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Old 9th August 2005, 12:58 PM   #1
Calebay is offline Calebay  Denmark
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Question Black = negative Cap

Hello

i have 4 older caps 22000uf 80V from a sony ES power amp

but i have no idear what is + and -

Black= negative or is it the other way araund? see pic if that help


Tnx
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Old 9th August 2005, 01:01 PM   #2
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Do you have any text printed on the can?
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Old 9th August 2005, 01:10 PM   #3
Calebay is offline Calebay  Denmark
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this is all it says
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Old 9th August 2005, 01:38 PM   #4
Electrons are yellow and more is better!
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Take a DVM and measure the resistance between the terminals and case. Normal negative is more or less connected to case.
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Old 9th August 2005, 02:27 PM   #5
Calebay is offline Calebay  Denmark
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im not able to measure anything infinity resistance

anything else i can try before i connect my 450VA trafos?
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Old 9th August 2005, 02:42 PM   #6
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Try it with a 12V trafo through a resistor of say 100 ohms first to see if the caps are connected correctly. If not, you will see a very large current resulting in low voltage at the caps. Can you measure voltage? And oh, btw, you didn't mention the rectifiers, but you have those too?

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Old 9th August 2005, 03:26 PM   #7
Calebay is offline Calebay  Denmark
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okay ill try that first yes i have a multi meter i did try to measure the but it seems like the non of the terminals have any connection to the case at all..


don't worry i have rectifiers in there as well i have build an amp before
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Old 9th August 2005, 04:06 PM   #8
Calebay is offline Calebay  Denmark
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okay i did this test using a 9v batt instead i connected my multimeter in serie whit the batt. to measure the current

when i connect it to the cap the same this happens no matter if its + or - it draw a large amount of current the first few seconds, then drop to zero. seems normal..

i also try to measure the voltage over the cap after its been charged. its drop for 9 volt slowly. the same speed + and -
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Old 9th August 2005, 04:11 PM   #9
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Maybe this helps:
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Old 9th August 2005, 04:13 PM   #10
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Somewhere on the board there's a clever post how to measure polarity with a scope, looking at dropping waveforms. I can't however remember who posted it, when and where.

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