Re: gEDA-user: sparkfun 4 layer boards

[Dave N6NZ <n6nz@xxxxxxxx>]

Mark Rages wrote:
> On Sat, Aug 23, 2008 at 12:04 PM, Eric Brombaugh <ebrombaugh1@xxxxxxx> wrote:
>> Mark Rages wrote:
>>> I've had moderate success clearing blind shorts with the 5V bus of a
>>> high-power computer power supply.  (This can be hazardous to other
>>> parts on an assembled board)

Yes, but the risk of unanticipated pyrotechnics always makes lab work 
more exciting :)

>>> Otherwise, use a current-limited power
>>> supply to put a few amps into the stuck node.  Use a millivolt meter
>>> to measure different places on it.  Lower voltage means closer to the
>>> short.
>> An IR camera to look for the hotspot would probably be a handy way to do
>> this too. Who's got an IR camera though?
>>
> 
> IR cameras are great for this.   I got a chance to see one in use last
> year at a contract manufacturer.  The misplaced part was dissipating a
> few milliwatts at most, but it showed bright red on the camera.

So, how much mileage could we get out of a cheap digital camera and 
replaced the IR blocking filter with a visible light reducing filter? 
There might be a cheap hackable camera that is suitable, since a lot of 
the low-end imagers are quite sensitive in IR.  Old camcorders might be 
another bet.

-dave

> 
> Regards,
> Mark
> markrages@gmail



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