ADDAC 300A (2022–)

A tiny voltage saboteur that lets you starve your modules into glitchy, unstable, beautifully broken sonic territory—like a controlled power failure with knobs on.

Overview

It’s not often you find a module designed to make other modules fail—but that’s exactly what the ADDAC 300A does, and it does it with surgical precision. This isn’t about blowing things up (though you should still proceed with caution); it’s about nudging your gear to the edge of collapse, where the most interesting artifacts live. The 300A is part of ADDAC’s 300 Series, a line focused on power manipulation and circuit-level mischief, and it’s built for the Eurorack experimenter who’s already tried every filter, every LFO, every modulation source, and is now asking: “What if I just… underfed this thing?”

At its core, the 300A is a dual power starvation module—meaning it lets you independently reduce the positive and negative voltage rails going to two separate Eurorack modules. You plug your target module into the 300A via IDC cables (standard Doepfer-style), and then use the front-panel potentiometers to dial down the voltage it receives. Most analog modules expect ±12V or ±15V, but when you start dropping that down to ±5V or lower, strange things happen: filters warp unpredictably, oscillators sputter and fold back, delays glitch and stutter, mixers distort in organic, non-linear ways. It’s like putting your synth on a hunger strike and seeing what it hallucinates.

ADDAC didn’t just slap together a voltage dropper—they engineered it with care. The 300A includes trimmers on the back to set a minimum voltage plateau, so you’re not accidentally dropping to 0V and killing your module. That’s crucial, because while some circuits can tolerate deep voltage reduction, others will shut down or behave erratically below certain thresholds (usually between 3V and 10V, depending on design). The trimmers let you define a safe floor, then use the front pots to sweep through the usable range. There’s also a bypass switch for each channel, so you can A/B the effect instantly. Build quality is solid—clean silkscreen, sturdy knobs, and a compact 4 HP width that won’t eat your rack real estate.

And yes, it’s risky. Power starvation isn’t a “set and forget” effect. It can stress components, especially in modules not designed for it. The 300A is explicitly not recommended for modules drawing more than 75mA per rail, and ADDAC warns users to proceed at their own risk. But that’s part of the charm: this is gear for tinkerers, not tourists. If you’ve ever bent a circuit or modded a pedal, you already speak its language.

Specifications

Key Features

Controlled Voltage Collapse

The genius of the 300A isn’t just that it lowers voltage—it’s that it lets you do it with control. Most power starvation hacks involve physical mods, resistors, or risky jumper wires. The 300A brings it into the modular workflow: patchable, reversible, and repeatable. You can set a sweet spot where your analog delay starts to warble but doesn’t drop out, or where a filter oscillates in a new, unstable way. Because the effect is applied at the power level, it interacts with every part of the circuit—not just the audio path. That means you’re not just distorting the sound; you’re altering the module’s behavior at a fundamental level. An LFO might slow down erratically, a VCA might gate unpredictably, a sequencer might skip steps. It’s chaos with a volume knob.

Dual Independent Channels

Having two channels means you can experiment with different voltage profiles on two modules at once. Maybe you want to gently starve a filter while completely crippling a reverb. Or run two oscillators at different voltages to create beating, detuned textures that shift over time. The channels are completely independent—each with its own bypass and voltage control—so you’re not locked into matching treatments. And because the module draws only 20 mA from the bus, it’s not a power hog itself, leaving headroom for the modules it’s feeding (or starving).

Trimmer-Set Floor for Safety

One of the smartest design choices is the inclusion of rear-mounted trimmers to set a minimum voltage. This prevents the front-panel pots from going too low and potentially damaging sensitive circuits. You can calibrate each channel to cut off before reaching dangerous levels—say, 4V or 5V—then use the knobs to sweep from that floor up to full voltage. It’s a safety net that doesn’t sacrifice experimentation. That said, it’s still on the user to know their modules. Some digital modules, for example, will hard-reset or lock up if voltage drops too far. The 300A works best with analog circuits—filters, oscillators, VCAs, mixers—where voltage fluctuations create musically useful artifacts rather than system crashes.

Historical Context

Power starvation as a sonic technique predates modular synthesis—it’s a staple of circuit bending, where DIY enthusiasts manipulate low-voltage devices like kids’ toys or drum machines by underpowering them to create glitchy, unpredictable sounds. The practice became popular in the 1990s and 2000s among noise and experimental musicians, but it was always a physical hack, not a patchable effect. ADDAC’s 300 Series brought that ethos into Eurorack, making it accessible without soldering irons or multimeters. The 300A, along with its sibling the 300 (which covers higher-current modules), was part of a wave of modules focused on power manipulation—not just clean distribution, but creative corruption. In an ecosystem where pristine digital modules and high-fidelity converters dominate, the 300A is a deliberate step into the messy, unstable, human side of electronics. It’s not about accuracy; it’s about character.

ADDAC System, based in Lisbon, has built a reputation for modules that bridge vintage inspiration with modern utility. The 300A fits that philosophy: it’s not emulating a classic piece of gear, but it taps into the same spirit of hands-on experimentation that defined early synth culture. While competitors focused on digital effects or complex sequencers, ADDAC doubled down on the physicality of sound—modules that interact with power, light, and touch in unpredictable ways. The 300A is a niche product, but for those who get it, it’s indispensable.

Collectibility & Value

The ADDAC 300A isn’t a collector’s item in the traditional sense—it’s too new, too utilitarian, and too specialized. But it has carved out a loyal following among experimental modular users, and used units hold their value well. New, it retails for around €70, and used examples typically sell for €50–€65 depending on condition and market availability. It’s not a rare module, but it’s not mass-market either; production is steady but limited, and it doesn’t flood the used market like more mainstream modules.

Failures are uncommon, but the most critical thing to check when buying used is the integrity of the IDC connectors on the back. These are the points where your modules physically plug in, and repeated insertion/removal can wear them out or loosen solder joints. A wobbly connection here could mean intermittent power or, worse, shorting. Also verify that the trimmers are functional—some users leave them set and forget, but if they’re seized or damaged, you lose the safety floor feature. The module has no moving parts besides the pots and switches, so mechanical wear is minimal. No firmware, no software, no hidden traps—just pure analog control.

If you’re buying one, consider why you want it. It’s not a daily-driver effect. It’s a color tool, a glitch source, a way to break your rig in creative ways. It pairs especially well with analog delays, resonant filters, and chaotic sequencers. But if your system is mostly digital or you’re after clean, polished sounds, the 300A might sit unused. It’s for the tinkerer, the sound designer, the noise artist. And if that’s you, it’s worth every euro.

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