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 Cap I.D. Voltage?

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Tony Wells

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PostSubject: Cap I.D. Voltage?   Tue Oct 12, 2010 1:47 pm

I have a handful of new caps. Some SM, some poly, some Mylar. How does a person know what voltage they are rated for if that isn't included in the markings?
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glasdave

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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 1:53 pm

If they have a name, try a search at mouser, allied, or digi-key. Or post some pictures, lots of old timers may know them by sight, David.
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Tony Wells

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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 1:56 pm

I did a little searching. The ones that I am having th e most trouble with are made by ADI. Not much data on them, so far. 'Tis a shame too, I have about 50 pcs 6800 pf 2% that look like they should be 600 or better, judging by the size. The only thing I don't like about them (other than no V marking) is they have PCB leads. I can deal with that, though.
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tubes4life



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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 3:32 pm

Isn't there a letter or a number code on them? Some caps have codes to designate voltage rating.
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Tony Wells

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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 3:38 pm

tubes4life wrote:
Isn't there a letter or a number code on them? Some caps have codes to designate voltage rating.

That, I know. The value is printed in code, but nothing for voltage. Only mfg marking.
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vacuum tubes tesla coil



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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 4:08 pm

take one, subject it to massive amounts of voltage, and when it breaks, that the voltage? Smile
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Tony Wells

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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 4:17 pm

vacuum tubes tesla coil wrote:
take one, subject it to massive amounts of voltage, and when it breaks, that the voltage? Smile

To be comfortable in the least, I would have to waste about half of them at less than the consistent failure voltage. Consistent failure voltage testing would eat up the other half. Then I would be out of capacitors, and only partially comfortable with the specification I established. 100% loss.....no thanks.
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smeezekitty

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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 4:24 pm

Tony Wells wrote:
vacuum tubes tesla coil wrote:
take one, subject it to massive amounts of voltage, and when it breaks, that the voltage? Smile

To be comfortable in the least, I would have to waste about half of them at less than the consistent failure voltage. Consistent failure voltage testing would eat up the other half. Then I would be out of capacitors, and only partially comfortable with the specification I established. 100% loss.....no thanks.
Take two or three and apple 300v.
If none break down, assume they are fine for that voltage.
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oldradiospook

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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 4:38 pm

Tony Wells wrote:
I have a handful of new caps. Some SM, some poly, some Mylar. How does a person know what voltage they are rated for if that isn't included in the markings?
Try here: http://highfields-arc.6te.net/constructors/info/capacit.htm

and here:
http://highfields-arc.6te.net/constructors/info/capacit.htm

about middle of page for SMD:
http://my.execpc.com/~endlr/markings.html

No helpy? so solly. elephant
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vacuum tubes tesla coil



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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 4:44 pm

smeezekitty wrote:
Tony Wells wrote:
vacuum tubes tesla coil wrote:
take one, subject it to massive amounts of voltage, and when it breaks, that the voltage? Smile

To be comfortable in the least, I would have to waste about half of them at less than the consistent failure voltage. Consistent failure voltage testing would eat up the other half. Then I would be out of capacitors, and only partially comfortable with the specification I established. 100% loss.....no thanks.
Take two or three and apple 300v.
If none break down, assume they are fine for that voltage.

How do you apple 300 volts? do you grow apples that are in electrified soil, and burry the caps in the fruit when they're ripe?


Very Happy
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OldWireBender



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PostSubject: Re: Cap I.D. Voltage?   Tue Oct 12, 2010 11:27 pm

vacuum tubes tesla coil wrote:
smeezekitty wrote:
Tony Wells wrote:
vacuum tubes tesla coil wrote:
take one, subject it to massive amounts of voltage, and when it breaks, that the voltage? Smile

To be comfortable in the least, I would have to waste about half of them at less than the consistent failure voltage. Consistent failure voltage testing would eat up the other half. Then I would be out of capacitors, and only partially comfortable with the specification I established. 100% loss.....no thanks.
Take two or three and apple 300v.
If none break down, assume they are fine for that voltage.

How do you apple 300 volts? do you grow apples that are in electrified soil, and burry the caps in the fruit when they're ripe?


Very Happy

Yabut, those caps are only good in the AF section of a radio, you know, the applefiers. Laughing

John
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