The regenerative radio is long-ago superseded ... It’s most often seen for AM band receivers or perhaps shortwave ham band ones, but it’s a circuit which also works at much higher frequencies.

[GreatScott] does exactly this in the video after the break, building both a transmitter and receiver. At the most basic level, AM radio works ... 555 transmitter circuits. One uses the control ...

The carrier frequencies for AM operate from 530 kHz to ... 455 kHz signal to go to the demodulator circuit to recover the audio. The following FM radio example illustrates this technique.