[Billy Cheung] decided to build a crystal radio using a rather ... you’re listening to AM radio. Oh, and don’t forget an antenna! [Billy] breaks down the details for anyone wishing to ...

Most crystal radio receivers have a decidedly “field ... chunky knobs and homebrew rotary switches for band selection and antenna. As nice as the details on the electronics are, it’s the ...

The earliest and cheapest radio set for the home was the crystal set. The essential components were a fragile fine wire (the 'cat's whisker') acting as an aerial connected to a small piece of ...