Capacitance switch detection circuitry
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United States of America Patent
Stats
-
Jun 21, 1983
Grant Date -
N/A
app pub date -
Jun 8, 1981
filing date -
Jun 8, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Detection circuitry for a capacitance switch including a source of two-state electrical pulses that are supplied to two clock nodes 180.degree. out of phase, a buffer connected to one of the switch connection nodes, means between the clock nodes and the switch connections to maintain the buffer input at one condition when the capacitance switch is closed and to cause the buffer input conditions and the buffer output signal to vary with the two-state pulses when the capacitance switch is open, and a frequency detector connected to the buffer output.
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