4-Channel Audio Mixer Kit with Arduino Mega – Individual Gain Pots, OLED VU Meter

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Create a studio‑grade 4‑channel microphone mixer that combines four electret signals, lets you set individual gain for each channel, and drives a stereo speaker output – all while a crisp OLED display shows real‑time audio levels under Arduino Mega control. Whether you’re running a multi‑mic podcast set‑up, need a portable conference audio station, or want a custom mixer for your home studio, this kit turns a complex analog‑digital system into a hands‑on build you fully understand.

What You'll Build

A fully functional audio mixer with four MAX9814 microphone inputs, each feeding into a dedicated 10kΩ gain potentiometer. The conditioned signals pass through two TL074 op‑amp stages for clean summing, then a PAM8403 amplifier drives two 3W 8Ω speakers. The Arduino Mega reads the mixed signal, processes it, and drives a 0.96‑inch OLED display as a dynamic VU meter. The entire assembly fits into a supplied enclosure box, giving you a ready‑to‑use device.

What You'll Learn

• Design and build a multi‑channel op‑amp mixer with TL074 quad amplifiers
• Interface MAX9814 electret microphones with adjustable gain and bias
• Program an Arduino Mega to sample audio via ADC and render a VU meter on OLED
• Solder and integrate analog, digital, and power sections on prototype PCBs into a finished enclosure

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Final‑year B.Tech ECE/EEE students building a hardware project for Smart India Hackathon or university evaluations will find this an ideal blend of analog design and microcontroller programming. Independent musicians, podcasters, and live‑event engineers in India can create a custom 4‑channel mixer without hunting for obscure parts across multiple suppliers. ATL Tinkering Lab mentors and advanced hobbyists can use it to demonstrate real‑world audio signal processing and integration.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.

Choose your assembly option:

• Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
• Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.