Circuit board trace repair...
Carlos E Murillo-Sanchez
ce.murillosanchez at gmail.com
Fri Aug 14 01:16:13 CDT 2020
Chuck Guzis via cctalk wrote:
> On 8/13/20 9:58 PM, dwight via cctalk wrote:
>> How much current is ir suppose to carry? I'd just replace it with a piece of wire wrap wire if it is less than an amp.
>> Of course, I assume you've fixed what ever failed to cause it to blow.
>> Gold wire is expensive.
> According to my tables, AWG 30 copper wire has a resistance of 0.107 ohm
> per foot or about 9 milliohm per inch. I suspect that it would work
> under almost all PCB repair conditions. I've repaired power traces on
> CPU boards using WW wire with no ill effects.
Of course, it is not just about the resistance, but the resulting
thermal cycling at the endpoints... About 25 years ago, I learned the
hard way about keeping each amp across at least two DB-whatever pins in
experimental hybrid-electric vehicles. Nowadays we routinely x-ray
crimps for safety-critical things such as ABS harnesses. Ampacity
calculations differ wildly accross applications.
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