Mark Rages wrote: > On Sat, Aug 23, 2008 at 12:04 PM, Eric Brombaugh <[EMAIL PROTECTED]> 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 > [EMAIL PROTECTED] _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
