Well I'm being a bit dramatic, I'm a licensed mechanic with 20 years in the trade, I feel like I'm falling behind in understanding the electronic workings of the things that I repair (the trade has moved from repairing problems to replacement of components) I want to have a better understanding and am looking for a book to amuse me, I read in a post a while ago about a book that helps in understanding the electronic workings, can anyone recommend some reading material?