Initially we build a transmitter and receiver to communicate between Arduinos using Morse code sent by pulses of light waves. Next, we consider digital music, which we create by switching a voltage on ...

Also, 15 WPM seems a bit slow for a computerized morse code transmitter ... Please note that I’m using an online receiver in the video, and there is a 9s lag.

The Morse key is a switch that connects and disconnects the 12V power to the rest of the circuit. It has a wooden knob on the top, which makes tapping out the Morse code easier.

If you’re looking for a simple way to make an RF transmitter, check out [Tomasz]’s Morse code transmitter. His design uses nothing more than a microcontroller and a 16MHz crystal to tra… ...

The technology is old and Morse Code complicated, ... By his 20s, he had scrounged up an old radio receiver and “an old transmitter where you had to plug in a crystal,” he said.

Creed automatic morse equipment, manufactured by Creed and Company Limited, Croydon, London, England, 1925. Comprising No. 9 morse keyboard perforator; No. 11 morse automatic transmitter; No. 10 ...

On December 12, 1901, Italian-born radio inventor Guglielmo Marconi, at St. John's, Newfoundland, heard three dots the Morse Code letter "S" sent by his company transmitting station at Poldhu ...