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