If you’ve ever built a crystal radio ... the audio output (see the accompanying block diagram and schematic). This is possible because the radio frequency is so much higher than the audio ...

All that is needed for a basic AM receiver—like a simple crystal radio—is an antenna ... 8-3 represents a schematic version of the block diagram shown in Fig. 8-2. The heart of the AM architecture is ...

Tesla’s Spirit Radio uses a simple crystal radio circuit connected to a computer sound-in jack to generate spooky sounds from all kinds of electromagnetic sources. As you will see, it creeped ...