On Tue, 23 Nov 2004, Ed Edmondson wrote:

>>> Ed Edmondson wrote:
>
>>> The window is now covered by light blocking double faced tape. The led 
>>> is on solid. Putting my thumb on the tape causes it to appear to operate 
>>> (led flashes without sync signal).
>
>
>>>> Olin wrote:
>
>> Lots of things that appear "light blocking" to us in the visible range are 
>> surprisingly transparent at other wavelenths.  Black electrical tape is a 
>> good example.  It attenuates visible light heavily (else it wouldn't look
> black), but doesn't do much at all for IR.
>
> <<Snip>>
>
> What do you suggest I use to block the window with? I put two layers of 
> electrical tape over the window, turned off the desk lights and it appears to 
> be trying to work intermittently anyway.

Decorative aluminium tape from gift shop/decorators. Comes with nice 
pattern on it (similar to 'original' labels on bios eproms etc). Accepts 
indelible marker pen writing. Totally opaque (metallic aluminium backing).

Peter
_______________________________________________
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist