Gian Control Circuit | Electronic Project Circuits

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Simple AGC for radio receiver

The automatic Gian control circuit also AGC with audio signal is simplest for compress to signal in the Radio receiver. It is ideal for short wave radio receiver used in areas with weak signals.
You should adjust the master volume control dress until the desired signal intensity. While tuning the receiver to the station light, then gradually tuned to the power station and adjust the AGC pot until the pressure in the hearing as needed.

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Categories: Electronic Control, RF-Radio Frequency Tags: AGC circuit, gian control circuit, Short Wave Radio

Digital gain control of Opamp

The gain of U1 can be controlled by a digital binary 1248 nibble at ABC.
The gain at digital 000 is unity or 1 and the gain at various stages are set by 4051.
There are eight different gains as the steps of gain resistor network is chosen by 4051.
The on resistance of 4051 channel around 100E gets added to U1 pin 2 internal impedance.

You can use separate resistor networks with trimpots for each channel if you require
but keep the networks total burden on U1 pin 6 to around 10K, not less than than.
You can use this to set the gain of a amplifier with the help of a microcontroller.