First, let me just say that I am very new to electrical engineering. It is something that I started teaching myself mere months ago. So, basically, it is probably best that you guys assume I know nothing. As I have expanded my knowledge, I have built some little things. For instance, an LED light, an electro-static (Van de Graaff) generator, a "brushless" DC motor, et cetera... Most recently, I have been trying to make a little tone-generating circuit. I originally thought I could just connect an LC circuit to a speaker, and run a current through it. Upon researching why that did not work, I came across Hartley and Colpitts circuits, both of which used a transistor to keep the oscillations going. So, I got a transistor. Still, no tone. I have tried numerous simple circuits that I have seen online. Any tones should have been within the audible range. Yet, I have heard none. Thinking I might need to amplify the signal, I have tried connecting some of my circuits to the Line In on my computer, rather than directly to a speaker. Typically when connecting to Line In, I would get my power directly from one of my computer's 5V connectors. Such seemed easier than using a battery. Basically, I was wondering if you guys could show me a circuit that should work. Maybe then I can figure out what I am doing wrong... I currently have two capacitors of 10 µF each and one that is 470 µF. My three inductors are each 100 µH. I also have an MPS2222A transistor and a plethora of 1/4 W resistors. I appreciate any help you guys can give me! Thanks!