How to make an audio mixer

Today, we will see how make an audio mixerYou can use it as a basis for creating your audio work and then enhance it by adding elements to the original design.

Audio mixer


- One TL081CP FET amplifier (U1)

- Four 150 k 1/4 W resistors (R1, R2, R3 and R4)

- Two 10 k 1/4 W resistors (R5 and R6).

- A 330 K 1/4 W resistor (R7).

- A 220 Ω 1/4 W resistor (R8).

- Four 47 K rotary or floating potentiometers (P1, P2, P3, P4).

- Four 2.2 μF, 12V electrolytic capacitors (C1, C2, C3, C4).

- A 100 ηF, 50 V ceramic capacitor (C5).

- A 10 μF, 12 V electrolytic capacitor (C6).

- A 4.7 ρF, 50 V ceramic capacitor (C7).

- A 470 μF, 12 V electrolytic capacitor (C8).

- A 22 μF, 50 V electrolytic capacitor (C9).

- A metal box.

- One 15 V battery.

Assembling the mixer

The assembly of this mixer is quite simple, we only have to follow the project drawing. This amplifier can be assembled after creating a printed circuit, where we are going to add each of the elements that make it up with the help of a tin soldering iron.

Audio mixer circuit

We will place our circuit inside a metal box to isolate it and prevent it from picking up noise, so the quality of the audio mix will be much better.

It should be noted that the negative of the tablet must be soldered to the case (by means of a wire) to make the ground connection, which is essential for proper operation. It is also important to connect it to the power supply correctly to avoid operating problems.

The cables to be used for audio inputs and outputs must be shielded to ensure optimum performance.


The audio levels of each of the channels can be controlled with the potentiometers, so the operation is quite simple. This mixer is a four-channel (but can be expanded to ten) mono mixer. If we want a stereo one, we only have to make another identical mixer and connect it in parallel to generate the desired effect.

13 thoughts on “Cómo hacer un mezclador de audio”

  1. I have already made this mixer and it works, the only detail is that the microphone sounds very low and I have already set up an equalizer and it sounds double but it is still very low, what should I modify to make the microphones sound harder? Do I change the 47K potentiometers for 100K potentiometers? Or change the resistor R1 for one of what value because I am a novice. those who say that it is incomplete or is not explained correctly should do some research and study a little because I think the level of difficulty is a 7 on a scale of 1 to 10 ....

    1. You should put a preamp stage on each input if you are going to use microphones, there are many easy to make circuits on the internet, just add it to the input of each channel and feed it with a separate power supply.

  2. Hello, could you help me if you can upload the printed circuit of this project, I'm interested, thank you.

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