AM radio waves are actually composed of two waves combined together, one is a high frequency wave called the carrier wave and the other is the lower frequency sound waves being transmitted. This hobby sounded like fun. FM radio coil Coil is the important part of the FM tuner. 2018-02-01 - This Pin was discovered by Waldemar Bodys. When it comes to crystal radios, there is nothing revolutionary regarding the CR-1’s basic circuitry but for some odd reason, it has achieved cult-like status as well as high dollar value. and is used to transmit the sound … Download a free copy of their excellent newsletter! Unknown Crystal Radio Receiver - for … Crystal Radio Concept. On the other hand some experimenters claim that they have built them. A wide variety of different types of material were used in the heyday of the crystal radio set. The device uses not only the radio transmission but also a crystal detector without requiring any batteries or AC power. However, there have also been some built for the shortwave bands, and occasionally some for the FM band (88 to 108 MHz). For example, I created this simple yet loud FM crystal radio base on the schematics from one of the members of the China crystal radio forum. Free Antique Radio Schematics and Service Manuals for Vintage Radios, Phonographs, Amplifiers, and Test Equipment. So in essence, a credit card crystal radio would only need: - A flat and foldable ribbon cable(as a coil/antenna), connected to a preferably thin pcb circuit. FACEBOOK Crystal Set Radio Group - A very active group of over 5,000 members with all ranges of experience! As a result, you’ll probably hear several stations at once. For crystal receivers we need a efficiency of at least 0.60 The efficiency is sometimes also expressed as a loss in decibel (dB). Want to make a radio? Military radios of that day, such as the US Army's BC-14/SCR-54, also used antenna tuning, light coupling between stages, a tuned diode section and they operated on the same range of frequencies, 550-1600 KHz. These items have been collected from many sources. I have heard, even from a physicist, that it is impossible to build FM crystal radios. The first part is the actual making of a functional radio, and the second part is making the whole arrangement look nice. your own Pins on Pinterest - A crystal diode - A resistor - And a crystal radio headset - A thin short wire for tap selection - (Optional) a capacitor - (Optional) an antenna and ground hole. Model: Crystal Radio Kit 28-177 - Radio Shack Tandy, Realistic, Material: Plastics (no bakelite or catalin) Shape: Miscellaneous shapes - described under notes. Traditionally, in a crystal detector radio tuned circuits, a mechanical type variable capacitor is used. The different properties of the different types of crystal used in the cat's whisker detectors enabled them to be used in different ways. This radio, as shown on Figure 1, uses a varactor diode instead of the usual mechanical rotary device. The main objectives of this project are, to make a Double-Tuner Crystal Radio Set with: 1) Careful and well thought-out construction practices; 2) As low-cost as possible; 3) Using most-available parts and materials, and 4) Keeping design as low-loss as possible, as … CRYSTAL RADIO SET SYSTEMS - Design, measurement and improvements. NOTE: For people unfamiliar with metric measurements used here 25.4 mm equals 1" This circuit consists of an inductor (also called a coil), a variable capacitor (used to be called a variable condenser), a germanium diode (formerly called a crystal), a filtering capacitor and finally very high impedance headphones. The amplified sound can be heard through the low impedance head phone or small Mylar speakers. 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