Ads
related to: crystal radio earbuds
Search results
Results From The WOW.Com Content Network
Standard headphones used in telephone work had a low impedance, often 75 Ω, and required more current than a crystal radio could supply. Therefore, the type used with crystal set radios (and other sensitive equipment) was wound with more turns of finer wire giving it a high impedance of 2000–8000 Ω.
A crystal earpiece typically consists of a piezoelectric crystal with metal electrodes attached to either side, glued to a conical plastic or metal foil diaphragm, enclosed in a plastic case. The piezoelectric material used in early crystal earphones was Rochelle salt , but modern earphones use barium titanate , or less often quartz .
A crystal radio uses no active parts: it is powered only by the radio signal itself, whose detected power feeds headphones in order to be audible at all. In order to achieve even a minimal sensitivity, a crystal radio is limited to low frequencies using a large antenna (usually a long wire).
Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio. The first headphones were developed in the late 19th century for use by ...
Noise-canceling magic meets crystal clear sound with these AirPods Pro that deliver immersive audio, adaptive transparency and all-day comfort. With the USB-C MagSafe case, charging’s a breeze, too.
a working crystal set (made about 1912) with the crystal/cat's whisker detector clearly visible. Visitors may put the headphones on and listen to BBC Radio Scotland. original Scapa Flow boom defence chart; U-boat radio; spy Suitcase Radio; radios used as Y-stations by Y-service operators; photographic archive of life in "Fortress Orkney"