I would like start doing some electrical tinkering/engineering as a hobby. In particular, I want to be able to build my own FM radio transmitter (some time in the far future, most likely, I realize it is an advanced goal from where I am now). I don't have the money or time to enter any kind of college course. What kind of textbooks can I grab that will give me at least an beginner-intermediate level of electrical engineering starting from the most basic of basics? Also, how much math should I know before starting to learn about EE? I know some basic calculus (derivatives, integrals), is this enough? So far I have downloaded some e-textbooks on the subject: 1) Electrical Engineering 101, Darren Ashby 2) The Art of Electronics, Horowitz & Hill 3) Hambley Electrical Engineering Principles, Allan Hambley Any feedback at all is appreciated.