[time-nuts] OT Prototype Boards

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Tue Jun 25 11:05:31 EDT 2013


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 they're defined as the same, then I'm the one out of date.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<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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>
>
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