Uploaded November 2009 | Updated September 2026, 1 hour ago
Half an hour after I completed the last little video, I tore a small speaker out of one of those greeting cards that play music, and made a trivial modification to my original program to do PWM out on pin 9. This makes a nice little Morse sidetone generator.
Half an hour after I completed the last little video, I tore a small speaker out of one of those greeting cards that play music, and made a trivial modification to my original program to do PWM out on pin 9. This makes a nice little Morse sidetone generator.










