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Security | Electronic circuits

Example: Infrared control system
Electronic circuits archive 

Electronic circuits -> Security

Deer Repellent (18k) This seismic sensor can detect and frighten away intruders.
Digital Combination Lock
Digital combination lock
Digital entry lock
Dongle -serial port (12C508A) This device is NOT a professional dongle. You can use it to protect your software , but you must agree with its major disadvantage: it needs one of the COM ports on your PC. The advantages are the low cost and simplicity.
Door knob alarm (PDF)
Doorphone intercom
Dummy alarm
Economy radar detector
Electronic "snap"
Electronic Card- Lock System
Electronic Code Lock
Electronic door codelock (PIC projects)
Electronic door codelock (PIC16F84)
Electronic lock
Electronic lock
Electronic Security door key 2
Electronic Security door key 1
Electronic Siren
Electronic siren

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