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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

How Contactless Infrared Thermometers Work – How to Make One

Last Updated on February 26, 2022 by Swagatam 4 Comments

In this post we will learn the basic working concept of thermal scanners or contactless IR thermometers, and also learn how to make a practical DIY prototype of the unit […]



Filed Under: Health Related, How to Articles, Infrared (IR), PIR (Passive Infrared), Sensors and Detectors

PIR Burglar Alarm Circuit

Last Updated on March 3, 2020 by Swagatam 26 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

Fiber Optic Circuit – Transmitter and Receiver

Last Updated on January 3, 2020 by Swagatam 9 Comments

Electronic signals have been quite successfully sent for decades through standard “hard -wire” connections, or by using radio links of different kinds which had many disadvantages. On the other hand […]

Filed Under: Infrared (IR), Transmitter Circuits

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

5 Simple Motion Detector Circuits using PIR

Last Updated on July 15, 2022 by Swagatam 109 Comments

A PIR motion sensor alarm is a device which detects the infrared radiation from a moving human body and triggers an an audible alarm. The post discuses 5 simple motion […]

Filed Under: Infrared (IR), PIR (Passive Infrared), Sensors and Detectors

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