The Alarm, Sensor & Security Circuit Cookbook - Thomas Petruzzellis - Google Books

http://books.google.de/books?id=RM2lEleKFAwC&pg=PA127

This text is aimed at technicians, hobbyists, and students and provides complete circuit diagrams and building instructions for a wide range of creative sleuthing applications. The designs are fully tested and proven effective in real-world alarm, sensor,…