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 60C, 324 60CD, 307116, 361131, G06F 302
Patent
active
047289325
ABSTRACT:
A method and circuit are disclosed for detecting the state of a variable capacitor by comparator means whose threshold voltage is impressed on first plates of the variable capacitor and a reference capacitor having a capacitance between the minimum and maximum capacitances of the variable capacitor, and charging and discharging the second plates of the variable and reference capacitors by equal amounts in opposite senses. The voltage on the first plates of the capacitors then changes in a sense dependent on the relative capacitance values of the capacitors and is compared with the threshold voltage by the comparator means.
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Caldwell Sr. John W.
Honeywell Inc.
Oberley Alvin
Rubow Charles L.
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