A simple fm radio transmitter circuit which covers frequencies from 88 to 108 MHz. It is built with 3 transistors: BC109, BFR91A and BFR96S. It is quite stable and the output power is around 200 mW.

AM radios are relatively simple devices, and building one is a good way to start exploring the world of radio communications. [GreatScott] does exactly this in the video after the break, building b… ...

When focusing on batteries, designers should use both highly efficient transmitter and receiver circuits, along with a well-disciplined protocol.

This infrared tranmitter is intended for use with this infrared receiver. It works with 2 – 1.5V batteries or a 3V lithium battery. To give a compact infrared device assembly and still a good ...

For the first time, researchers have used a laser as a radio transmitter and receiver, paving the way for towards ultra-high-speed Wi-Fi and new types of hybrid electronic-photonic devices.

Connect the transmitter to your device and turn them both on. Then tune your radio receiver to the frequency on the transmitter.

The transmitter was actually a pretty simple circuit, just a crystal-controlled oscillator and an RF amplifier really, but still managed about 1.5 Watts output on the 80-meter ham band.

In 1901, Marconi sent a signal across the Atlantic using the recently discovered radio waves. It paved the way for today's complex wireless communications systems such as satellites and mobile phones.

There’s a big reason those enormous AM radio transmitter towers are surrounded in fences: touching them can be incredibly dangerous on account of the enormous amounts of power pushed through ...