Alarms and Security related Schematics, Circuits and Diagram

Alarms and Security related Schematics
5 Zone alarm circuit	Micro-power over temperature alarm
A Basic RF Transmitter for PIR Sensors	Miniature loop alarm
Active IR motion detector	Modular Burglar Alarm
Alarm control keypad	Motorcycle alarm
Almost Ultrasonic Motion Sensor	Novel Buzzer
Combination Lock (PIC16F84)	Perimeter monitor
Digital combination lock	Personal silent alarm system
Door knob alarm	Proximity alarm
Electronic combination lock	Proximity detector for living creatures
Electronic door codelock (PIC16F84)	Refrigerator door alarm
Electronic lock	RF Alarm
Emergency Light & Alarm	Single Zone Alarm
Enhanced 4 Digit Alarm Keypad	Touch activated alarm system
Enhanced 5 Digit Alarm Keypad	Ultrasonic radar alarm
Frost alarm	Water Activated Alarm
Gate alarm circuit	Water level alarm
Home security project	Water seepage alarm (PDF)
Low power RFID transponder	Wire loop alarm