P.O. got so excited by all the responses from the TicTac flashlight project that he sent us another of his creations.
This time it’s a LED lamp created from the scraps of an old 9v battery and three LED’s. No need to use a resistor here as he’s used three 3.5v LED’s which adds up to a required voltage of 10.5v… which the battery can’t supply.
The benefit of this is that you don’t have any losses in a resistor and the battery will end up lasting longer – but the LED’s will not operate on 100%.
Take it or leave it, this is a great project that involves few components and has a compact and robust design.
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