Black = negative Cap - Page 2

janneman · 9th August 2005, 03:19 PM

Quote:

Originally posted by Calebay
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 -

Yeah well I think 9V is a little too low. Try, if necessary, with your big transformer but with a series resistor. I would also vote for the black terminal being neg pole, btw. It seems pretty standard.

Jan Didden

Peter Daniel · 9th August 2005, 03:21 PM

Quote:

Originally posted by Netlist
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.

/Hugo

Skinned electrolytic caps (in loving memory of Fred D.)

Netlist · 9th August 2005, 03:24 PM

That's the one, Peter. Seems you don't need the search engine, you know the threads from memory.

/Hugo

Peter Daniel · 9th August 2005, 03:25 PM

Actualy I remebered that Moamps used the name Fred in this thread, and this is how I did my search.

Netlist · 9th August 2005, 03:31 PM

Leaves us with the question: Is the inner or outer foil + or - ?
Or should I re-read the thread?

/Hugo

Calebay · 9th August 2005, 04:52 PM

yep also got a cap thats says negative = black

i did the test agin this time using 2 9v batt in serie ´Better

the black was negative

i also tried using the scope test. but no luck whit that one don't know what i did wrong..

tnx for the help

9th August 2005, 03:25 PM	#14
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Actualy I remebered that Moamps used the name Fred in this thread, and this is how I did my search. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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9th August 2005, 03:24 PM	#13
Netlist diyAudio Moderator Join Date: Jan 2003	That's the one, Peter. Seems you don't need the search engine, you know the threads from memory. /Hugo

9th August 2005, 03:31 PM	#15
Netlist diyAudio Moderator Join Date: Jan 2003	Leaves us with the question: Is the inner or outer foil + or - ? Or should I re-read the thread? /Hugo

9th August 2005, 04:52 PM	#16
Calebay diyAudio Member Join Date: Jul 2003 Location: Denmark	yep also got a cap thats says negative = black i did the test agin this time using 2 9v batt in serie ´Better the black was negative i also tried using the scope test. but no luck whit that one don't know what i did wrong.. tnx for the help

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