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.
- 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.
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.