Circuit for driving a signaling device

Details Circuit for driving a signaling device Circuit for driving a signaling device

1997-09-15

1999-06-15

Hofsass, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

3404502, 340450, 340435, 324601, 73304R, B60Q 100

Patent

active

059126175

ABSTRACT:
A circuit for controlling the reserve lamp of a vehicle's fuel level indicator instrument. The circuit uses a switch controlled by an extremely asymmetric clock signal periodically to switch, for a very short time, the signal provided by the level sensor coupled to a comparator operable to compare this signal with a threshold value for the purpose of determining the state of the reserve lamp.

REFERENCES:
patent: 4513277 (1985-04-01), Moore et al.
patent: 5408418 (1995-04-01), Lippmann et al.
patent: 5506564 (1996-04-01), Hargest

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