Well, I was surfing eBay a few days ago.. and came across an exciting deal..100 S9013 NPN transistors for $4 with free shipping..
Of course, before looking into the specifications too much, just scammed over and seen that it can handle up to 30v at 500ma..
But I seen that the "Absolute Maximum Emitter Current" is -500 ma.
http://www.datasheetcatalog.org/datasheet/auk/S9013.pdf
Now I'm just all kinds of confused! Do I need a negative voltage to run this, or does it output a negative voltage? If I don't find a use for them, regardless, I can use them for like... arrow heads or something, right? American-indian style all up in this! :P
I'm just a bit worried now that I look at that, I don't want to hook up my Arduino and try pull some kind of power it can't supply. I've only worked with a few (9014 and 9015) because they came with my Radioshack Electronics Learning Lab (badass lab).
Anywho, thanks for at least getting this far in the post! :D. Still waiting for the transistors (guess they only shipped like 6 days ago from China, but waiting makes things.. well, seem long!)