Radio Spares 10,000uf polarity markings - diyAudio
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Old 2nd June 2011, 06:39 AM   #1
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Default Radio Spares 10,000uf polarity markings

I have a Radio Spares Capacitor63v 10,000uf with no apparent polarity marking. Rather it has 5 terminals on its top, with a number sequence of 1, 2, 3, 4 Has anyone a data sheet or polarity identification info.

Cheers / Chris
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Old 2nd June 2011, 08:47 AM   #2
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Have decided to dispose of them, as it is ridiculous this capacitor has no polarity markings.
I have contacted radio spares, in a last ditch attempt to identify.

cheers / Chris
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Old 2nd June 2011, 09:30 AM   #3
Luke is offline Luke  New Zealand
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some times the rivet that holds the -ve tab on is black. Use a meter to find which are the two active pins.
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Old 2nd June 2011, 10:26 AM   #4
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Hi Luke
No there is nothing that identifies polarity other than a number sequence 1,2,3,4. I suspect Radio Spares originally sold these with a connection information sheet. I will try 5v DC current limited to 5ma , and see which terminals hold a charge.

Thanks for your interest
Cheers / Chris
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Old 2nd June 2011, 12:06 PM   #5
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Originally Posted by Chris Daly View Post
Hi Luke
No there is nothing that identifies polarity other than a number sequence 1,2,3,4. I suspect Radio Spares originally sold these with a connection information sheet. I will try 5v DC current limited to 5ma , and see which terminals hold a charge.

Thanks for your interest
Cheers / Chris
Not always a valid way of testing them as some electrolytics can hold a small reverse charge.

Try connecting a current limited supply and see which terminals slowly build up a voltage whilst reducing the current that is being drawn.
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Old 2nd June 2011, 01:11 PM   #6
Elvee is online now Elvee  Belgium
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Originally Posted by Chris Daly View Post
Have decided to dispose of them, as it is ridiculous this capacitor has no polarity markings.
I have contacted radio spares, in a last ditch attempt to identify.

cheers / Chris
Can you post some photo's. In my experience, there is always some form of identification somewhere, even when it's not apparent at all.
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Old 2nd June 2011, 02:09 PM   #7
Mooly is offline Mooly  United Kingdom
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Can you post some photo's. In my experience, there is always some form of identification somewhere, even when it's not apparent at all.
Yep... lets have a look see
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Old 2nd June 2011, 03:05 PM   #8
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Will get a photo in about 9 hrs, capacitor is in the workshop and everyone asleep at the moment.

Cheers / Chris
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Old 2nd June 2011, 03:09 PM   #9
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Are there any markings on the body of the capacitor ?

Sometimes they can be marked with a strip of a different colour.
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Old 2nd June 2011, 07:53 PM   #10
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Originally Posted by Chris Daly View Post
Have decided to dispose of them, as it is ridiculous this capacitor has no polarity markings.
I have contacted radio spares, in a last ditch attempt to identify.

cheers / Chris
If they are old then I would dispose of them anyway.
Cricklewood Electronics sell them new for 3-50 each.
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