AI Synthesis AI010 Switching Attenuator (Current)
It doesn’t do much—but it does it perfectly, quietly, and without hogging space.
Overview
The AI Synthesis AI010 Switching Attenuator is one of those modules you don’t think about until you need it—then you wonder how you ever lived without it. It’s a 2hp Eurorack module that does exactly what its name suggests: attenuate control voltages with a twist. Built as a passive circuit, it draws no power, making it a zero-impact addition to even the most power-crunched skiff. The design is intentionally minimal—two inputs, three outputs, two attenuators, and a clever normalization scheme that lets it double as a passive multiple. It’s not flashy, it doesn’t oscillate or filter or sequence, but in a modular system, that kind of quiet utility is golden.
What sets the AI010 apart from a basic attenuator is its switching jack behavior. Plug into the top input, and you’re feeding two separate attenuated outputs. But leave it unpatched, and that top input normalles to the second attenuator and the third output, effectively turning the module into a three-way passive mult. That kind of flexibility in 2hp is rare, and it’s why this little board shows up in so many builds, especially those trying to maximize function in minimal space. It’s also designed as a DIY project—specifically called out as one of “the perfect first build DIY Eurorack modules for beginners.” The parts only fit one way, which helps, but even so, there’s one rookie mistake everyone warns about: install the panel upside down, and you’ll spend the next hour wondering why your jacks don’t line up.
Specifications
| Manufacturer | AI Synthesis |
| Size | 2hp |
| Depth | 13 mm |
| Current Draw | Module does not draw current |
| Function | Dual passive attenuator with switched jacks that allow the attenuator to also work as a multiple |
| Circuit type | Passive, un-powered circuit using only resistive elements (usually a potentiometer) |
| Normalling | The top-most input is normaled to the second attenuator knob and the third attenuator input. |
| Number of inputs | two in |
| Number of outputs | three out |
| Skiff friendly | yes |
| Output range | Rotating the potentiometer changes the output from 0V to 100% of the input |
Key Features
Passive Simplicity, Zero Power Draw
The AI010 is a textbook example of passive circuit design—no ICs, no power rails, just resistive elements doing the job. The signal path relies entirely on potentiometers to scale down control voltages, whether it’s for modulating a filter cutoff, taming an LFO’s amplitude, or dialing in just the right amount of frequency modulation. Because it’s unpowered, it has no effect on your power supply, making it ideal for skiff builds or systems where every milliamp counts. The output faithfully tracks the input voltage from 0% to 100%, preserving the shape of the incoming CV without distortion or loading.
Switching Jacks & Smart Normaling
The real magic is in the jack configuration. The top input is normaled to both the second attenuator and the third output. That means when nothing is plugged into the top input, it passes the signal through to two additional outputs—effectively acting as a passive multiple. But the moment you patch into the top input, that normalization breaks, and you’re back to two independent attenuators. This dual functionality is what makes the AI010 more than just a space-saving attenuator—it’s a utility player that adapts to your patch.
D.I.Y.-First Design
This module is sold as a DIY build, consisting of a panel and PCB. Assembly is straightforward: solder the jacks and potentiometers to the board, secure the panel, and you’re done. The board includes solder pads for the side supports of the pots, adding mechanical stability—a thoughtful touch for a kit at this price point. It uses “Tall 9mm Trimmer” potentiometers, with the Bourns PTV09A-4025U-B104 listed as a drop-in replacement. The parts are designed to fit only one way, reducing the chance of errors—though as one builder wisely noted, “Watch out for installing the panel upside down!” It’s a small thing, but it’s the kind of detail that sticks with you after your first build.
Collectibility & Value
The AI010 is currently available and priced between $7.00 and $59.00 depending on configuration—ranging from PCB-only to factory-assembled units. A panel and PCB bundle can be had for $20, and AI Synthesis sells the required potentiometers for $1.99 each. Third-party retailers list assembled units as high as $99.00, though prices around $45–$70 are more common. On the manufacturer’s site, it holds a perfect 5.00 out of 5 rating, reflecting its reputation as a reliable, no-nonsense module. While there’s no data on long-term failures or maintenance, its passive design suggests high reliability—there’s simply not much to go wrong. For DIY enthusiasts, it remains a favorite first build: simple, functional, and deeply useful.
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