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, and security equipment.Thomas Petruzzellis. The DTMF location alarm is ... The tone modules are built on a 2 x 3-inch circuit board. ... The normally closed switches or sensors are all wired in series between point C and D on the circuit diagram. The normally open switches are connected from point B to the power bus or supply. The point labeled Eanbsp;...
|Title||:||The Alarm, Sensor & Security Circuit Cookbook|
|Publisher||:||McGraw Hill Professional - 1994|