pulling radio signals out of thin air as if by magic. Not all crystal sets take this slapdash approach, of course, and some, like this homebrew multiband crystal receiver, aim for a feature set ...

Crystal radios can feel magical, given their ability to tune in audio from distant stations with nothing but the energy from the radio signal itself. However, to achieve this feat, they typically ...

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 ...