led torch

I had a circuit diagram of a led torch that uses a 555 to pulse the led so
that it can produce more light without burning. I lost it and I am looking
for it. Does this really work as effective as they say? I want to build it
using 4 4.4cd green leds

 

No, it doesn't, according to Don K's LED pages.
See the sixth paragraph here. http://members.misty.com/don/ledx.html

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###Got a Question about ELECTRONICS? Check HERE First:###
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