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Bird in the Nest Indicator Circuit

Last Updated on July 6, 2019 by Swagatam 4 Comments

The post discusses a simple infrared based proximity sensor circuit which is implemented to study birds and their behavior, by installing the circuit beside artificially made bird nests. The idea […]

Filed Under: 555 IC Circuits, Home Electrical Circuits

DTMF based FM Remote Control Circuit

Last Updated on July 3, 2019 by Swagatam 8 Comments

The post discusses a DTM based FM remote control circuit which can be used for controlling 4 individual appliances remotely by pressing four corresponding buttons on the DTMF transmitter handset. […]



Filed Under: Remote Control

Wheel Rotation Detector Circuit

Last Updated on January 1, 2019 by Swagatam 7 Comments

The post discusses a simple wheel rotation identifier or detector circuit which can be used for ensuring a continuous rotating movement of a concerned wheel through an LED, photodiode arrangement. […]

Filed Under: Sensors and Detectors

Simple FM Radio Circuit Using a Single Transistor

Last Updated on January 28, 2023 by Swagatam 194 Comments

When it comes to making an FM receiver it’s always thought to be a complex design, however the one transistor simple FM receiver circuit explained here simply shows that it […]

Filed Under: Audio and Amplifier Projects, Mini Projects, Radio Circuits, Simple Circuits, Transmitter Circuits

Ultrasonic Weapon (USW) Circuit

Last Updated on June 2, 2022 by Swagatam 97 Comments

transducer driver coil details

The post discusses a simple ultrasonic weapon circuit also called USW, using very ordinary parts such as IC 555 and a few other passive components to generate the required ultrasonic […]

Filed Under: Security and Alarm, Ultrasonic Projects

Make this TV Remote Jammer Circuit

Last Updated on July 3, 2019 by Swagatam 12 Comments

The proposed TV remote jammer circuit can be used for freezing and scrambling all TV remotes under the  specified vicinity.  How TV Remote Works As we all know the fundamental […]

Filed Under: Infrared (IR), Remote Control



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