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You are here: Home / Archives for Security and Alarm

Power Switch ON Alarm with Auto OFF Circuit

Last Updated on July 6, 2019 by Swagatam 17 Comments

The post discusses a simple monostable based power switch ON alarm circuit which automatically switches OFF after an adjustable preset delay. The idea was requested by Mr. Will Boswell. Technical […]

Filed Under: 555 IC Circuits, Security and Alarm

Laptop Anti-theft Security Alarm Circuit

Last Updated on July 7, 2019 by Swagatam Leave a Comment

The post explains a simple laptop anti-theft alarm circuit which can used with any concerned object such as a laptop which needs to be protected, when an intruder tries to […]



Filed Under: Security and Alarm

DIY Taser Gun Circuit – Stun Gun Circuit

Last Updated on March 23, 2022 by Swagatam 53 Comments

A Taser circuit also known as Stun Gun circuit is one non-lethal electric shock producing unit used to paralyze a person for a time being without causing any severe damage […]

Filed Under: 555 IC Circuits, Security and Alarm

Key Finder or Pet Tracker Circuit

Last Updated on August 30, 2019 by Swagatam 69 Comments

Pets and kids (under 4) have one thing in common, they are curious by nature and love venturing into unknown zones ending up in some sort of mess or trouble. […]

Filed Under: Infrared (IR), Security and Alarm

Flashing LED Battery Low Indicator Circuit

Last Updated on July 11, 2019 by Swagatam 32 Comments

The post explains a simple low/normal battery voltage status indicator circuit through a flashing and a constant LED, where the flashing LED indicates a normal status while the solid indicator […]

Filed Under: 555 IC Circuits, Car and Motorcycle, Security and Alarm, Sensors and Detectors

Simple Shop Shutter Guard Circuit to Safeguard your Shop from Theft

Last Updated on February 23, 2020 by Swagatam 85 Comments

The shop shutter guard circuit discussed here guards your shop when its shutter is closed i.e., at night if an intruder tries to break the shutter, the piezo senses the […]

Filed Under: 555 IC Circuits, Mini Projects, Security and Alarm, Simple Circuits



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