Rediscovering the magic of wireless communication

Ashish Derhgawen’s article on rediscovering the magic of wireless communication: In this article, I will tell you the story behind one of the most important technological inventions of modern times – wireless communication. I will also describe some of my own experiments with high voltage spark transmitters and coherers! But before I talk about those, […]

Eddystone EC10 communication receiver restoration and PSU add-in

Dilshan Jayakody writes: Recently I got vintage Eddystone EC10 MK1 communication receiver from friend of mine and it is completely dead when it comes to me. EC10 MK1 is one of Eddystone’s very early solid state communications receivers and it use 10 PNP Germanium transistors. This receiver cover 550 kHz to 30 MHz and come […]

App note: Demodulating communication signals of Qi-Compliant low-power wireless charger using MC56F8006 DSC

An app note (PDF!) from Freescale Semiconductor providing a complete solution to demodulating communication signals from power wave with MC56F8006 DSC: This application note aims to describe the Qi communication data demodulation design for wireless charger transmitter with MC56F8006 digital signal controller (DSC) including Qi communication interface, demodulation circuits design, and demodulation software design.

App note: Implementing bidirectional interface with a single common LED

Here is an app note from Mitsubishi Electric Research Laboratories describing how to implement short-range low-bandwidth bidirectional communication using common LEDs. It’s called LEDComm and requires only two pins of a microcontroller and a current limiting resistor to function. It works by making use of the fact that LEDs, once reverse biased, are also pretty […]