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Thread: Current on a PCB
www.piclist.com/techref/pcbs.htm?key=pcb
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face BY : Mark Willis email (remove spam text)



Dan Michaels wrote:
> Mark Willis wrote:
> .....
>  (Some people think you can
> >get away with 10 mil ground & Vcc traces that snake all over the board,
> >and things will work fine.
> ......
>
> Hard to imagine anyone would do this. Even though the nomograph
> indicates you can run 750 mA thru such a trace, and only have a 10degC
> temp rise, there are several "other" things to worry about. Trace series
> R producing IR drops. Digital noise in this narrow channel. Inductive
> effects of narrow trace width at hi speeds. Impedance issues. On and on.

Sure - All those things that total newbies haven't learned about yet -
Ability to use a CAD package does NOT imply exquisite knowledge of all
things electronic <G>

We've all had our "weird" experiences - I've had an argument with an
Honors EE 4th year student who argued that 10-turn panel pots didn't
exist, while sitting there *using* a Textronics 'scope that had several
on it's front panel (with locks);  I've accepted that people don't learn
everything and tried to focus on educating the spots they missed.  Many
colleges teach loads of "Book" knowledge - new EE graduates don't always
know about the real world things that Techs have learned (soldering, for
one <G>)  Happens.  Some of us are good on digital, some on analog, some
stronger or weaker on code or hardware, a little redundancy isn't always
a bad thing on the list <G>

 Mark

--
I re-ship for small US & overseas businesses, world-wide.
(For private individuals at cost; ask.)

<393574D9.E6DE1DE5@foxinternet.net> 7bit

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