Button depression click generator

Details Button depression click generator Button depression click generator

1982-12-29

1985-07-09

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Determining machine or apparatus operating time or...

3281291, 179 2C, 179 90K, 179 84VF, 377107, H03K 2132, H04M 1100, G04F 306

Patent

active

045286817

ABSTRACT:
When using membrane key pads, it is often desirable to provide the user with a sense that contact has been made. In this regard, there is disclosed a 1 KHz 4-bit counter which is normally held at a count just beyond the place where "ones" appear in the third bit position. When it is desired to provide an audio click, the processor resets the counter to zero and then releases the counter. The "ones" in the third bit position, which occur in four consecutive counts, control the application of the 1 KHz frequency to the mechanical sounder. By connecting the fourth bit position to the synchronous reset input, the counter stops incrementing after the four consecutive "ones" and waits for the next reset by the processor.

REFERENCES:
patent: 3579126 (1971-05-01), Paul
patent: 4142177 (1979-02-01), Davis
patent: 4180724 (1979-12-01), Councilman et al.
patent: 4326256 (1982-04-01), Furumoto
patent: 4401847 (1983-08-01), Schneider et al.

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