Battery voltage regulating and condition indicating circuit for

Details Battery voltage regulating and condition indicating circuit for Battery voltage regulating and condition indicating circuit for

1977-05-16

1978-11-28

Kreitman, Stephen A.

Measuring and testing

Gas analysis

By vibration

324 65R, 340632, G01N 2718

Patent

active

041270240

ABSTRACT:
A voltage regulating circuit is provided for low voltage battery-powered measuring instruments of the type using electrically-heated filaments as sensing elements. The circuit includes an indicating signal light which is energized from a separate control power source and controlled by the voltage regulating circuit and also in response to energization of a filament in the instrument. The light is turned OFF in case of failure of the control power or of inability of the voltage regulating circuit to maintain the desired voltage. The light is also turned OFF for a set time period upon energization of the filament to allow the filament to stabilize at its normal temperature. Thus, when the indicator light is ON an indication is provided that the instrument is in condition for use.

REFERENCES:
patent: 3478579 (1969-11-01), Whitmore
patent: 3482233 (1969-12-01), Ogg
patent: 3678489 (1972-07-01), Scherban et al.
patent: 3879717 (1975-04-01), Gruensfelder
patent: 4007456 (1977-02-01), Paige et al.

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