The first radios were made with galena. The crystal was the demodulator, making it possible to listen to a radio with a sensitive headset, and no need for power - neither from batteries nor from a plug.
The first radios were made with galena. The crystal was the demodulator, making it possible to listen to a radio with a sensitive headset, and no need for power - neither from batteries nor from a plug.
Ha! That's cool to know!
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