| 摘要 |
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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