An AM radio for the apocalypse – wire, a coil, a coin and an earphone with zero batteries needed
It's based on a crystal set type design with an interesting touch where the British penny coin replaces a diode. The video explains and demonstrates how the coin is used to achieve this. Quite incredible and I can see how a prisoner of war would have been able to build such a radio receiver.See https://hackaday.com/2019/11/15/a-radio-for-the-apocalypse/#radio...
