crystal set
radio technology
Quick Summary
A crystal set is a simple radio receiver that uses a crystal detector and no vacuum tubes. The crystal detector relies on the rectifying action at the contact surface between certain crystals, like galena, and a metallic electrode. This technology was first used around 1903 for detectors and by 1921 for complete sets. Crystal sets are a basic form of radio technology, distinct from more complex receivers that utilize vacuum tubes or transistors for amplification and oscillation.123
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