Alarms and security related schematics
  • Proximity alarm
  • Electronic lock
  • Electronic door codelock (PIC16F84)
  • Moisture alarm
  • Fridge door alarm
  • Ultrasonic remote control & alarm system
  • Wire loop alarm
  • 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
  • Frost alarm
  • Ultrasonic radar alarm
  • Refrigerator door alarm
  • Emergency Light & Alarm
  • Electronic combination lock
  • Proximity detector for humans / living creatures using eddy current detection
  • 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
  • Touch activated alarm system
  • Combination Lock (PIC16F84)
  • Low power RFID transponder