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

Step 7Add the other resistor

add the other resistor

- glue R3 to the side of Q2 so it stays in place.

- connect one lead of R3 to pin 3 of Q2

- connect the other lead of R3 to pin 1 of Q1

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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.