Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1987-11-25
1989-08-29
Karlsen, Ernest F.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250227, 324115, 324123R, H01J 4014, G01R 1508, G01R 130
Patent
active
048619787
ABSTRACT:
An automatic gain setting circuit for automatically adjusting the gain of an amplifier which drives an analog meter. The gain of this amplifier is adjusted automatically with the push of a button switch so that the meter will read mid-range for the signal input to the amplifier. In this circuit, the operational amplifier is connected between an input signal and the analog meter readout. This operational amplifier utilizes a feedback circuit having a variable resistance which changes the gain of the amplifier as the resistance is changed. The resistance in this feedback circuit is changed by an electrical comparison circuit which compares the output signal from the amplifier with a reference voltage upon the push of a button switch. The reference voltage is preset to cause the meter to read mid-range. Once the button switch is pushed, the comparison circuit provides an output control signal which is directed to the feedback circuit of the operational amplifier. This control signal, in effect, varies the resistance in the amplifier feedback circuit so as to adjust the gain of this amplifier. The signal output of this amplifier is automatically increased or decreased until the magnitude of the signal output corresponds to the preset reference voltage which in turn corresponds to a mid-range reading of the meter. The gain of the operational amplifier is then maintained until the button switch is pushed again.
REFERENCES:
patent: 3159787 (1964-12-01), Sexton et al.
patent: 4682022 (1987-07-01), Hoult et al.
Conover Richard C.
Karlsen Ernest F.
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