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Old 27th March 2009, 04:31 AM   #1
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Default How to use this capacitor?

I have a few piece of capacitor as shown in the pic :

Click the image to open in full size.

the centre pin suppose to be 'positive' and the 3 pins attached to the aluminium can is suppose to be 'negative'? can anyone confirm?

i need to connect these caps to a negative rail. is it ok to connect the -ve voltage to the pin which is also the aluminium can?
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Old 27th March 2009, 12:42 PM   #2
amc184 is offline amc184  New Zealand
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I've seen some similar ones in some old Philips CD players (CD150, CD350). The case was negative, centre pin positive on the ones I saw too.

There is no electrical reason not to use them to decouple a negitive supply, but you might want to put an insulating sleeve over is, like appropriate sized heatshrink.
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Old 27th March 2009, 01:48 PM   #3
h_a is offline h_a  Europe
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I would not use a polar cap without polarity markings or a datasheet.

See, if you put it in in reverse and load it with large currents you risc that the cap explodes or that at least the body is deformed.

As the cap is already very old (10years+), why use not a new one? Or is it a magical type?

Have fun, Hannes
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Old 27th March 2009, 04:23 PM   #4
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Case is always negative connection, nature of law.
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Old 27th March 2009, 04:47 PM   #5
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Quote:
Originally posted by h_a
I would not use a polar cap without polarity markings or a datasheet.

See, if you put it in in reverse and load it with large currents you risc that the cap explodes or that at least the body is deformed.

As the cap is already very old (10years+), why use not a new one? Or is it a magical type?

Have fun, Hannes
Hi h_a, i am very sure that the case is -ve. but usually the -ve pole of caps does not connect to casing. if it is used in a +ve rail, the casing would go to ground, which leave nothing to worry about. however, i am going to use these in my -ve rails, hence the can will be connected to a voltage....so i wonder if this is appropriate.

i got these caps new, unused....are they that old?
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