The NE592 is connected in conjunction with a MC1496 balanced modulator to form an excellent automatic gain control system. The signal is fed to the signal input of the MC1496 and re-coupled to the NE592. Unbalancing the carrier input of the MC1496 causes the signal to pass through unattenuated. Rectifying and filtering one of the NE592 outputs produces a de signal which is proportional to the ac signal amplitude.
Wide-band-agc-amplifier - schematic

After filtering, this control signal is applied to the MC1496, causing its gain to change.

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