Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1986-07-25
1988-03-01
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Percussion-type sound producer
340365S, 324 60CD, 307116, G06F 302
Patent
active
047289317
ABSTRACT:
A charge redistribution capacitance detector is disclosed for detecting whether the capacitance of a variable capacitor is smaller or larger than that of a reference capacitor. First plates of the variable and reference capacitors are connected to a sense node, and a switching device responsive to a clock signal periodically impresses a reference voltage on the sense node during one phase of the clock signal and allows the sense node to electrically float during the alternate phase of the clock signal. Second plates of the sense and reference capacitors are alternately charged and discharged by equal voltage differences in opposite senses during successive clock phases. The voltage on the first plates of the capacitors changes in a sense dependent on the relative capacitance values of the capacitors and is compared with the reference voltage by a comparator which produces a corresponding detector output.
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Linder William J.
Reinke James D.
Caldwell Sr. John W.
Honeywell Inc.
Queen Tyrone
Rubow Charles L.
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