Amplifiers – With amplifier condition indicating or testing means
Patent
1977-03-24
1978-08-22
Dahl, Lawrence J.
Amplifiers
With amplifier condition indicating or testing means
324 99D, 324123C, 330 51, 330 86, H03F 100, H03F 136
Patent
active
041092139
ABSTRACT:
A circuit for adjusting the amplitude of a reference signal to a predetermined level so as to permit subsequent data signals to be interpreted correctly. The circuit includes an operational amplifier having a feedback circuit connected between an output terminal and an input terminal; a bank of relays operably connected to a plurality of resistors; and a comparator comparing an output voltage of the amplifier with a reference voltage and generating a compared signal responsive thereto. Means is provided for selectively energizing the relays according to the compared signal from the comparator until the output signal from the amplifier equals to the reference signal. A second comparator is provided for comparing the output of the amplifier with a second voltage source so as to illuminate a lamp when the output signal from the amplifier exceeds the second voltage.
REFERENCES:
patent: 3159787 (1964-12-01), Sexton et al.
patent: 3539936 (1970-11-01), McGhee
patent: 3760287 (1973-09-01), Harris
Fletcher James C. Administrator of the National Aeronautics and Space
Holley Larry D.
Ward James O.
Dahl Lawrence J.
Harrell James O.
Manning John R.
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