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Audio Compression Amplifier /AGC - ElectroSchematics.com
https://www.electroschematics.com/audio-compressor-agc/
This is an audio compressor/AGC (automatic gain control) with an astonishing 75db input voltage range. A P-Channel JFET is used as a variable …
Circuit Design: Automatic Gain Control - Engineers Garage
https://www.engineersgarage.com/circuit-design-automatic-gain-control/
Fig. 4: Circuit Diagram of Automatic Gain Control with Amplifier. The capacitor C1 couples the audio signals from the output of the op-amp to the base of the PNP transistor. The converts the AC signal coupled from the op-amp …
Lecture 31: JFETs as Variable Resistors
http://www.n5dux.com/ham/files/pdf/NorCal%2040A%20-%20PPTs/322Lecture31.pdf
One nice feature of the NorCal 40A is the Automatic Gain Control (AGC). This circuit keeps the audio output at a reasonably constant level as you tune across the band and receive very strong or weak signals. A key part of the AGC is the pair of JFETs Q2 and Q3. These are simply J309s, as we used for the Buffer Amplifier (Q5) and the VFO (Q8).
AN-32 FET Circuit Applications - Texas Instruments
https://www.ti.com/lit/an/snoa620/snoa620.pdf
This 200 MHz JFET cascode circuit features low crossmo-dulation, large-signal handling ability, no neutralization, and AGC controlled by biasing the upper cascode JFET. The only special requirement of this circuit is that lDSS of the upper unit must be greater than that of the lower unit. TL/H/6791–30 FET Op Amp
Simple Audio Circuits - Making Easy Circuits
https://makingcircuits.com/blog/audio-amplifier-circuits-using-fet/
Simple Audio AGC Amplifier The gain of the FET amplifier stage can be simply governed by adjusting the DC gate bias voltage, the gain regulating contrarywise with the voltage. Once the control voltage is obtained from some vital signal point, like the output of a multistage amplifier (via rectification and filtering), and applied to one of many ...
Automatic Gain Control (AGC) circuits
https://designers-guide.org/forum/Attachments/martin_AGC.pdf
the input of the system. Originally, those circuits were described as automatic volume control circuits, a few years later they were generalized under the name of Automatic Gain Control (AGC) circuits [1,2]. With the huge development of communication systems during the …
AGC with FET | All About Circuits
https://forum.allaboutcircuits.com/threads/agc-with-fet.165119/
hello, I have to build an automatic gain control using an FET and an Operational Amplifier, for a phototransistor (SFH314) so that when the signal of an IR LED is weak the AGC maintains the signal, and when the signal is strong reduces it, the gate of the FET I have to control it with the phototransistor detection signal in DC once converted, and the AC signal without …
An All-JFET Amplifier: Exploring Modern JFETs Circuits ...
https://audioxpress.com/article/an-all-jfet-amplifier-exploring-modern-jfets-circuits
An All-JFET Amplifier: Exploring Modern JFETs Circuits. March 24 2021, 13:10. This article describes the design and performance of a high-quality DC-coupled all-JFET amplifier. The circuit was inspired by John Curl and Erno Borbely designs and was built with readily available junction-gate field-effect transistor (JFETs) from Linear Systems.
Automatic Gain Control - AGC Circuit - ElectroSchematics.com
https://www.electroschematics.com/automatic-gain-control-agc/
Automatic Gain Control or AGC is a circuit design which maintain the same level of amplification for sound or radio frequency. If the signal is too low the AGC circuit will increase (amplify) the level and if is to high will lower it to maintain a constant level as possible. The Automatic Gain Control principle is widely use in AM receivers and ...
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