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

Step 8Finish the circuit!

finish the circuit!

now connect the negative wire from the power source to pin 1 of Q1.

you're done! we'll make it less flimsy in the next step.

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2 comments

Sep 20, 2009. 10:43 AM

luvotter says:

I recommend you do this before BLOB-IT in step 8. Thanks for this cool compact circuit.

Jan 23, 2009. 3:28 AMsharmil says:

sir, is there any driver with pwm which can drive five 3w high power LEDs(connected in series) . the leds technical specification includes forward current -350mA, Voltage- 2.9-3.7v, typical intensity-65lm.

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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.