Switch debounce circuit

Details Switch debounce circuit Switch debounce circuit

1978-02-23

1979-06-26

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

307247A, H02H 720

Patent

active

041594975

ABSTRACT:
A switch debounce circuit buffers the mechanical contacts of a double throw single pole switch into digital logic. It is essentially an active debounce circuit requiring only one wire from the switch to the circuit. The circuit includes a pair of oppositely connected inverting logic amplifiers with a resistor coupled between the output of one amplifier and the input of the second amplifier. The input from the switch is connected to the same leg of the circuit as a resistor and the output is taken from an opposite leg connecting the output of the second amplifier to the input of the first amplifier. The propagation of logic signals is effected by changing the state of the switch but contact bounce does not effect the logic.

REFERENCES:
patent: 2864007 (1958-12-01), Clapper
patent: 3866092 (1975-02-01), Burns
patent: 4045692 (1977-08-01), Morokawa et al.

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