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. ^^
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. ^^
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 🙂
Very old ones could have MFD but are µF.
.47 is likely to be 0.47µF.
Could you posts some pictures?
/Hugo 🙂
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
Then post the links to the pictures you have uploaded here.
If you want to sell some of them, let me know 🙂
thanks
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.
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.
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
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
I feel really stupid but...
wow, really? I didn't know there was such a thing!
I've just seen, ones that do Amp, Volt, and Ohms
David
wow, really? I didn't know there was such a thing!
I've just seen, ones that do Amp, Volt, and Ohms
David
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
😡 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
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
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
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'.
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