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The first commercially successful type of electrical phonograph pickup was introduced in 1925. Although electromagnetic, its resemblance to later magnetic cartridges is remote: it employed a bulky horseshoe magnet and used the same single-use steel needles which had been standard since the first mechanical transfer disc record players appeared in the 1890s.
Harold "Harry" DeArmond (January 28, 1906 – October 12, 1999) was an industrial designer of electrical components. His younger brother John was a budding guitarist at age 10 but wanted to make his guitar louder and better-sounding, and in 1935 created a magnetic pickup using components from the ignition coil of a Ford Model A. Harry realized ...
A typical magnetic pickup is a transducer (specifically a variable reluctance sensor) that consists of one or more permanent magnets (usually alnico or ferrite) wrapped with a coil of several thousand turns of fine enameled copper coil. The magnet creates a magnetic field which is focused by the pickup's pole piece or pieces. [2]
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This page was last edited on 8 August 2009, at 01:32 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
The built-in magnet allows you to pick up metal items like nails, keys and coins with ease. ... Carrying a heavy laundry basket around the house is for the young'ins. Save your back and knees with ...
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