ADDAC 300 (2010s–2020s)

A tiny, two-channel voltage regulator that doesn’t make sound—but can make any other module in your rack scream, stutter, or dissolve into lo-fi static with just a twist.

Overview

It doesn’t oscillate, filter, or sequence. It has no waveform, no envelope, no patch points for audio. And yet, the ADDAC 300 might be one of the most sonically transformative modules in the entire Eurorack ecosystem. Because instead of generating sound, it starves it—deliberately, surgically, and with glorious unpredictability. The ADDAC 300 is a dual power starvation module, a tool for reducing the ±12V rail voltage supplied to other modules, forcing them to operate outside their design specs and triggering everything from subtle saturation to full-on circuit meltdown. It’s not effects in the traditional sense; it’s more like sabotage with a bypass switch. Turn a pristine analog delay into a warbling cassette nightmare. Make a clean VCF choke and splutter like a misfiring engine. Turn a digital oscillator into a glitchy, stuttering artifact of its former self. The results aren’t always musical, but they’re always interesting.

Born from the DIY circuit-bending ethos where starving a chip of power was one of the first tricks in the book, the ADDAC 300 brings that chaotic energy into the modular world in a safe, reversible, and patchable form. It’s not just a novelty—it’s a compositional tool. Artists chasing degraded textures, lo-fi artifacts, or unstable timbres have found it indispensable. The module sits quietly in your rack, a silent puppeteer, pulling the power strings of whatever it’s connected to. And because it’s dual-channel, you can apply different levels of starvation to two separate modules simultaneously, creating evolving interplay between two destabilized circuits. It’s not for every patch, but when you need something to sound like it’s falling apart—on purpose—the ADDAC 300 is the scalpel you reach for.

Specifications

Key Features

Dual Independent Starvation Channels

The ADDAC 300 gives you two completely separate power regulation paths, each with its own voltage control pot and bypass switch. This means you can starve a filter on one channel and a delay on the other, dialing in different levels of instability across your patch. The controls are simple—just a knob per rail per channel—but the effect is profound. Turning the knob reduces the voltage supplied to the connected module, and because analog circuits behave unpredictably under low power, the sonic results are rarely linear. A filter might start resonating erratically, a VCA might gate unpredictably, or a digital module might start skipping steps. The bypass switches are essential for A/B comparisons, letting you hear the difference between full power and creative failure in real time.

Trimmed for Control, Not Chaos

While the knobs give you real-time control over voltage reduction, the module also includes internal trimmers that let you set a minimum voltage plateau. This is crucial because many modules will shut down completely somewhere between 3V and 10V, and without a floor, you’d lose all functionality too quickly. By adjusting the trimmer, you can ensure that even at the lowest knob setting, the module still receives enough power to operate—just not well. This turns the pot into a “degradation dial” rather than an on/off switch, letting you explore the full spectrum of unstable behavior without killing the signal entirely. It’s a small detail, but it transforms the module from a blunt instrument into a precision tool for sonic decay.

Built for the Bends

The ADDAC 300 doesn’t try to sound vintage—it makes other modules sound vintage, or broken, or like they’ve been left in a damp basement for 30 years. It excels with analog processors: filters, delays, mixers, and preamps all respond beautifully to power starvation, often producing harmonically rich distortion, warbling modulation, and unpredictable gating. Digital modules can be even more extreme, with clock instability, bit reduction, and glitching effects emerging as voltage drops. But it’s not just for noise and chaos. Subtle starvation can add warmth and compression to a clean signal path, similar to running gear on slightly underpowered wall warts—a trick some engineers used on vintage synths to soften their output. The ADDAC 300 just makes that technique repeatable, patchable, and reversible.

Historical Context

The ADDAC 300 emerged during the mid-2010s Eurorack boom, a time when modular synthesis was shifting from boutique curiosity to mainstream tool for electronic musicians. As racks filled with pristine digital oscillators and clean VCAs, a counter-movement began pushing for more organic, unstable, and unpredictable sounds. Circuit bending, once the domain of garage tinkerers with soldering irons, started influencing commercial module design. The ADDAC 300 tapped directly into that ethos, offering a safe, non-destructive way to apply one of the most fundamental bending techniques—power starvation—without modifying a single circuit. It wasn’t the first module to experiment with alternative power manipulation, but it was among the first to make it accessible, reliable, and musically useful. In a world where digital perfection was becoming the norm, the ADDAC 300 celebrated failure, offering a way to inject entropy into even the most tightly controlled patches.

Collectibility & Value

The ADDAC 300 has settled into a stable niche in the used market, typically selling between €60 and €90 depending on condition and region. It’s not a rare module, but it’s not disposable either—its unique function ensures steady demand among experimental modular users. Because it doesn’t process audio directly, there’s little wear on the panel or jacks, and the internal circuit is simple and robust. Failures are uncommon, though the IDC connectors on the back should be inspected for bent pins, especially if the module has been frequently removed from a bus board. The most common issue is misconfiguration—users accidentally starving modules that draw more than 75 mA per rail, which can lead to instability or damage. The ADDAC300A variant is rated for up to 75 mA, but exceeding that is not advised. When buying used, ensure the bypass switches click cleanly and that the pots turn smoothly without crackling. No recalibration or maintenance is typically needed, making it a low-risk acquisition. For anyone exploring circuit-bent textures or lo-fi modular aesthetics, it remains a cost-effective gateway into voltage manipulation—one of those modules that punches far above its size and price.

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