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k how do i tell polarity on a capacitor

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k how do i tell polarity on a capacitor

Unread postAuthor: JDP12 » Sun Nov 25, 2007 3:11 pm

K so i stripped my disposable camera and am waiting to go to radio shack.. but how do i tell the polarity of my capacitor? There are no colored leads- just metal ones. can i just try one config and then the other or will that fry it?

And does a multimeter tell wire polarity?

Thanks guys
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Unread postAuthor: Ragnarok » Sun Nov 25, 2007 3:20 pm

Normally they're marked on the outside with minus signs for the negative end.
A new cap can be identified by the length of the legs, but that's no good here of course.
Putting it in the wrong way round will fry it and a multimeter is next to useless for it.

Look on the casing. If it's clear from that, great. If not, it gets REALLY hard to tell AFAIK.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: bluerussetboy » Sun Nov 25, 2007 3:31 pm

negative polarity should be indicated by a stripe or arrow. occasionally the shorter leg is the negative.
i'm not an expert, but if you were to google photoflash capacitor polarity you wil probably come up with a lot of info.

edit: i must be a real slow typer

here's a link to a pdf on rubycon aluminum electrolytic capacitors.
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Unread postAuthor: JDP12 » Sun Nov 25, 2007 6:15 pm

k thanks yea there's a stripe on the side of the cap.. thanks guys
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