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Old 11th September 2004, 08:59 PM   #1
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Default unknown capacitors

I recently acquired a boat load of capacitors from this researcher who was cleaning out his lab.
He organized them by capacitance in a box, but I'm still uneasy. What is the standard capacitance rating on caps?

The reason I ask is there are really old caps in there and brand spanking new caps in there, some even have no ratings on them, just a serial number.

My question is, if it has the following.. .47 100V +-10%
.47 what? uF or milliFarads?

Sometimes there will be 330 MFD is the capital M, used for micro or millifarads?

I'm building a Car DC-DC converter for a carputer and the caps are the last thing I'm putting on... I really don't relish the explosion from misplaced caps on by awesome circuitboard.

Eternalightwithin

P.S. I got lots and lots of orange and green caps. ^^
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Old 11th September 2004, 09:11 PM   #2
Netlist is offline Netlist  Belgium
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It really depends.
Very old ones could have MFD but are F.
.47 is likely to be 0.47F.
Could you posts some pictures?

/Hugo
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Old 11th September 2004, 10:10 PM   #3
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Default here they are... the majority of them anyways

Cap pic 1
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Old 11th September 2004, 10:13 PM   #4
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Default cap 2

2nd batch
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Old 11th September 2004, 10:14 PM   #5
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Default 3rd ones

3rd ones
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Old 11th September 2004, 10:16 PM   #6
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Default 4th and last

sigh... is there a way to cram them all in one post? I don't know how.
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Old 12th September 2004, 05:32 AM   #7
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If you want to post larger pictures you can use: http://www.imageshack.us/index.php


Then post the links to the pictures you have uploaded here.


If you want to sell some of them, let me know



thanks
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Old 12th September 2004, 06:55 AM   #8
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if it says .47, that means it has .47uF or 470nF.

330MF means 330uF for the electrolytic.

the other cap says .0068 which is 6.8nF or 0.0068uF.

another says 1.0K, 1.0 is the value which is 1uF, K is for tolerance.
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Old 12th September 2004, 09:11 AM   #9
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Hey,

That bright-orange colored one is a Sprague OrangeDrop, as used in Dynaco ST-70.

The silver colored cylinderal one labeled 'TAS+' is a military quality Mallory Tantalum capacitor.

The tantalum cap is really rugged, so it's the best one for DC-DC converter.

Cheers
JayJay
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Old 15th September 2004, 10:27 PM   #10
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Me thinks it might be time to invest in a multi meter that measures capacitance.
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