Friday, 14 September 2018

RGB LEDs with arduino/transistor won't dim


Why doesn't this work? I have fifteen RGB LEDs wired up with this configuration. The transistor I'm using is the MJE3055T. Are the transistor's voltage ratings (collector-base, collector-emitter) just too high for this low-voltage, high current application? When I eliminate the arduino and transistor and plug the LEDs directly into the power supply (with resistors of course) they work perfectly...


Does anyone know why this isn't working? Have suggestions for a different transistor?


Thanks!


led schematic




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