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'[OT]: Source for SMT Caps small qtys'
2002\09\30@133216 by Bill Westfield

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Um. I've found ebay to be an unexpectedly reasonable source for some
electronics components.  There's a guy selling 50 SMT transistors with
a couple hundred assorted SMT resistors and caps for about $10 incuding
postage (nfceramics?)

BillW

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2002\09\30@183914 by Peter L. Peres

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On Mon, 30 Sep 2002, William Chops Westfield wrote:

*>Um. I've found ebay to be an unexpectedly reasonable source for some
*>electronics components.  There's a guy selling 50 SMT transistors with
*>a couple hundred assorted SMT resistors and caps for about $10 incuding
*>postage (nfceramics?)

Speaking of ceramics, can ayone please point to a website that describes
the usual assignments of color marks on disc ceramic caps (NPO etc etc).
My books have no data on this. I seem to remember that black on top is NPO
but I also have white yellow and green and red. I know that there is no
one standard for this marking, but any pointers are welcome.

Peter

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'[OT]: Source for SMT Caps small qtys'
2002\10\01@102507 by cdb
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The colour code is the same as for resistors - well the ancient ones
I have here are anyway.

Colin
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cdb, spam_OUTbodgy1TakeThisOuTspamoptusnet.com.au on 02/10/2002

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2002\10\02@133855 by Peter L. Peres

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On Wed, 2 Oct 2002, cdb wrote:

*>The colour code is the same as for resistors - well the ancient ones
*>I have here are anyway.

Not that code. The code that gives temperature dependency of capacitance.
There is a splotch of color on top of an otherwise normally marked cap to
tell that. Like its top edge was dipped in color.

Peter.

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2002\10\02@195759 by cdb

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Peter,

According to my ancient book of colour codes the following is the
mica EIA/MIL codes for caps temperature range.

Black   -55 to + 70 (mil  spec)
Red     -55 to + 85
Yellow -55 to + 125
Blue    -55 to + 150(mil spec)

All temps in degrees centigrade.

Just as an aside Vibration codes are:-

Black  10-55 Hz
Yellow 10-2KHz

colin
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2002\10\04@022719 by Peter L. Peres

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On Thu, 3 Oct 2002, cdb wrote:

*>Peter,
*>
*>According to my ancient book of colour codes the following is the
*>mica EIA/MIL codes for caps temperature range.
*>
*>Black   -55 to + 70 (mil  spec)
*>Red     -55 to + 85
*>Yellow -55 to + 125
*>Blue    -55 to + 150(mil spec)
*>
*>All temps in degrees centigrade.
*>
*>Just as an aside Vibration codes are:-
*>
*>Black  10-55 Hz
*>Yellow 10-2KHz

Thanks, very useful, but still not what I asked for. I am interested in
temperature coefficient color code. Like black = NPO, green = +500ppm/K
(??)  etc.

Peter

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2002\10\04@044654 by cdb

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Well I haven't had the right answer yet, my book doesn't specifically
statet the coefficients but it does list A-F characteristics and
under 9 dot codes says

Black A (EIA) six dot system used for 'N' temp range caps
manufactured to EIA RS-153-A.

Well what do yer know turn the page and all becomes clear.
This time I must be right :) hopefully!

Black      0   PPM  degrees C
Brown   -33
Red      -75
Orng    -150
Yellow -220
Green  -330
Blue   -470
Violet  -750
Gray   +150 to -1500
Silver  +100 to -750

It also has another column TEMP Significant Figure

Black 0.0
Red   1.0
Ornge 1.5
Yell    2.2
Green 3.3
Blue   4.7
Violet 7.5

Please tell me I've finally hit gold!

Here's hoping

Colin
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2002\10\05@021811 by Peter L. Peres

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On Fri, 4 Oct 2002, cdb wrote:

*>Well I haven't had the right answer yet, my book doesn't specifically
*>statet the coefficients but it does list A-F characteristics and
*>under 9 dot codes says

Yep, this is the one, thanks. 6 dots is no longer commonly used apparently
but disc caps get dipped on the edge with the same colors for tempco
indication.  Thank you very much. This data is missing from my books (too
new ? too cheap ? lost in translation ?).

Peter

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