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Home » Security and Alarm » Page 2

How Laser Microphones or Laser Bugs Work

Last Updated on January 20, 2021 by Swagatam 2 Comments

A laser microphone is a security monitoring gadget in which a laser beam is used for detecting audio vibrations across faraway targets, which are normally walls or glass of homes […]

Filed Under: Security and Alarm

Touch Alarm Circuit

Last Updated on August 23, 2021 by Swagatam 2 Comments

The touch alarm circuit senses the mains hum signal from an intruder’s body and raises the alarm sound. This happens whenever an intruder touches a potential element set as the […]



Filed Under: Security and Alarm

Ultrasonic Fire Alarm Circuit using Air Turbulence Detection

Last Updated on October 3, 2020 by Swagatam 4 Comments

The simple ultrasonic fire alarm circuit explained below detects a fire hazard situation by picking up the variations in the surrounding air waves, or the air turbulence. The high sensitivity […]

Filed Under: Security and Alarm, Ultrasonic Projects

Loop-Alarm Circuits – Closed-Loop, Parallel-Loop, Series/Parallel-Loop

Last Updated on September 25, 2020 by Matrix 2 Comments

The article discusses a few simple loop based security alarm circuits, categorized under closed loop, parallel loop, and series/parallel loop. All these designs could be customized and used for a […]

Filed Under: Security and Alarm, Simple Circuits

PIR Burglar Alarm Circuit

Last Updated on March 3, 2020 by Swagatam 20 Comments

The PIR burglar alarm explained here will detect a human intruder within the stipulated range and sound an alarm. Thus, the system could be effectively use for detecting trespassing, theft, […]

Filed Under: Infrared (IR), Security and Alarm

Touch Operated Code Lock Switch Circuit

Last Updated on February 2, 2020 by Swagatam 9 Comments

This touch operated electronic door lock can be used for locking any entrance through a touch keypad. The lock’s touch feature is foolproof and impossible to crack since the touch […]

Filed Under: Security and Alarm



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