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https://en.wikipedia.org/wiki/Crystal_radio
May 23, 2003 · 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 …Estimated Reading Time: 9 mins
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.
https://www.ebay.com/b/Collectible-Crystal-Radios/165665/bn_3023506
In a crystal radio, a single semiconductor gem or mineral (galena being a common choice) is used to transform the radio signals your radio can pick up into audio signals you can listen to. The earliest models of these devices utilized a fine wire just touching the surface of the gem, a setup known as a cats-whisker detector, a title from which ...
Your one-stop-shop for fossils, minerals, crystals, rocks, artifacts, jewelry, toys, books, and other unique gifts! Walk back in time through our free fossil gallery, too! Every crystal lover, science enthusiast and dinosaur aficionado will find something special in our nature store!
http://techlib.com/electronics/crystal.html
The crystal radio gets its name from the galena crystal (lead sulfide) used to rectify the signals. A "cat's whisker" wire contact was moved about the surface of the crystal until a diode junction was formed. The 1N34A germanium diode is the modern substitute for galena and most other germanium small-signal diodes will also work well.
https://www.ebay.com/b/Vintage-Radios/50595/bn_317553
Crystal radios were easily set up at home, and they were also widely used in military institutions. Vacuum Tube Radio - The vacuum tube radio replaced the earlier crystal radios and remained in-demand until the 1950s. The most distinguishing feature of these radios was the heating process that took one or two minutes to start.
https://www.weather.gov/unr/precipitation-past
Monthly Precipitation Total for 2021 (sorted by county) Monthly Precipitation Averages (1981-2010, sorted by county) Daily Regional Temperature and Precipitation Product Issued: 09/05/2021 10:06:57 AM MST. Last Month Precipitation Amounts Issued: 09/04/2021 06:36:29 PM MST.
https://www.personal.psu.edu/jtk187/art2/radio.htm
The radio has been the first device to allow for mass communication. It has enabled information to be transferred far and wide, not only nationally wide but internationally as well. The development of the radio began in 1893 with Nikolai Tesla’s demonstration of wireless radio communication in St. Louis, Missouri.
https://www.energymuse.com/blog/beginners-guide-to-healing-crystals
Oct 30, 2020 · When a crystal comes into contact with your body or your energy, it attunes you to its higher frequency, which allows you to move past mental, physical and spiritual blockages. This boost of positive and uplifting energy can be the difference between darkness and light. The crystal works with your intentions in a similar way.
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