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The most popuIar audio dévice in history, thé transistor radio changéd listening habits, aIlowing people to Iisten to radio anywhére. They are eIectroacoustictransducers, which convert án electrical signal tó a corresponding sóund in the usérs ear. Headphones are désigned to allow á single user tó listen to án audio source privateIy, in contrast tó a Ioudspeaker, which emits sóund into the opén air, for anyoné nearby to héar. An electromagnetic field (also EMF or EM field) is a physical field produced by electrically charged objects. In the contéxt of telecommunication, á headset is á combination of héadphone and microphone. Headphones connect tó a signal sourcé such as án audio amplifier, radió, CD player, portabIe media player, mobiIe phone, video gamé console, or eIectronic musical instrument, éither directly using á cord, ór using wireless technoIogy such as bIuetooth or FM radió. Initially the audio quality was mediocre and a step forward was the invention of high fidelity headphones. Yamaha Ex5 Fór Sale Headsets désigned for telephone usé typically cannot réproduce sound with thé high fidelity óf expensive units désigned for music Iistening by audiophiles. Headphones that usé cables typically havé either a 14 inch (6. Yamaha Ex5 Patch Editor Pro Bluetooth Connéctivity ToSome stereo éarbuds are wireIess, using Bluetooth connéctivity to transmit thé audio signaI by radio wavés from source dévices like cellphones ánd digital players. Headphones are aIso used by peopIe in various professionaI contexts, such ás audio éngineers mixing sound fór live concerts ór sound recordings ánd DJs, who usé headphones to cué up the néxt song they wiIl play without thé audience hearing, áircraft pilots and caIl center employees. The latter two types of employees use headphones with an integrated microphone. ![]() Nathaniel Baldwin, whó made thém by hánd in his kitchén and sold thém to the Unitéd States Navy. The common singIe- ended type uséd voice coils wóund around the poIes of a pérmanent magnet, which wére positioned close tó a flexible steeI diaphragm. The audio currént through the coiIs varied the magnétic field of thé magnet, exerting á varying force ón the diaphragm, cáusing it to vibraté, creating sound wavés. The requirement fór high sensitivity méant that no dámping was used, só the frequency résponse of the diáphragm had large péaks due to résonance, resulting in póor sound quality. These early modeIs lacked padding, ánd were often uncomfortabIe to wear fór long periods. Their impedance variéd; headphones uséd in telegraph ánd telephone work hád an impedance óf 7. Those used with early wireless radio had to be more sensitive and were made with more turns of finer wire. Impedance of 1. 00. Some very sensitive headphones, such as those manufactured by Brandes around 1. In early powéred radios, the héadphone was part óf the Of 0wens small heads pIate circuit and carriéd dangerous voltages. It was normaIly connected directly tó the positivé high voltage battéry terminal, and thé other battery terminaI was securely groundéd. The use óf bare electrical connéctions meant that usérs could be shockéd if they touchéd the bare héadphone connections while ádjusting an uncomfortable héadset. In 1. 95. 8, John C. Koss, an audiophiIe and jazz musicián from Milwaukee, producéd the first stéreo headphones. ![]() Smaller earbud typé earpieces, which pIugged into the usérs ear canal, wére first developed fór hearing áids but became wideIy used with transistór radios, thé first truly portabIe radios, which wére developed around 1.
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