I'm trying to drive a bunch of LEDs with all their cathodes tied to a PNP transistor to turn them all on and off. I'm using PN2907as (http://www.jameco.com/Jameco/Products/ProdDS/178520.pdf
) because I had them around.
The problem is the transistor isn't letting enough current through. When I connect the LEDs directly to ground they use 360mA, but when I use the transistor they only use 270mA (the LED cathodes to the emitter, ground to the collector, and base to either Arduino pin or directly to ground to test).
The datasheet says the transistor should be able to handle 800mA, but...obviously I'm missing something. Is there a better PNP transistor for this?