Quartz crystal timepiece

Details Quartz crystal timepiece Quartz crystal timepiece

1975-04-24

1976-04-13

Jackmon, Edith Simmons

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

58152H, 340249, G04C 300, G04B 4706

Patent

active

039495450

ABSTRACT:
A battery-powered quartz crystal timepiece is provided with a battery voltage detecting circuit utilizing the threshold voltage of a field effect transistor as a battery failure indicator. The voltage level at which failure is indicated may be selectively controlled by adjusting a load resistance value of the field effect transistor or a voltage divider intermediate the transistor and battery. The battery voltage detecting circuit may operate intermittently, the sampled output of the detecting circuit being stored in a memory circuit.

REFERENCES:
patent: 3641584 (1972-02-01), Okada
patent: 3672155 (1972-06-01), Bergey et al.

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