the circuit just asks for power transistors. tip122 would work just as fine. i am setting the voltage to 0, using an analog write function, i.e.analogWrite(led, 0);
so i followed this LED strip tutorial: http://www.ladyada.net/products/digitalrgbledstrip/index.htmlbasically I've followed the circuit with the TIP 122 transistor, and I'm trying to fade between 3 led strips. they all work, except one of the strips will not completely turn off. I'm not sure if anyone has some quick suggestions/tips why this might be happening. the code has been tested and works fine with lower voltage LED's. I've adjusted the circuit to take into an account an external power supply instead of the Arduino power due to low amperage and not enough voltage. help?