You probably do!  CCDs are sensitive to infra red, and have a filter to=20
block it.  Remove the filter, and you have an infra red camera.

Kerry


Electron wrote:
> Hi Forrest,
>
> ..but, is this for some boards you designed, or some others' boards?
>
> I mean, if it's you that design the boards, then I'd place some test
> points which on released boards are jumpered, so you can cut the jumper,
> test it, and resolder it (just the jumper, no need to cut PCB traces).
> However, if the same board gets faulty components too often, and the
> failing component is ~always the same, then of course this should ring
> a bell. I used the jumper method several times, starting from prototypes,
> to isolate sensitive parts of the circuit, it saves a lot of time.
>
> As a more general method, nothing beats a thermal camera IMHO. I wish I
> had one!
>
> Cheers,
> MarI/O
>
>
>
> At 15.17 2011.11.10, you wrote:
>  =20
>> So I on occasion have a board that for whatever reason is effectively=20
>> 'shorted' to ground.  That is, something is drawing so much current that=
=20
>> the onboard switcher shuts down....
>>
>> Finding these tend to be a pain.   I've been looking at some of the=20
>> short locators out there, and although they would work for a bridge or=20
>> similar, they aren't likely to work in a scenario where for instance a=20
>> chip was soldered in backwards or is otherwise defective but needs some=
=20
>> power/current to show it (I.E. a power off-measurement shows open=20
>> circuit, or perhaps a diode junction).   AND - some of them seem to use=
=20
>> dangerously high voltages for detecting shorts on a 3.3V rail.  One I=20
>> found says it uses a 'safe, current limited 8 volts.  Yeah 8V, not so=20
>> safe to a 3.3V circuit).
>>
>> Often I can hook the offending board to a current limited power supply=20
>> and put a small amount of current into the board - and sometimes figure=
=20
>> it out by the 'hot component' method... but sometimes not.     Often I=20
>> end up resorting to cutting traces to isolate it down to a section of=20
>> the board - but that also tends to be destructive and is only really=20
>> useful in limited situations.
>>
>> In any case, I'd love to hear people's experiences with finding=20
>> shorts/defective components and suggestions about tools to isolate=20
>> (usually) a defective component.
>>
>> -forrest
>> --=20
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>> http://mailman.mit.edu/mailman/listinfo/piclist
>>    =20
>
>  =20

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