Optical receiver

There is a vast array of TX and RX modules available for microcontrollers. The least expensive option identified was priced at $9.99, which is reasonable, although there are memories of encountering FM receiver modules in the past. The TX (transmitter)...

This document outlines a simple infrared (IR) headphone circuit designed for listening to television or radio without disturbing others. The IR headset is a preferable option for beginners compared to FM headsets due to its desirable sound quality that...

This small receiver with reduced range (weight 9g, dimensions 32 x 25 mm) is suitable for slow-flyer, little boats, etc. The described receiver is designed for applications requiring lightweight and compact components, making it ideal for slow-flying aircraft and small...

A photodiode D1 feeds a high-gain infrared (IR) remote control preamplifier IC, specifically a CA3237E. U2 is a phase-locked loop (PLL) frequency modulation (FM) detector tuned to approximately 100 kHz. The output from the detector is amplified by U3,...

A crystal oscillator is used so that a narrow-band hybrid IF filter can be utilized. This circuit includes aerial and local oscillator circuits for a 27-MHz receiver, intended for the remote control of garage doors, projectors, curtains, and similar...

This circuit is utilized in an impulse speed modulation system. In this system, the transmitter alters the impulse speed of the modulated beam in an optical fiber, allowing it to vary around a center frequency of 50 kHz. The...