[Diy_efi] Project/temperature ranges

[Dave Harvey]

I agree with Adam.  The cost of military-grade parts is small compared 
to the time and expense troubleshooting a thermal or design margin 
problem.   Unless you are GM, making electronics by the millions, a few 
extra bucks for parts is no big deal.  I work at the other end of the 
scale; designing electronics for space applications where we build a few 
(or one).  In that case, reliability and design margin are everything.  
I always use the best parts I can get because I've had some bad 
experiences when I didn't.  As a wise engineer once told me when I 
remarked on the extra size, weight and cost of additional design margin: 
"The only thing margin saves is your ass."

-- Dave

Adam Wade wrote:
> --- "Steven P. Donegan" <steve at donegan.org> wrote:
>
>   
>> For the moment I am working more on function and
>> less on boundary conditions - ie I am working with
>> commercial temp range parts and 'reasonable' power
>> supply fluctuations. Once the system works in those
>> conditions I will indeed go to automotive/military
>> temperature range components and expect zero
>> goodness from vehicle power :-)
>>     
>
> I am probably late making the comment, but you
> probably stand a significant chance of having a bug
> crop up during development that will eventually be
> traced back to NOT having done something like spec'ing
> for wider limits in temp, noise tolerance and/or power
> supply issues.  If this happens, the time spent
> debugging in the testing the design phase will likely
> exceed the time (and effort) required to just spec out
> parts to handle much larger environmental limits than
> the basic "standard" you're using to get the thing off
> the ground.
>
> Of course, you might NOT run into a problem, and in
> that case, you'd end up spending only a little more
> time and effort to up-rate the design after basic
> development.  But to me, it doesn't seem like the
> initial effort would do anything but potentially speed
> up development, and could potentially save you some
> serious headaches...
>
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>
>  
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