Capacity responsive control circuit
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United States of America Patent
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May 16, 1989
Issued Date -
N/A
app pub date -
Jan 27, 1988
filing date -
Sep 29, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A capacitive detecting circuit for detecting transient capacitive changes such as that of a person moving into proximity of a sensing element. A sensing element is coupled to a threshold level controlled amplifier supplied with relatively high frequency signals from an oscillator through a high input impedance. A detector circuit is coupled to the amplifier output to detect D.C. variations in the level control loop caused by transient capacitive changes and provide a control output signal representative of such change.
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