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Old 5th February 2007, 01:55 PM   #1
spencer is offline spencer  Hong Kong
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Default Aerovox film capacitor

Any body know what is this film capacitor, PP or PS type? Any date sheet could be found?

Marking on body:
APC 30uF
240-0300
M/150 VAC
Assembled in Mexico

Thanks.
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Old 5th February 2007, 02:15 PM   #2
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A complete guess would be that it is a custom design for an APC uninterruptible power supply.
It doesn't seem to exist in the Aerovox catalogue although it may be an old type or pre ROHS.

http://www.aerovox.com/pdf/DC_Film_Axials.pdf
Cheers,
Martin.
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Old 5th February 2007, 02:53 PM   #3
spencer is offline spencer  Hong Kong
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Thank you Martin,

The plastic is dark blue and how can I know if it is Polyester or Polypropylene type? Thanks.
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Old 5th February 2007, 04:38 PM   #4
poynton is offline poynton  United Kingdom
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Why do you think it's Aerovox???
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Old 5th February 2007, 04:45 PM   #5
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Likely because Aerovox has a plant in Mexico that manufacturers foil capacitors.
Ping

For the voltage rating my guess would be GE.
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Old 5th February 2007, 04:48 PM   #6
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Quote:
Originally posted by spencer
The plastic is dark blue and how can I know if it is Polyester or Polypropylene type? Thanks.
Hi Spencer,
You can't really tell from the outside in this case I'm afraid.

You could measure capacitance change with temperature but it's not very practical.
I guess you'll just have to listen to them unless someone has any other ideas?

The Aerovox PDF does show that they use dark blue plastic.
(Not exactly exclusive to them but......)

Cheers,
Martin.
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Old 5th February 2007, 04:52 PM   #7
Apex Jr is offline Apex Jr  United States
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I have some metalized polyprop caps made by Aerovox outer jacket is white also AC caps NP, Great caps ...

Steve @ Apex Jr.
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Old 5th February 2007, 10:46 PM   #8
spencer is offline spencer  Hong Kong
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The shop can show a box outsite with Aerovox printing but they got no idea what is the part number as there is no other label. Price is reasonable and thus I took 20 pcs to try.

I am listening them in my Jefet IV output coupling and it sound quiet good. Still breaking-in to third day.

Thanks,
Spencer
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Old 6th February 2007, 11:36 AM   #9
spencer is offline spencer  Hong Kong
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Martin,

Thanks for your charts and I figure out how to check whether the cap is PP and PS. The answer is Polyester as the capacitance increase with higher temperature.

Tools are capacitance meter and hot hair blower.

Spencer
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Old 6th February 2007, 11:05 PM   #10
Magura is offline Magura  Denmark
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The way to make sure what type of cap it is, is to take one apart and set a bit of the film on fire. Then blow out the flame and smell if the smoke smells sweet like a candle, then its a PP cap, polyester smells totally different, so does polystyrene.

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