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  • Intermittent alarm generator
  • Burglar alarm
  • Moisture alarm
  • Automatic Entry Control System
  • Fridge door alarm
  • Electronic door code lock (PIC16F84)
  • Ultrasonic remote control & alarm system
  • Wire loop alarm
  • Proximity alarm
  • Electronic lock
  • Digital entry lock
  • Proximity switch
  • Toxic Gas Detector
  • Door knob alarm (pdf)
  • Water seepage alarm (pdf)
  • Micro-power over temperature alarm (pdf)
  • Personal silent alarm system
  • Active IR motion detector
  • A Basic RF Transmitter for PIR Sensors
  • PIR motion detector
  • Simple alarm system
  • Home security project
  • 5 Zone alarm circuit
  • Miniature loop alarm
  • Novel Buzzer
  • Gate alarm circuit
  • Modular Burglar Alarm
  • Motorcycle alarm
  • Enhanced 5 Digit Alarm Keypad
  • Enhanced 4 Digit Alarm Keypad
  • RF Alarm
  • Single Zone Alarm
  • Water Activated Alarm
  • Water level alarm
  • Perimeter monitor
  • Digital combination lock
  • Alarm control keypad
  • Almost Ultrasonic Motion Sensor
  • Alarm loop sensor (LM3915)
  • Touch triggered alarm
  • Universal alarm system
  • Warning strobe flasher for alarm systems
  • Collection of alarm circuits
  • PIR motion detector light controller
  • Micropower wireless motion detector transmitter
  • Touch activated alarm system
  • Combination Lock (Simple Version)
  • Combination Lock (PIC16F84)
  • Low power RFID transponder

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