Amplifier system with alternate inputs

Details Amplifier system with alternate inputs Amplifier system with alternate inputs

1977-08-15

1980-01-22

Hix, L. T.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

361178, 340622, 340625, H01H 3518

Patent

active

041852079

ABSTRACT:
An amplifier system includes an operational amplifier having a reference applied to one input terminal. A voltage above or below the reference voltage is applied to the other input terminal by way of an interface circuit. The interface circuit adapts the input for use with a switch or, alternatively, the interface may be disabled to permit use of a variable resistor input such as a thermistor. The output of the operational amplifier may be a switching circuit. The amplifier system is adapted for use in a fluid level system to permit the alternate use of a switch type or thermistor level sensor.

REFERENCES:
patent: 3558909 (1971-01-01), Janson
patent: 3750036 (1973-07-01), Burrows et al.
patent: 3849674 (1974-11-01), Nettles
patent: 4068138 (1978-01-01), Miyakawa et al.

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