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Old 5th August 2004, 11:00 AM   #1
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Default film vs. electrolytic

Hi,

Is there any other benefit of using electrolytic condenser instead of a film condenser in power supplies other than price ?

Particularly, if price is not an issue, do you always prefer a 47uF metallized polypropylene (e.g. solen) to 47uF electrolytic ?

Thanks...

MB
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Old 5th August 2004, 11:32 AM   #2
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If price and size aren't factors, go with the Solens or motor run caps. Even putting a cap's sound aside, mkp's and motor run caps will prove more reliable over time.
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Old 5th August 2004, 12:12 PM   #3
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There is lots of bad sounding metalised caps out there. Not too many beat BGs IMO.
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Old 5th August 2004, 12:15 PM   #4
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The other advantage of using large, expensive film or oil-filled caps is reliability. Good ones will outlive you.
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Old 5th August 2004, 05:02 PM   #5
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Film caps have very low esr, is that the reason of their long life ?
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Old 5th August 2004, 06:14 PM   #6
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No, it's a matter of chemical and thermal stability.
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Old 6th August 2004, 06:27 AM   #7
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Is there any maximum ripple current specification for film condensers ?
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Old 6th August 2004, 09:40 AM   #8
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Is there any need for bypassing film capacitors with low valued film capacitors ?
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Old 6th August 2004, 11:29 AM   #9
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In order:

1. Yes. Most spec sheets will give this figure.

2. That's a matter which needs to be examined case by case. No universal answer.
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Old 6th August 2004, 11:44 AM   #10
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Thank you all for the answers...

MB
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