AI Synthesis AI002 Mixer
Three inputs, one clean mix, and your first real taste of active Eurorack circuitry—this little 6 HP kit is a quiet rite of passage.
Overview
If you’ve ever stared at a blank Eurorack case and wondered where to start without blowing your budget or your confidence, the AI Synthesis AI002 Mixer isn’t just a module—it’s a handshake. It’s the kind of build that doesn’t ask you to decode cryptic schematics or wrestle with surface-mount parts. Instead, it hands you a PCB, a panel, three jacks, and a set of Alpha pots, then says, “Go.” No wiring, no jumpers, no guesswork—just through-hole components that slide in cleanly and solder up fast. And if you can build this in under an hour, as many owners report, you’ll still walk away with something that feels earned.
This is an active audio/CV mixer, which means it’s not just passively summing signals like a patch bay—it’s amplifying them slightly, giving you headroom and control. That matters when you're blending oscillators, layering LFOs, or summing control voltages into a filter cutoff. It’s DC-coupled, so it handles CV just as cleanly as audio, making it a utility player that pulls double duty. The three inputs each have their own level control, letting you balance sources precisely before they hit the summing stage. Then, at the output, you’ve got a master knob that’s calibrated so unity gain lands right at 12 o’clock—any further, and you start to overdrive the opamp gently, adding a touch of color if you want it.
It’s not flashy. There’s no modulation input, no inversion switch, no panning or filtering. But that’s the point. The AI002 is stripped back to the essentials: mix three things, control each one, send the result out cleanly. It’s the kind of module you don’t notice until it’s missing—like a power supply or a blank panel. But once it’s in your case, you’ll patch to it every day.
Specifications
| Manufacturer | AI Synthesis |
| Number of inputs | 3 |
| Input controls | All three inputs have a level control |
| Summing mixer position | The summing mixer is at Unity when at 12’0 Clock |
| Dimensions | 6 HP |
| Depth | 20 mm |
| Current Draw | 4 mA +12V, 4 mA -12V, 0 mA 5V |
| Coupling | DC-coupled |
Key Features
Active Circuitry, Beginner-Friendly Build
The AI002 Mixer is an active module, meaning it uses an opamp to sum and buffer the signal path—this isn’t a passive resistor network that saps level and headroom. For builders, that’s a meaningful step up. It introduces the concept of bi-polar power supplies (+12V and -12V), which is fundamental to Eurorack but can feel intimidating the first time you wire a power cable. Here, it’s handled cleanly: the kit includes a pre-made power cable, and the PCB has decoupling capacitors (2 x .1uF) placed right at the power entry points to stabilize the rails. That’s good design hygiene, and it teaches you to care about power integrity from day one.
True Plug-and-Play Assembly
Every part in the kit is through-hole—no tweezers, no magnifier, no frustration. the jacks are high-quality 3.5 mm types, and the pots are genuine Alpha units, which means they’ll last. You don’t need to cut wires or route connections; everything mounts directly to the board. The whole thing slots into a Eurorack panel that’s included, and once built, it fits neatly into any standard case. It’s been called “a great first active build,” and that’s not just marketing—owners report learning real lessons here, like how grounding works or why power decoupling matters. One builder on ModWiggler even admitted they’d underestimated how tricky stripboard could be, which made the switch to a proper PCB feel like a revelation. The AI002 removes that barrier entirely.
Unity Gain and Gentle Overdrive
The output knob isn’t just a volume control—it’s a precision tool. At 12 o’clock, the mix hits unity gain, meaning you’re not boosting or cutting the summed signal. Turn it past that point, and the opamp starts to saturate slightly, adding a soft, musical overdrive. That’s not distortion in the aggressive sense, but more like the warmth you’d get from pushing an analog console. It’s subtle, but useful—especially when you want to glue together multiple oscillators or give a CV source a little extra punch. Because the module is DC-coupled, that overdrive behavior applies just as well to control voltages, which can be a creative tool in itself.
Historical Context
The AI002 Mixer is an updated take on a classic utility audio or CV mixer, designed to be approachable without sacrificing functionality. It emerged as part of a small wave of DIY-first Eurorack kits aimed at lowering the entry barrier for synth builders. Rather than reinvent the wheel, it refines a proven concept: clean summing with individual attenuation. It’s positioned as “the perfect first build DIY Eurorack module for beginners,” and it shares that role with two other kits from AI Synthesis—the AI001 Multiple and the AI010 Switching Attenuator. Together, they form a suggested beginner trio, each teaching a different foundational concept: signal splitting, mixing, and voltage control. The AI002 sits at the heart of that progression, bridging the gap between passive and active circuitry.
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