Radio Spares 10,000uf polarity markings

Chris Daly · 2nd June 2011, 06:39 AM

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

Chris Daly · 2nd June 2011, 08:47 AM

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

Luke · 2nd June 2011, 09:30 AM

some times the rivet that holds the -ve tab on is black. Use a meter to find which are the two active pins.

Chris Daly · 2nd June 2011, 10:26 AM

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

Andy5112405 · 2nd June 2011, 12:06 PM

Quote:

Originally Posted by Chris Daly

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.

Elvee · 2nd June 2011, 01:11 PM

Quote:

Originally Posted by Chris Daly

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.

Mooly · 2nd June 2011, 02:09 PM

Quote:

Originally Posted by Elvee

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

Chris Daly · 2nd June 2011, 03:05 PM

Will get a photo in about 9 hrs, capacitor is in the workshop and everyone asleep at the moment.

Cheers / Chris

Andy5112405 · 2nd June 2011, 03:09 PM

Are there any markings on the body of the capacitor ?

Sometimes they can be marked with a strip of a different colour.

nigelwright7557 · 2nd June 2011, 07:53 PM

Quote:

Originally Posted by Chris Daly

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.

2nd June 2011, 06:39 AM	#1
Chris Daly diyAudio Member Join Date: Sep 2004 Location: hobart tasmania	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

2nd June 2011, 09:30 AM	#3
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	some times the rivet that holds the -ve tab on is black. Use a meter to find which are the two active pins. __________________ If you give a man a fish he will eat for a day. But if you teach a man to fish he will buy an ugly hat. And if you talk about fish to a starving man then you are a consultant. Dilbert

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2nd June 2011, 08:47 AM	#2
Chris Daly diyAudio Member Join Date: Sep 2004 Location: hobart tasmania	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

2nd June 2011, 10:26 AM	#4
Chris Daly diyAudio Member Join Date: Sep 2004 Location: hobart tasmania	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

2nd June 2011, 03:05 PM	#8
Chris Daly diyAudio Member Join Date: Sep 2004 Location: hobart tasmania	Will get a photo in about 9 hrs, capacitor is in the workshop and everyone asleep at the moment. Cheers / Chris

2nd June 2011, 03:09 PM	#9
Andy5112405 Banned Join Date: Nov 2006 Location: Torpoint	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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