books on schematic?

[veganinme]

are there any for understanding them? or any on how to build pedals?

[KORGULL]

Here's where you can buy a book on building pedals and also one about modifying them: http://www.smallbearelec.com/Categories.bok?category=Books+And+Publications

You can find out what some symbols mean in schematics in the DIY FAQ: http://www.diystompboxes.com/cnews/FAQ.html

...and google has some links to articles and books you can buy : http://www.google.com/search?client=safari&rls=en&q=reading+schematics&ie=UTF-8&oe=UTF-8