A nice design which even turns off if the pushbutton is held depressed or jammed a long time. Not re-triggerable while the light is still on though(Thanks for pointing that out Watson):
Below is one that starts off bright and slowly dims out to nothing. They could have eliminated the need for a power switch by putting a 2.2M ohm resistor across the capacitor:
I do not gaurantee the accuracy or safety of any information herein.
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