Amplifiers – Having light-controlled or activated device
Patent
1981-03-09
1983-10-25
Mullins, James B.
Amplifiers
Having light-controlled or activated device
330129, 330308, 250229, H03F 1700, G01D 534
Patent
active
044121822
ABSTRACT:
Apparatus is provided for sensing the position of a movable member, such as an audio fader control slider (42), and for controlling an operational characteristic of a controlled device (29), such as the gain of an audio amplifier (34), in accordance therewith. A position detector circuit (26) detects the location of the movable member and provides a first signal indicative thereof. A translation circuit (28) responds to the first signal to provide a second signal representing the value assigned to the position indicated by the first signal. The second signal is applied to the controlled device (29) to control its operational characteristic. The position detection circuit (26) includes elements (24, 36, 38) using radiant energy to detect the location of the movable member.
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patent: 3363106 (1968-01-01), Park
patent: 3619626 (1971-11-01), Rudolph
patent: 3755681 (1973-08-01), Montross
patent: 3835384 (1974-09-01), Liff
patent: 3947692 (1976-03-01), Payne
patent: 4015253 (1977-03-01), Goldstein
patent: 4100420 (1978-07-01), Metcalf et al.
patent: 4122395 (1978-10-01), Schotz et al.
patent: 4342910 (1982-08-01), Pfeifer et al.
Harris Corporation
Mullins James B.
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