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Audio Schematics -
Automatic Gain Control (AGC) Circuits

Audio Level Control Device:  An automatic audio level control device for adjusting the audio level of an appliance in response to changes in ambient sound levels. A microprocessor (16) monitors the ambient sound produced by an audio appliance using a microphone (10) to determine average low and high audio thresholds

Digital Automatic Gain Control Agc

Full wave rectifier has programmable gain - EDN-Design Ideas

Gain of three Amplifier requires no external resistors - EDN-Design Ideas: One IC provides wideband amplification and minimizes parts count.

Gain of two instrumentation Amplifier uses no external resistors - EDN-Design Ideas - Two ICs deliver precision gain with no external components..

Gain programmable circuit offers performance & flexibility - EDN-Design Ideas: You can use a standard precision instrumentation amplifier, such as the INA118 or AD623, as a gain-programmable amplifier with high accuracy and wide gain range. However, the gain range of such parts is fixed at certain values, limiting their flexibility. To solve the problem, a usual way is to use a gain-adjustable circuit controlled by a microcomputer (Figure 1)

High Frequency AGC has Digital Control - EDN-Design Ideas:  As FPGA capabilities increase and time to market decreases, FPGAs gain more acceptance for implementing both data and control paths. Thus, they find wide use as controllers and data path glue logic for fast-page DRAMs. Synchronous DRAMs (SDRAMs)

Low Noise AC Amplifier has Digital Control of Gain & Bandwidth - EDN-Design Ideas: In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR. The input signal level determines the input-stage gain; low-level signals require the highest gain. It is also standard practice in low-noise analog-signal processing to make the circuit's bandwidth as narrow as possible to pass only the useful input-signal spectrum....  In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR. The input signal level determines the input-stage gain; low-level signals require the highest gain. It is also standard practice in low-noise analog-signal processing to make the circuit's bandwidth.

OA-16: OA-16 Wideband AGC Amplifier as a Differential Amplifier - National Semiconductor Application Note

Sync Separator Includes AGC - EDN-Design Ideas This sync separation circuit has a gain-control circuit that helps to stabilize the sync-separation function.

Wideband AGC Amplifier as a Differential Amplifier - National Semiconductor Application Note 10-Apr-2000

Wideband AGC has 60 DB Dynamic Input Range - EDN-Design Ideas

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