Hi, I'd like to build a little circuit board with about 5 or 6 leds on it. Each led would be driven from it's own pin on the arduino. I'd like to supply the power to light the leds from an external power supply so I'm guessing I'll need to use transistors to switch the power. Seeing as I have 5 o…

Transistors and LEDs

mjkzz March 27, 2013, 9:26am 5

Someone must have said it before me, but ULN2003 can do up to 500mA

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