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Electronic circuits archive 

Electronic circuits -> Security

5 Zone Alarm
5 Zone alarm circuit
A Basic RF Transmitter for PIR Sensors
Active IR motion detector
Aircore (Metal detector theory) (162 Kb)
Alarm Circuits
Alarm control keypad
Almost Ultrasonic Motion Sensor
Audio Perimeter Monitor
Automatic Emergency Light
Barry's Magnetic Levitation. Magnetic levitator. The pages include complete design details for an antigravity relay to levitate small iron parts.
Basic RDS Encoder Unit
BFO Theory (Metal detector theory) (59 Kb)
Bootstrp/ PLL ( Phase Locked Loop) (Metal detector theory) (33 Kb)
Buzzer Circuit
Car Anti-Theft Wireless Alarm
Car indicator alarm
Cheesemd1 (Metal detector theory-BFO) part1 (181 Kb)
Cheesemd2 (Metal detector theory-BFO) part2 (328Kb)
Combination Lock (PIC16F84)

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