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Home » Security and Alarm » Page 3

Gadgets to Protect Women from Assaults and Harassment

Last Updated on January 16, 2020 by Swagatam 8 Comments

Gadgets and devices that are specially designed to repel or deter a potential male offensive can be used by a girl to protect herself from a crime situation, and therefore […]

Filed Under: Security and Alarm

Photodiode, Phototransistor – Working and Application Circuits

Last Updated on October 5, 2019 by Swagatam 16 Comments

Photodiodes and phototransistors are semiconductor devices which have their p-n semiconductor junction exposed to light through a transparent cover, so that external light can react and force an electrical conduction […]



Filed Under: Electronic Devices and Circuit Theory, Electronics Tutorial, Infrared (IR), Mini Projects, Security and Alarm, Sensors and Detectors

9 Useful LDR Circuits Explained

Last Updated on April 14, 2022 by Swagatam 26 Comments

In this post we explore 9 circuit ideas that uses LDR light sensor to trigger a load ON/OFF through a relay. These circuits are mostly triggered by the absence or […]

Filed Under: Datasheets, Mini Projects, Security and Alarm, Sensors and Detectors

Anti Spy RF Detector Circuit – Wireless Bug Detector

Last Updated on July 19, 2021 by Swagatam 39 Comments

A anti-spy or bug detector circuit is a device that detects hidden wireless electronic devices such as wireless microphones, spy cameras, Wi-Fi devices, GPS trackers or any gadget that emits […]

Filed Under: 324 IC Circuits, Mini Projects, Security and Alarm

PIR Sensor Datasheet, Pinout Specifications, Working

Last Updated on October 2, 2021 by Swagatam 38 Comments

PIR Sensor internal composition, layout and configuration

In this post we are going to explore the datasheet of PIR or Pyroelectric Infrared Radial Sensor HC-SR501. We will understand for what purpose PIR sensor is used? Its basic […]

Filed Under: Datasheets, Infrared (IR), PIR (Passive Infrared), Security and Alarm

Patient Drip Empty Warning Indicator Circuit

Last Updated on July 6, 2019 by Swagatam 33 Comments

In this post we will learn about a simple mechanism, and a circuit which will enable a patient’s IV drip bottle system to sound an alarm whenever it gets almost […]

Filed Under: 4017 IC Circuits, Security and Alarm



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