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How do I make an LED gradually brighten then suddenly turn off Is there simple way to do this without programming a chip Answered

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maddogfenby (author)2010-04-29

If you just wanted to do it once all you have to do is plug it in to a series of batteries (or any one battery) that hold(s) a charge greater than what the LED can support.

However, I'm sure you could do this with a switch and a few transisters and resistors - do a search on Instructables and you ought to be able to find something.

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astrodave90 (author)2010-04-29

once per switch throw would be good. going from dim to its full extreme brightness like a laser charging up(scifi space ship) I would thing the charge up time would run about 1.5sec no longer.

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Jack A Lopez (author)2010-04-29

Just once? Or periodically?  How long, in seconds, is the gradual turn-on period?

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steveastrouk (author)2010-04-29

How gradually ? An R-C circuit, with a pair of transistors wired like a thyristor would do it.

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