unknown capacitors

EternaLightWith · 2004-09-11 8:59 pm

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. ^^ :devilr:

Netlist · 2004-09-11 9:11 pm

It really depends.
Very old ones could have MFD but are µF.
.47 is likely to be 0.47µF.
Could you posts some pictures?

/Hugo

EternaLightWith · 2004-09-11 10:10 pm

here they are... the majority of them anyways

Cap pic 1

EternaLightWith · 2004-09-11 10:13 pm

cap 2

2nd batch

EternaLightWith · 2004-09-11 10:14 pm

3rd ones

3rd ones

EternaLightWith · 2004-09-11 10:16 pm

4th and last

sigh... is there a way to cram them all in one post? I don't know how.

thomas997 · 2004-09-12 5:32 am

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

djQUAN · 2004-09-12 6:55 am

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.

jamesjung21 · 2004-09-12 9:11 am

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

Jonathan Bright · 2004-09-15 10:27 pm

Me thinks it might be time to invest in a multi meter that measures capacitance.

EternaLightWith · 2004-09-19 9:00 pm

I feel really stupid but...

wow, really? I didn't know there was such a thing! :cannotbe:

I've just seen, ones that do Amp, Volt, and Ohms

David

EternaLightWith · 2004-09-19 9:46 pm

Gaah

Too late, I can't edit.
Oh well, ebay has a great auction on the Fluke 87 III series.
I think I prefer this over the Portec ones, I heard bad things aobut those. I think 150 for it is reasonable.

David

Fluke handheld DMM

thomas997 · 2004-09-20 12:22 am

Are you sure that measures capacitance?

It doesnt look like it to me.

Here are a few:

http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&category=25421&item=3840964912&rd=1&ssPageName=WDVW

http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&category=4678&item=3840860585&rd=1

Jonathan Bright · 2004-09-20 1:54 am

The other trick with plastic film capacitors that you are unsure of is to heat them. In another, earlier, thread someone suggested an ingenious idea. Wire up your meter to the cap' and then heat it (the cap) with a hairdryer. Most of the dialectics have a variation in capacitance with temp' and if you consult a site on capacitors and look for the temprature characteristics you will find the ones that increase or decrease (or remain static) with change in temp'.

unknown capacitors

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