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We bring you a marvel of modern science – the Crystal Radio Receiver. You can build one on your own and listen to all your local radio shows on am without electricity or batteries. All you need is a screwdriver! A crystal radio receiver is a very simple radio receiver popular in the early days of the radio. It runs on the power of the radio waves captured by a long wire antenna. All you need is a crystal detector, a capacitor, some copper wires and antenna wires and earphones. The signal is not very strong, but that shouldn’t stop you from listening to your favourite local stations. Surprise your friends with this ingenious contraption that costs you nothing to run – literally!