home :: categories :: alarms-and-security :: miscellaneous-security

Miscellaneous security circuit diagrams

Emergency Light and Alarm
October 3, 2010

This circuit is permanently plugged into a mains socket and NI-CD batteries are trickle-charged. When a power outage occurs, the lamp automatically illuminates. Instead of illuminating a lamp, an alarm sounder can be chosen. When... [more]

circuit from:http://www.extremecircuits.net/2009/07/emergency-light-and-alarm.html

PIC Security System Dials Your Cell Phone
August 3, 2010

The circuit consists of a small PIC microcontroller, assembly program, and a few other parts to detect a switch closure from an open door, window, or manual push button and then dial the cell phone... [more]