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Old 25th May 2004, 12:00 PM   #21
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How about Teflon film and copper foil? Check out McMaster Carr. Teflon film is on page 3334, copper foil on page 3435.

Peace,
Sanaka
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Old 25th May 2004, 03:09 PM   #22
Krist is offline Krist  Sweden
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Quote:
Originally posted by Magura
The main purpose of the oil is to increase the heat transfer. The voltage is determined by heat and when the cap sparks over. The foil thickness determines the load the cap can take...I think.

Magura

Now i'm confused. I thought that capacitors diden't get hot at all unless they had high ESR, in wich case they are broken or if too high voltage causes arcing. Can someone please explain?
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Old 25th May 2004, 09:09 PM   #23
markp is offline markp  United States
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If you are going to use paper, use 'craft' paper and not notebook paper. The 'craft' or brown wrapping paper has less void area and can take higher voltages without sparking over. Cling wrap is not good for high voltages or high values as it melts and is too thin for stability. Use un-metallized mylar from window tinting for a really good dielectric.
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Old 25th May 2004, 09:23 PM   #24
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Does anyone know if shellac would be a good dielectric?

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Old 25th May 2004, 09:46 PM   #25
markp is offline markp  United States
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Quote:
Originally posted by Bas Horneman
Does anyone know if shellac would be a good dielectric?

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Bas
No, it cracks and is prone to static electricity.
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Old 25th May 2004, 10:11 PM   #26
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No, it cracks and is prone to static electricity.
Bummer!

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Old 26th May 2004, 01:12 AM   #27
Tensop is offline Tensop  Lebanon
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i tried the monitor thing and it didnt work, bah
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Old 26th May 2004, 01:20 AM   #28
Magura is offline Magura  Denmark
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Quote:
Originally posted by Krist



Now i'm confused. I thought that capacitors diden't get hot at all unless they had high ESR, in wich case they are broken or if too high voltage causes arcing. Can someone please explain?

An ideal cap dont get warm.....ideal caps are real hard to come by

The loss have to go somewhere....in this case its heat.


Magura
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Old 26th May 2004, 01:28 AM   #29
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Quote:
The loss have to go somewhere....in this case its heat.
that goes for most things doesnt it? I mean electronic things dont generally move about too much so the only outlet for inefficiencies would be heat

Quote:
i tried the monitor thing and it didnt work, bah
i think this is something theyve 'fixed' with modern monitors and tv's. they dont seem to get any static on the screen

Steve
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Old 26th May 2004, 01:59 AM   #30
Rarkov is offline Rarkov  England
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Except for valve & class A amps, that are inefficient heaters, and that inefficiency outlet is sound!

Gaz
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