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You are here: Home / Archives for Security and Alarm

Load Current Control through Current Transformer [Circuit Diagram]

Last Updated on April 14, 2022 by Swagatam 21 Comments

In this post we discuss a circuit which can be used for monitoring or controlling a load current by sensing the load current through a contact less current transformer. Figure […]

Filed Under: Security and Alarm

Solar Stud Light Circuit 

Last Updated on February 1, 2022 by R. Girish Leave a Comment

In this post we are going to explore solar road stud light, what is it? How do they work? And how can we construct our own.  In this post we […]



Filed Under: DIY LED Projects, Mini Projects, Security and Alarm

Simplest Combination Lock Circuit Explained

Last Updated on January 12, 2022 by Swagatam 14 Comments

A electronic combination lock is a device which is designed to activate an electrical solenoid locking system whenever the correct combination of numbers are entered into an attached keypad. To […]

Filed Under: Mini Projects, Security and Alarm

Password Lock Circuit Using IC 4017

Last Updated on January 5, 2022 by R. Girish 6 Comments

In this post we are going to construct a general purpose password based electronic lock circuit without any involvement of microcontroller. You can use this circuit for numerous applications where […]

Filed Under: 4017 IC Circuits, Security and Alarm

Infrared Intruder Alarm Circuit using Photodiodes

Last Updated on May 12, 2022 by Swagatam 2 Comments

The post explains a simple infrared intruder alarm circuit using an infrared transmitter and an infrared receiver module. The transmitter and the receiver photo diodes used in the two modules […]

Filed Under: Infrared (IR), Security and Alarm

Simple Anti-Theft Alarm Circuit to Protect Valuable Items

Last Updated on May 24, 2022 by Swagatam 5 Comments

This easy yet useful security alarm circuit is designed to get triggered in response to even a brief movement of the unit, causing a loud alarm sound to set off. […]

Filed Under: Security and Alarm

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



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