Apparatus for generating an alarm sound

Details Apparatus for generating an alarm sound Apparatus for generating an alarm sound

1977-04-28

1978-08-08

Jackmon, Edith S.

58 19R, 58 575, G04C 2128, G04B 2312

Patent

active

041048628

ABSTRACT:
In apparatus for generating an alarm sound especially for small watches, all functions of the alarm are controlled by integrated circuitry which detects the state of a common connection point between a manually operable switch and a reference switch which is opened and closed by the timekeeping mechanism. There is thus only one external terminal led out from the integrated circuit for the purpose of connecting to the output side of the reference switch and the manually operable switch. The reduction in the number of terminals permits a corresponding reduction in the number of pins required and a reduction in the size of the circuit. The integrated control circuit includes flip-flops, gate circuits, inverters and a five minute counter.

REFERENCES:
patent: 4016562 (1977-04-01), Gerum
patent: 4060973 (1977-12-01), Martino

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