Simple Preamplifier Circuit Diagram

This preamplifier circuit is built with an op-amp ic of TL072. The noise is one of the main problems in high-end audio systems. This circuit is a Hi-fi audio preamp used in the new audio systems. The low noise is one of the main characteristics of this circuit.

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Contents

So, in this article, I’m going to explain how to make a preamplifier circuit using Tl072 op-amp ic. Most of the audio devices that not produce power output signals from the audio source board. so this problem will lead to low output sound when amplification through the amplifier.

Then we included the first stage of the preamplifier board to gain more signals from the audio source. This issue is mainly happening with the mic amplifier. you can also use this preamplifier for the microphone. Also, check other related audio amplifier circuits.

Low noise audio preamplifier circuit and explanation

The preamplifier is TL072. Is a dual op-amp plastic packaged ic. This circuit is designed as a stereo preamp. It is a preamplifier with balanced output signals will be provided.

The connected 100k pot on the left and right input of the circuit will allow adjusting the input signal. The 50k pot allows you to balance the left-right signals.

The main advantage of this circuit is

Build with a high-quality ic tl072
Few numbers of external components.
The working voltage is from 12v to 30v dual supply.
Hifi pre-amplifier circuit.
stereo preamp.

Components required

Tl072 ic -1
100k pot -2
50k pot – 1
4.7k resistor – 2
15k resistor – 2
33k resistor – 2
100-ohm resistor – 2
100k resistor – 2
PCB – 1
connecting wires

Pre-amplification of audio input from MIC

Connect the mic wire on the left input or right input. Adjust the liner pot to increase the amplifier sound gain. Then the boosted mic audio signals will get on the output stage.