Re: gEDA-user: sparkfun 4 layer boards

[Steven Michalske <smichalske@xxxxxxxxx>]

get an IR pass filter, they often look like a mirror,  and use a nikon  
D70,  you typically don't need to take the cut filter off.

do a quick search on digital IR photography.

Happy Hacking

On Aug 23, 2008, at 10:52 AM, Dave N6NZ wrote:

> 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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