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Electronic circuits archive
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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)
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Economy radar detector
Electronic "snap"
Electronic Card- Lock System
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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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