Description: Pyrite Crystal Radio Crystal Radio Diode Cast in Brass CupPyrite Crystal Detector ( Actual crystal will vary in shape and size from picture)Crystal mounted and Cast in a 13mm Diameter brass cupCasting alloy is made from Lead, Tin and Bismuth-(NO Cadmium) FACTS ABOUT OLD SCHOOL CRYSTAL DIODES Not every contact position on the Pyrite crystal will perform, so fiddling with the ‘cat's whisker’ to find a sweet spot does take patience and some acquired skill. Cat Whisker:The "cat whisker", a springy piece of thin metal wire, formed the metal side of the junction. Phosphor bronze wire of about 30 gauge was commonly used because it had the right amount of springiness. Cat whisker detector:It consisted of a pea-size piece of crystalline mineral in a metal holder, with its surface touched by a fine metal wire or needle (the "cat whisker"). The contact between the tip of the wire and the surface of the crystal formed a crude unstable point-contact metal–semiconductor junction, forming a diode. The wire whisker is the anode, and the crystal is the cathode; current can flow from the wire into the crystal but not in the other direction.Having a lot of patience and a steady hand are needed when you listen with a piece of the rock. But this can also be very rewarding when you can hear the first station using a cats whisker detector. I can cast custom crystals in any virtually any size and the mineral of your choiceJust send me an eBay message and I can create a new listing of your choice in size and mineral
Price: 6 USD
Location: Dakota, Illinois
End Time: 2024-11-24T16:40:14.000Z
Shipping Cost: 7.6 USD
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Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
