Multiple range variable resistor

Electrical resistors – Mechanically variable – Movable contact electrically adjustable over length of...

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Details

338148, 338128, 338180, H01C 1032

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active

054883490

ABSTRACT:
A multiple range variable resistor and potentiometer suitable for use in the repair or manufacture of hearing aids and other miniature applications is disclosed. The user of the device can select the desired resistance range thereby allowing one component to be used in many different applications and reducing inventory requirements. It provides increased resistance to contamination of the internal components compared to conventional hearing aid volume controls and is not damaged by over-turning of the control knob in either direction. It can be manufactured for the same cost as conventional single range potentiometers.

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patent: 4021768 (1977-05-01), Stuckey
patent: 4060788 (1977-11-01), Numata et al.
patent: 4978939 (1990-12-01), Zeitvogel
patent: 5004996 (1991-04-01), Shibazaki

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