Re: gEDA-user: merge multi symbol components

["John P. Doty" <jpd@xxxxxxxxx>]

Joerg wrote:
>
> Totally OT here, quick question since you seem to be quite the expert on 
> this:  Do you know some sort of main distributor or clearing house for 
> space-rated parts? Or is the only way to just piece it all together like 
> usual, via individual quotes from companies such as Solitron?
>
>   

I don't know of any shortcuts. If you have a customer who insists on 
"space qualified" parts, you need to talk to them. Everybody has their 
own rules. If you're dealing with somebody with a lot of rules, you'll 
need a parts specialist to deal with them. This is more like lawyering 
than engineering.

 From an engineering perspective, "space qualified" is almost 
meaningless, since "space" is neither an environment nor an application, 
but a wide range of them. If the part that best fits your requirements 
is in stock at Digi-Key, use that. I've flown a lot of these with great 
success. "Space qualified" parts tend to fragile, obsolete junk that 
behaves unpredictably in actual applications. But they've been blessed 
by the priesthood.

Regardless:

Understand the mission.
Understand the environment.
Understand the physics of the interaction of the environment with the 
technology.
Understand the requirements.

In depth, not in the shallow, sloppy way that too many "designers" think 
adequate. There are no cribsheets, and "space qualified" is no guarantee 
of anything, except maybe on paper. God is in the details.

Don't torque your parts selection around to solve issues better 
addressed at the system level. Not every part needs to be immune to 
radiation-induced upset, for example.

-- 
John Doty      Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx 



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