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https://en.wikipedia.org/wiki/Crystal_radio
A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio.It uses only the power of the received radio signal to produce sound, needing no external power. It is named for its most important component, a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.
https://www.electronics-notes.com/articles/history/radio-receivers/crystal-radio-set-circuits.php
Crystal radio circuit with variable coupling and tapped coil. This is a very elegant method for adjusting the sensitivity and selectivity to obtain the required performance. During the days when crystal radios or crystal sets were the radio of choice for cost reasons as well as the availability of components, etc, a vast number of circuits came ...
http://peeblesoriginals.com/index.php/catalog/ppp/catlog/visitors/radio-kits.php
Crystal radio kits, tube radio kits, they are all here at Peebles Originals. These radios are designed as they were in the 1950's. You child or grand child will remember the crystal set that they built with you forever. Variable capacitors, coils, books, tubes and sockets and other radio parts are all available at peeblesoriginals.com.
http://www.journeytoforever.org/edu_radio.html
Crystal radio. Crystal radios don't even need a power supply -- they're powered by the radio waves broadcast by the radio station. You can build one for only a few dollars. Building them was a craze in the 1920s, and again in the 1950s, and now it's happening all over again.
http://rexresearch.com/xtlradio/xtlradio.htm
"Three Germanium Diode Crystal Receivers For Beginners" "Two Low-Cost Crystal Sets For Experimenter" "A. "P.W." Ultra Crystal Set" ( Popular Wireless & Wireless Review, 26 June 1926 ) "Build A Variometer Radio" ( Popular Electronics, May 1995 ) "Vest Pocket Crystal Receiver" "Super-Sensitive Vestpocket Crystal Radio" ( Oct.1952 ) "Crystal Set ...
https://www.ebay.com/b/Collectible-Crystal-Radios/165665/bn_3023506
Collectible Crystal Radios. Collectible crystal radios are a part of history. Though not quite as robust or showy as their vacuum tube or transistor counterparts, these devices found their place in our culture by being fun activities the entire family could enjoy.
See what people are saying about Past & Present! Best rock/fossil shop in WNY. Great science toys, books, fossils, rocks, artifacts, and a free museum that rivals most public museums. Don't miss it! Lots of great fossils and paleontological related items to purchase and look at, including dinosaur bones and casts that rival the Buffalo Museum ...
http://www.midnightscience.com/
Dedicated to once again building and experimenting with radio electronics. To order call 405-517-7347 or use the cart on this site. Check out our spider-web coil form on the radio parts page. Check out the "Big Galena Crystal". Nearly 5,000 US radio stations occupy the AM and Extended AM bands: 530-1600 & …
https://www.whio.com/news/local/outage-knocks-out-power-over-3600-clark-county-investigation-reported-near-substation/HDCU4LHAUZFGVPZ6XJSF3YLGOM/
Deputies were familiar with the man and said he “admitted to using Crystal Meth within the past 48 hours and had not slept or eaten since consuming the drug,” according to an incident report.
https://uk.news.yahoo.com/raheem-sterling-among-presenters-guest-070402763.html
England footballer Raheem Sterling, conservationist Dame Jane Goodall and outgoing Chief of Defence Staff General Sir Nick Carter are among the high-profile figures who will serve as guest editors of BBC Radio 4's Today programme over the festive period. The flagship show traditionally hands over the editorial reins to famous faces during the week between Christmas and New Year.
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