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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 ...
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.
From the advent of radio broadcasting, the company made headphones, radios, amplifying devices and loudspeakers for the domestic market. [ 1 ] When World War II started, in order to increase the company's productive capacity, the Admiralty financed an extension to the factory which the company ran on the Admiralty's behalf.
37-009 – AM radio headphones; 37-001w – headphones; 37-002 – headphones; Model 2007 was demonstrated at the 1975 Winter Consumer Electronics Show, with a price of $399 (equivalent to $1,896 in 2019). 37-004 – dynamic headphones; 3006 – a pair of speakers; S-45 – stand for 2005 and 2007 models
A crystal radio using piezoelectric earpiece A crystal earpiece is a type of piezoelectric [ 1 ] earphone , producing sound by using a piezoelectric crystal , a material that changes its shape when electricity is applied to it.
The Realistic DX-60 is a multiband radio. The radio receives 3 MHz to 27 MHz AM shortwave in three bands, 26.965 MHz through 27.405 MHz HF CB in one band, 540 kHz to 1620 kHz standard AM broadcast in one band, and 87 MHz to 108 MHz monaural standard broadcast FM. The DX-60 existed in two versions, model 12-764 and a nearly identical but ...