How to Make/Build a Crystal Radio скачать в хорошем качестве

How to Make/Build a Crystal Radio

Step-by-step instructions for making a tunable crystal radio. This is a radio that gets its power from the radio waves. I made it almost entirely from junk except for the diode (1N34 germanium diode) and the earpiece (though you can use a speaker from a phone instead.) The capacitor is made from aluminum foil and a paper towel roll. The coil is rolled on a toilet paper roll. The wire is enameled magnet wire. For the antenna I use a 15 foot wire laid out on the floor. For the earth ground I connect a wire to the ground in the household wiring. I originally got this circuit from the book "Radio Receiver Projects You Can Build" by Homer L. Davidson. For this circuit, the diode must be germanium. The following is a partial list of germanium diodes that should work: 1N34A, 1N60, 1N91, 1N119, 1N270, 1N277, 1N283 The following are not germanium diodes and may need a long antenna or a powerful radio station nearby to work: 1N4148 (silicon, found on a lot of circuit boards), B16 (zener diode), 1N5060 (avalanche diode) I had some links to website for the crystal earpiece (piezoelectric earphone) and/or air core variable capacitors but their websites went away. If anyone has link, feel free to leave a comment and I'll add them here. The 1N34 germanium diode can be found on: https://www.ebay.com/ You can find the circuit diagram shown in this video on this page: http://rimstar.org/equip/crystal_radi... See also: How a Crystal Radio Works    • How a Crystal Radio Works   Crystal Radio Troubleshooting and Tips    • Crystal Radio Troubleshooting and Tips   Make Crystal Earphone/Earpiece for Crystal Radio    • Make Crystal Earphone/Earpiece for Cr...   Use Earbuds/Earphones with Crystal Radio    • Use Earbuds/Earphones with Crystal Radio   Make a Crystal Radio Coil with Taps    • Make a Crystal Radio Coil with Taps   Make Razor Blade Diode for Crystal Radio/Foxhole Radio    • Make Razor Blade Diode for Crystal Ra...   How to Make Crystal Radio Amplifier for Speaker    • How to Make Crystal Radio Amplifier f...   How to Make Amplifier for Crystal Radio Earphone    • How to Make Amplifier for Crystal Rad...   Steps for How to Make Amplifier for Crystal Earpiece    • Steps for How to Make Amplifier for C...   How to Make an AM Radio Transmitter (so you can transmit to your crystal radio)    • How to Make AM Radio Transmitter   Amplitude Modulation with Simple AM Radio Transmitter    • Amplitude Modulation with Simple AM R...   Follow me on Twitter: https://twitter.com/#!/RimStarz http://rimstar.org