Concise electronics for geeks (2010)
For those looking for a less-concise, but more comprehensive reference, The Art of Electronics was just released in its 3rd edition!<p><a href="http://artofelectronics.net/" rel="nofollow">http://artofelectronics.net/</a><p>With a lot of relevant new content (references to Arduinos, etc), which is great since the last edition was from 1989.<p>And while the basics of transistors, etc, haven't changed since then, it's arguable that the kinds of circuits that are of most relevance may have changed. (A/D conversion, general interfacing with digital logic, things that didn't have simple IC solutions in 89, etc).