So I have these transistors labeled C1815, they are NPN and apparently audio transistors. I grabbed the data sheet on them here: http://www.datasheetcatalog.com/...
So, I've never used "audio" transistors that I knew of until now, so maybe I'm just not aware of how they function as opposed to normal transistors, but it doesn't seem to be functioning as any transistor I'm familiar with (not many). After having problems with it, I hooked it up to a simple LED/resistor circuit to test it out. I turned out the circuit without anything connected to the base of the transistor and the LED turned on. So with absolutely nothing on the base I have current flowing through the transistor. When I attach a line to the base I get no visible change. I'd love to read out voltage/amperage but I don't have a multimeter (I live in Japan, and am currently on a long vacation in America, and have no descent parts shop near me so I grabbed what I could and am waiting on a digikey order with amongst other things a multimeter).
So, what did I do wrong? Please tell me how inexperienced and foolish I am for not understanding this and show me how I can be less uninformed about transistors in the future.