Re: gEDA-user: sparkfun 4 layer boards

[Dave McGuire <mcguire@xxxxxxxxxxxxx>]

On Aug 23, 2008, at 1:52 PM, Dave N6NZ wrote:
>>>> 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.

   I'd be shocked and amazed if they could detect thermal IR.

            -Dave

-- 
Dave McGuire
Port Charlotte, FL




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