The advent of eBay and the sale of cheap pre-built electronic modules has dramatically changed the hobby of electronics. Now you can build power supplies, amplifiers, timers, flashers (and a whole lot more) vastly more cheaply and easily than ever before. This book covers over 20 electronic modules - all are available on eBay. Sometimes the coverage is of just the bare module (what it does and how to connect it up) while in other cases, complete projects are built using the modules. All modules have been purchased and thoroughly tested.This is an ideal book for someone developing an interest in electronics as a hobby, right through to the more advanced user who wants to quickly and cheaply build projects that work well. The author writes for Everyday Practical Electronics magazine and this book is based on his very successful 'Electronic Building Blocks' column.