Alarms and security related schematics
- 4 Photo-Detector circuit with delayed release and bipolar output
- 5 Zone alarm circuit
- 5 Zone Alarm Circuit
- 5 Zone Alarm System
- Alarm control keypad
- Arduino Based Security / Automation Sensors
- Automatic Intruder Alarm
- Automatic Intruder Alarm
- Build an iButton electronic lock based around a AT91C2051 microcontroller (includes ASM source code)
- Circuit diagram for basic alarm with delayed trigger
- CMOS single zone intruder alarm
- Cold activated switch (frost alarm)
- Combination Lock (PIC16F84)
- Constructing your own Light Alarm
- Digital combination lock
- Digital combination lock using pair of CD4013 CMOS chips
- Digital Keypad Combination Lock
- Door Alarm circuit diagram
- Door knob alarm (PDF)
- Doorbell for the Deaf
- Easy to build tripwire activated alarm
- Electronic door codelock (PIC16F84)
- Electronic locker digital combination lock circuit diagram
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