Random thoughts on the subject:
It is a couple of hundred feet to my rural mailbox. I have a yellow=20
plastic disk (cut from butter container) on a coil spring that tucks in=20
the door until it is opened. Not original, sold by Montomery Wards in=20
the 50s.

The pop up indicator on the turkey that means it is done.

The signal fuse that is intentionally blown to get the indication.
wax pellet between the jaws of spring loaded close pin. contacts in each=20
side of the jaws to close a circuit. DIY fire detector from the 1930s I=20
think.

Tell-tale labels for shipping delicate instruments.

On 9/10/2012 1:39 PM, alan smith wrote:
> So looking for a non powered visual indicator..ie...something that change=
s color, that would be tripped by the micro that a tech would be able to lo=
ok at and say...failed board due to....X
>
> So when the board is running this "thing" can be controlled and then its =
forever changed in state, even with the power off.
>
>
> Can't have smoke...so making a resistor crispy isnt allowed.
>
> Any thoughts?
>

--=20
John Ferrell W8CCW
=93During times of universal deceit,
   Telling the TRUTH becomes a revolutionary act=94
      George Orwell


--=20
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