Russell McMahon wrote:
> We'll take that at face value.
>
> Ah. LED flasher. Just one flash. Very bright :-).
>   
It could be an LED with internal resistor, but most are not. If you ONLY 
want a flashing LED, you can buy ones with the flashing built in.

It's possible to have a circuit with a standard LED with no apparent 
series resistor (A constant current source pin), but this doesn't look  
like it.
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