very simple question - Electronic Circuits Projects Diagrams Free

xjackal · 10th July 2003, 01:20 AM

i bought a polarized capacitor.its 100 micro farads.i cant assign its cathode and anode side.could u help?
can we also assign by avometer?
can we assign the sides by the white line thats on my capacitor?
weell dont :lol: at me! i just started practising.

Gene · 10th July 2003, 01:54 AM

Take it back to where you bought it. All electrolytics should be clearly marked. Sounds like yours is defective.

Klaus · 10th July 2003, 04:22 AM

If it has a white line it IS marked. The white line indicates the negative terminal. Sometimes there is a minus sign within the white line. If the capacitor has a light coloured case then it's usually a black line that indicates the negative terminal. On vertically mounting caps ( both leads on the same end) the side the line is on is the negative. On horizomtal mounting caps ( leads are at opposite ends) there should be an arrow within the line, pointing to the negative or the line is nearer the negative end of the case. With the latter, you can also see that the negative side is the metal casing.

Its a long time since I saw the positive terminal marked on small electrolytics.
Its different with tantalum capacitors, with these they mark the positive side with a '+' or a stripe. But 100micro would be quite a large tantalum so we can safely assume you got an electrolytic capacitor.

Make sure you do not exceed the peak voltage rating, which should be marked on the case.

Klaus

xjackal · 10th July 2003, 11:34 AM

thanks.i got the idea.

bogdanfirst · 10th July 2003, 01:05 PM

do the leads have the same lenght?
if they dont, then the longer one is the +

xjackal · 10th July 2003, 04:01 PM

[img] http://www.ic-prog.com/index1.htm
[/img]
which one is the anode and cathode side

Phasor · 10th July 2003, 09:55 PM

I don't think you posted that link properly, jackal, can you try again?

xjackal · 10th July 2003, 11:45 PM

but it was the jdm programmer scheme link

Phasor · 11th July 2003, 09:24 AM

The link is actually http://www.ic-prog.com/jdmprog.gif

A capacitor doesn't have an "anode" or "cathode" - only positive and negative terminals.

On the diagram, the side with a straight line and a "+" is the positive side, and the side with the curved line is the negative.

windozeuser · 24th November 2003, 11:44 PM

usually a capacitor is marked with a stripe Sometimes blue or white that indacates the negitive side

anode's cathode's I think ur confused with diodes???

pebe · 25th November 2003, 07:50 PM

Quote:

Originally Posted by Phasor

... A capacitor doesn't have an "anode" or "cathode" - only positive and negative terminals....

An aluminium electrolytic capacitor has. It has an anodic film formed on the '+' aluminium plate during manufacture, but the '-' plate is plain aluminium.

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10th July 2003, 01:20 AM	(permalink)
xjackal	very simple question i bought a polarized capacitor.its 100 micro farads.i cant assign its cathode and anode side.could u help? can we also assign by avometer? can we assign the sides by the white line thats on my capacitor? weell dont :lol: at me! i just started practising.

10th July 2003, 01:54 AM	(permalink)
Gene	Take it back to where you bought it. All electrolytics should be clearly marked. Sounds like yours is defective.

10th July 2003, 04:22 AM	(permalink)
Klaus	If it has a white line it IS marked. The white line indicates the negative terminal. Sometimes there is a minus sign within the white line. If the capacitor has a light coloured case then it's usually a black line that indicates the negative terminal. On vertically mounting caps ( both leads on the same end) the side the line is on is the negative. On horizomtal mounting caps ( leads are at opposite ends) there should be an arrow within the line, pointing to the negative or the line is nearer the negative end of the case. With the latter, you can also see that the negative side is the metal casing. Its a long time since I saw the positive terminal marked on small electrolytics. Its different with tantalum capacitors, with these they mark the positive side with a '+' or a stripe. But 100micro would be quite a large tantalum so we can safely assume you got an electrolytic capacitor. Make sure you do not exceed the peak voltage rating, which should be marked on the case. Klaus

10th July 2003, 11:34 AM	(permalink)
xjackal	thanks thanks.i got the idea.

10th July 2003, 01:05 PM	(permalink)
bogdanfirst	do the leads have the same lenght? if they dont, then the longer one is the +

10th July 2003, 04:01 PM	(permalink)
xjackal	what about the scheme [img] http://www.ic-prog.com/index1.htm [/img] which one is the anode and cathode side

10th July 2003, 09:55 PM	(permalink)
Phasor	I don't think you posted that link properly, jackal, can you try again?

10th July 2003, 11:45 PM	(permalink)
xjackal	ok i understood it. but it was the jdm programmer scheme link

11th July 2003, 09:24 AM	(permalink)
Phasor	The link is actually http://www.ic-prog.com/jdmprog.gif A capacitor doesn't have an "anode" or "cathode" - only positive and negative terminals. On the diagram, the side with a straight line and a "+" is the positive side, and the side with the curved line is the negative.

24th November 2003, 11:44 PM	(permalink)
windozeuser	usually a capacitor is marked with a stripe Sometimes blue or white that indacates the negitive side anode's cathode's I think ur confused with diodes???