How do you find the size of the cap if no label?

[ECET0purdue]

just as the subject says.... ;D

 

[audioguru2]

I wouldn't re-use a cap without a label because you won't know its voltage rating.
If it is defective and needs replacement then testing it will probably give a false reading.

 

[ECET0purdue]

no there new... just i got some mixed up... some are blue with black line? i just was not sure if there was a decodeing system like there is for resistors?

 

[MP1]

There is a marking system for capacitors. I think someone posted a link to a site for this somewhere on the forum. You might find it with a search. If you can tell us the markings, one of the members here might be able to steer you in the right direction.

MP

 

[ECET0purdue]

i did a search before i made a topic... and it only found 3??? maybe my searches did not work... at least now i know there is a chart and i can always google it now..thanks
glen

 

[Alun]

What sort of capacitor is it?

Electrolytic?
Ceramic disc?
Tantalum?

Tantalums and electrolytics are polarised and will be even more of a problem if the polarity markink has worn off in which cas I'd dispose of it.

Do you have an oscillossope or frequency counter?

You could build an astable 555 timer oscillator with a known value resistor then measure the frequency of the output, and work out the capacitor value from the 555 frequency formula.

 

[ECET0purdue]

they are all electrlytics well at least 90% just they all were separate then it got knocked over so now i have like 50 different caps all together while some have the value on them and others dont. Maybe makeing a circuit with a 555 is too much work for them... thet sad there was a iec code but i could not find a chart or online calulator for them.
thanks,
glen

 

[MP1]

Here is a link that might help you.

http://www.uoguelph.ca/~antoon/gadgets/caps/caps.html

MP