https://hackaday.com/2011/01/10/555-based-am-radio-transmitter/
555 Based AM Radio Transmitter | Hackaday
Jan 10, 2011 - Bust out that 555 timer and use it to build your own AM radio transmitter. The circuit that [Rtty21] is using only needs the timer chip, an NPN transistor,...
am radio transmitter555basedhackaday
https://hackaday.com/2012/09/04/teensy-board-used-as-an-am-radio-transmitter/
Teensy Board Used As An AM Radio Transmitter | Hackaday
Sep 4, 2012 - [Angus McInnes] has been working on AM radio transmission techniques. He tried out a method of using a VGA port for the task but found the vertical blanking...
as an amradio transmitterteensyboardused