Wireless Infrared Link Circuit

There has been a longstanding interest in constructing a simple VXO transmitter, though concerns regarding the limited tuning range typically associated with VXOs on busy HF bands have been present. The capability to switch between multiple crystals and cover various...

The passive human body infrared sensor circuit

Passive human body infrared sensor circuits are generally similar in design, although some may have fewer stages. The circuit illustrated is sourced from the NICERA manufacturer and is considered a classic example. The front-end stage consists of a low-frequency signal...

Transmitter Servicing Course

With the equipment ready for operation, the main line switch (S-831), the emergency switch (S-12), and the main line contactor contacts (K-831B) are all closed. The keying relay main contacts (K-1C) ground the center tap of the MO filament secondary...

Tuned Radio Frequency (TRF) Receiver

Superheterodyne receivers have been mass-produced since around 1924, but for reasons of cost did not become successful until the 1930s. Superheterodyne receivers represent a pivotal advancement in radio technology, characterized by their ability to convert high-frequency signals into lower intermediate...

Infrared light trap circuit

This infrared light valve has more parts, so it works better and more reliable for alarms. The circuit responds less ambient light. The light valve consists of a transmitter and a receiver. The transmitter consists of a NE 555 which...

how to make remote control circuit from

The proposed remote control circuit can be utilized to control any electrical device within a range of 100 meters. This concept involves modifying an existing remote bell unit circuit, making the process straightforward. However, the construction aspect necessitates electronic assembly...

light gate with counter

The circuit detailed here counts the number of times an infrared beam is interrupted. It can be utilized to track the number of individuals entering a room or to monitor how frequently an object, such as a ball, passes through...

Remote Control Tester

Remote control tester circuit diagram. The tester is designed around the infrared receiver module TSOP1738. The operation of the remote control is indicated by a tone from the buzzer. The circuit is sensitive and has a range of about 5...

Infrared Remote Extender

This project originated from the necessity to remotely control audio-visual equipment located inside cupboards. RF-based commercial units such as those used for... The project aims to develop a system that enables the remote operation of audio-visual devices housed within enclosed spaces,...