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Gemstones, Minerals & Fossils
Gemstones and Minerals
Divining rods for sapphire hunting
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<blockquote data-quote="mbasko" data-source="post: 640965" data-attributes="member: 4485"><p>No magic going on there though. The crystal just acts as a diode & were later replaced with germanium diodes (but still known as crystal radios) then modern diodes, more power, amplifiers, greater reception etc. to be able to produce volume through speakers & more + clearer reception. </p><p>Crystal radios still use power but at the very low voltage present in radio signals, thats why you would have used a high impedance earpiece to hear it - not enough power to drive speakers or modern low impedance headphones etc.</p><p>I made one in primary school but unfortunately no longer have it.</p></blockquote><p></p>
[QUOTE="mbasko, post: 640965, member: 4485"] No magic going on there though. The crystal just acts as a diode & were later replaced with germanium diodes (but still known as crystal radios) then modern diodes, more power, amplifiers, greater reception etc. to be able to produce volume through speakers & more + clearer reception. Crystal radios still use power but at the very low voltage present in radio signals, thats why you would have used a high impedance earpiece to hear it - not enough power to drive speakers or modern low impedance headphones etc. I made one in primary school but unfortunately no longer have it. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Divining rods for sapphire hunting
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