EL CAJON, Calif.—Alarm Relay, a full-service security company, is embarking on a multiphase mobile strategy with both near- and long-term goals. One of the opening phases of that plan is the launch of ...

Greg Kessinger is SD&I’s fire alarm and codes expert and a regular contributor. Email him your fire & life safety questions at [email protected]. Re-using the shell of a fire panel is a conundrum that ...

The burglar alarm circuit design was based on the operation of CMOS 4001 where a high output would only result if both the inputs to the gate are low. Burglar Alarm – one way of preventing break in’s ...