[time-nuts] OT Prototype Boards

J. Forster jfor at quikus.com
Tue Jun 25 14:09:07 UTC 2013


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 they're defined as the same, then I'm the one out of date.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 <orin.eman at gmail.com>
>> To: Discussion of precise time and frequency measurement
>> <time-nuts at febo.com>
>> 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 <bob at evoria.net> 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
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