #4
Stuey is offline Stuey  Australia
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Hi Dx,

Note that there's a difference between metal film and metallised. You'll find metallised (eg. metallised polypropylene) are more common and are usually the type used in most reasonable quality amps.

I believe metal film are quite expensive and more difficult to get.

Stu
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Old 9th November 2006, 04:07 AM   #5
Fin is offline Fin
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So - would these be good (in our part of the world)??
http://cgi.ebay.com.au/Capacitor-Met...QQcmdZViewItem
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Fin
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Old 9th November 2006, 06:28 AM   #6
Nordic is offline Nordic  South Africa
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Noting special about those, but they would work...
Being Mylar is not so important, what is important is to note that it is a non polar cap, unlike elctrolitics... So any non polar cap of the right value would work, mylar, polyester, polypropelyne, ceramics all work the same way, except for diffiring levels of linearity... Ceramics should be avoided unless it is NP0 or COG types

But film caps are generaly better than ceramics

The mylar references probably comes from older schematics, various forms of polyprop and polyester has taken over since then in terms of production cost and performance.
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Old 9th November 2006, 11:41 AM   #7
Stuey is offline Stuey  Australia
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Not that it really matters, but as I say mylar IS polyester - it's a DuPont trademark.

http://heritage.dupont.com/touchpoin...overview.shtml
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Old 10th November 2006, 07:19 PM   #8
Minion is offline Minion  Canada
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I"m pretty sure "Mylar" and "Metal Film" and the same thing, Mylar is just a Trademark name for metal film or metalized polyester....

I"m sure we have all seen those shiney silver Balloons , Well those are made from Mylar which you can easily tell from looking at one that it is made from a Metalized Plastic ,They also use the same type of material for packaging materail like on chocolate wrapers and chip bags and very thin mylar for condenser microphone diaphrams......

You can get Metal Film Capacitors for pretty darn cheap these days ,I recently bought 100 0.1uF metal Film caps for $3 and they are quite small.....


Cheers
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Old 10th November 2006, 10:27 PM   #9
CarlosT is offline CarlosT  United States
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Is it generally true that non polarized caps can be substituted in any application that calls for polarized caps with no ill effect?

I've been perusing some old tube amp/guitar amp webshops and there are a lotta "old school" capacitors showing all claiming to have that old warm sound from who knows when. All have cool names like:

Orange Drops

Atoms

Black Cat

Tiny Chief

Black Beauty

Cute...innit?
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Old 10th November 2006, 11:35 PM   #10
Stuey is offline Stuey  Australia
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Does anyone read the previous posts on this forum?
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