Circuit for operating a flight navigation indicator

Details Circuit for operating a flight navigation indicator Circuit for operating a flight navigation indicator

1981-01-12

1983-08-16

Crosland, Donnie L.

Communications: electrical

Selective

Having indication or alarm

340 27R, 340 27AT, 343108R, 116289, 73178R, 455155, 33328, G08G 500

Patent

active

043994253

ABSTRACT:
A circuit for use in aircraft navigation equipment includes operational amplifiers to drive a cockpit indicator such as an electric meter linearly over a first predetermined range, constantly over a second predetermined range, and out of view over a third predetermined range. A first operational amplifier circuit provides a linear drive to the indicator and a second operational amplifier circuit controls the constant drive current to the meter and defines first and second breakpoints which begin the constant in view and constant out of view responses, respectively. The circuit needs only a single input signal for operation.

REFERENCES:
patent: 3474407 (1969-10-01), Chesmond
patent: 3806934 (1974-04-01), Hays, Jr.
patent: 3891832 (1975-06-01), Rodgers et al.

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