How on earth could a single transistor form the heart of a radio receiver with enough sensitivity and selectivity to be useful, you ask? The answer lies in an extremely clever circuit: the ...

[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.