[time-nuts] DC distribution

[William H. Fite]

A solid crimp is, I believe, generally held to be more than a solder joint
but this is in no way specific to audio cables.



On Saturday, October 5, 2019, jimlux <jimlux at earthlink.net> wrote:

> On 10/4/19 1:41 PM, Poul-Henning Kamp wrote:
>
>> --------
>> In message <5D979AC0.80304 at rogers.com>, MLewis writes:
>>
>> With audio signals, a soldered crimp is one of the worst possible
>>> connections.
>>>
>>
>> Dabbling in audio-homoepathy are we ?
>>
>> No, don't bother responding unless you have a reference to peer-reviewed
>> scientific documentation for you claim.
>>
>>
>
> well..
> https://nepp.nasa.gov/files/27631/NSTD87394A.pdf
>
> doesn't give why, and doesn't explicitly say "don't crimp and solder" but
> does basically say "crimp crimp connectors and solder solder connectors"
>
> TE "Crimp Theory Fundamentals; Advanced" - explanation of what makes a
> good crimp, doesn't discuss solder
> https://www.youtube.com/watch?v=bAO9eCS65jw
>
> There are actually splices designed to be crimped and soldered - but I
> suspect their applicability is for specific applications.
>
>
> On Monday, I will try to find one of the connector reliability people for
> some references.  One challenge is that these practices ("don't solder
> crimped connectors") have been around for a long time (at least 70 years),
> so there may not be recent published information on it. (recent papers I
> found on solder joint reliability are all about PWB connections - esp BGA,
> CGA, etc.)
>
> And, to be honest, materials have changed.
>
> There is *great* resistance to changing any assembly and workmanship
> standard - nobody wants to be the person who says "we don't need to do
> *that* anymore" and then a disaster happens, and one of the potential
> causes is "you didn't do *that*"
>
> It is entirely possible that the original rationale and explanation is no
> longer valid.
>
> There is no question that in a vibration environment, solder is deprecated
> (it's hard, brittle, work hardens, etc), not to mention all the issues with
> RoHS.  That said they do use solder joints in high reliability systems -
> just with attention to the support of the wire.
>
> https://www.tandfonline.com/doi/full/10.1080/14686996.2019.1640072
> https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20100029736.pdf
>
>
>
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