Transistor switching circuitry having hysteresis

Details Transistor switching circuitry having hysteresis Transistor switching circuitry having hysteresis

1981-12-28

1984-07-31

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307354, 307359, 340663, H03K 5153, H03K 524

Patent

active

044632711

ABSTRACT:
A transistor switching circuit is provided for providing an indication of when the level of an input signal has passed through a first threshold level, such indication continuing unless such input signal has returned beyond the first threshold level to a second threshold level. Such circuit is useful in indicating whether the battery of a battery powered device should be replaced taking into consideration small variations in the output of the battery after the initial replacement indication has been provided.

REFERENCES:
patent: 2939018 (1960-05-01), Faulkner
patent: 3341748 (1967-09-01), Kammiller
patent: 3820099 (1974-06-01), Vogt
patent: 4184087 (1980-01-01), Nutz
patent: 4259601 (1981-03-01), Stein
patent: 4384219 (1983-05-01), Davis

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