1.
1. Home page to The Scots Guide to Electronics
非常详细的介绍了一些电路原理。
其中Analog & Audio:http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/audio/Analog.html
Radio Techniques and Coherence:http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/RadCom/intro.html
非常好

http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/intro/electron.htm - 外文