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Alarms and Security related Schematics

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