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Power LED's - simplest light with constant-current circuit

Step 5Keep building

keep building
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now we'll start connecting Q1.

first, glue Q1 upside-down to the front of Q2 so that it is easier to work with. this has the added benefit that if Q2 gets very hot, it will cause Q1 to reduce the current limit - a safety feature!

- connect pin 3 of Q1 to pin 1 of Q2.

- connect pin 2 of Q1 to pin 3 of Q2.

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Author:dan(MonkeyLectric)
Dan Goldwater is a co-founder of Instructables. Currently he operates MonkeyLectric where he develops revolutionary bike lighting products. He also writes a DIY column for Momentum magazine.