I was looking for something like that a while ago and I did not find too much stuff. Hope someone's got info about some great books. The only ones I found useful with more technical understanding of what's going down in the circuits are Brian Wampler's ones. You can find them here: http://freestompboxes.org/viewtopic.php?f=70&t=16716#p201195
Which is about one of the most thorough resources I've found. Wampler's books are great for the practical guitar application, but he assumes you already know a lot of theory.