In the eastern block the customary pitch was exactly 2.5mm. At least
SSSR and DDR ICs were made so. For DIP40s it was a little of a stretch
(read pin bending) job to get them fit on .1" spaced boards...
On 6/25/2013 5:09 PM, J. Forster wrote:
It's not 'industry'. It's the international standards agency, whatever
it's called. The folks that define a meter as some number of wavelengths
of light in vacuo and so on.
There are some early perf boards that have holes on 1/16" centers, for use
w/flea clips'.
-John
===============
OK, I see in the wiki that 0.1" is by definition 2.54mm. I was taught it
was 2.54001, but that's not right, either. But, if industry says that
they're defined as the same, then I'm the one out of date. =) I wonder
what was with that old prototype board. I can't find it, so it must be in
a landfill, but it was just exactly the wrong size to fit a chip. You
could get the first few pins in, but then the differences would be enough
that no more would fit.
Bob
----- Original Message -----
From: Orin Eman<[email protected]>
To: Discussion of precise time and frequency measurement
<[email protected]>
Cc:
Sent: Monday, June 24, 2013 11:35 PM
Subject: Re: [time-nuts] OT Prototype Boards
0.1" is 2.54mm by definition these days.
See: http://en.wikipedia.org/wiki/International_yard_and_pound
Now whether the board really is 2.54mm is an entirely different
matter...
if it is, you should be fine with 0.1" pitch chips.
Orin.
On Mon, Jun 24, 2013 at 9:10 PM, Bob Stewart<[email protected]> wrote:
I need to get some largish prototype boards for my project. Has the
industry standardized on a 0.10" pitch for hole spacing? IOW, if the
ad
says 2.54mm pitch will I get a board that will fit American chips, or
will
I just get something metric sized for the landfill? I ask, because
I've
got a prototype board sitting around here someplace that is unusable
because the pitch isn't quite right. Needless to say, I'm ordering
this
from ebay from a seller in China or Hong Kong or someplace, points
East.
Bob - AE6RV
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
