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Automatic Gain Control Pre-Amplifier Circuit Diagram

2012-12-15 Posted by:electechlab Source:Internet Visits: Comment () Size:L M S

Summary:Automatic Gain Control PreAmplifier Circuit Diagram The preamp circuit uses an easily obtained 741 op amp set for an internal gain about 200. PARTS LISTR1100kΩR2470ΩR310kΩR410kΩR5560kΩR6100kΩR710kΩR810kΩ PRESETR9100kΩC11µF 16VC21µ

Automatic Gain Control Pre Amplifier Circuit


Automatic Gain Control PreAmplifier Circuit Diagram

The preamp circuit uses an easily obtained 741 op amp set for an internal gain about 200.

Automatic Gain Control Pre-Amplifier Circuit Diagram

PARTS LIST R1 100kΩ R2 470Ω R3 10kΩ R4 10kΩ R5 560kΩ R6 100kΩ R7 10kΩ R8 10kΩ PRESET R9 100kΩ C1 1µF 16V C2 1µF 16V C3 10µF 16V C4 1µF 16V C5 0.1µF (104) C6 10µF 16V C7 0.22µF (224) D1 1N4148 D2 1N4148 Q1 BF245 IC1 LM741

A portion of the op amp’s output signal is rectified by the 1N4148 diodes, then filtered and fed to the gate of the FET input shunting circuit. As the output rises, more and more input shunting takes place. That is, more of the input signal is bypassed, effectively keeping the output level constant.

BF245 FET

BF245

This preamp circuit offers a 100:1 limiting action. The input level can change over a 100:1 ratio with little or no effect on the output level.

741-8-pin-ic-configurations-top-view

741 PIN CONFIGURATION

The output output level itself can be set from less than unity all the way up to nearly the gain of the amplifier, making the circuit usable in other applications as well.

Automatic Gain Control PreAmp Circuit Automatic Gain Control PreAmplifier Circuit Automatic Gain Control Pre Amplifier Circuit Diagram


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Tags:Amplifiers
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