[Diy_efi] PCB layout/circuit design

Bevan Weiss kaizen__
Mon Feb 26 19:01:17 UTC 2007



> Bevan Weiss wrote:
>
>> I haven't looked into temperature ratings for super caps lately, but 
>> last I looked they weren't great.  Something like -5degC to 45degC..
>
> Eep. is that failure at -5 degrees, or simply that they lose their 
> charge? (the latter isnt much of a problem in our case unless they 
> REALLY lose it)
That's rated temperature.. so outside of that anything can happen.  
Generally you'll get a deviation from the rated capacitance.  In most 
cases it will fall significantly.  With lower temperature generally the 
ESR will also increase (much like a battery), and the leakage current 
will also decrease.
It's not a big issue so much, apart from the slightly increased 
possibility of container rupture (which would be a bad thing).  Super 
caps tend to work best in situations where they aren't hot or cold.. 
otherwise batteries tend to do a better job.
>
>> I applaud you for taking on this design in such a public manner.  
>> Sorry if it seems like we're telling you how to suck eggs, just want 
>> to make things easier for you :)
>
> I'm no expert on analogue electronics either, so Im here for all the 
> learning I can get too :-)
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> Subscribe: http://lists.diy-efi.org/mailman/listinfo/diy_efi
> Main WWW page:  http://www.diy-efi.org/diy_efi
>
>





More information about the Diy_efi mailing list