ADDAC System ADDAC200P (2023–)
A tiny power monitor with no frills. It goes in every Eurorack build.
Overview
You don't notice it until something goes wrong. The ADDAC200P doesn't make sound and won't inspire a patch. It sits in a 2HP space and watches your ±12V rails, so you can see right away whether your power supply is doing its job. It's not a regulator, a filter or a conditioner. It's a passive monitor that plugs into your bus board and lights up. Eurorack builds can cost thousands, and troubleshooting a dead row means digging through cables and multimeters. This module is always on and always showing you the rails.
ADDAC System is based in Lisbon and has built a reputation for musician-first design across its modular lineup. The ADDAC200P is functional, reliable and unobtrusive. It has no adjustable thresholds, no current draw readout and no MIDI. It shows you, at a glance, whether your +12V and -12V are present. That's all it does. A single loose cable or failing power supply can bring a whole system down, so the simplicity is a feature. You install it once and forget it, until one of those LEDs flickers and you catch a problem before it takes down your setup.
Specifications
| Manufacturer | ADDAC System |
| Production Years | 2023– |
| Original Price | 40.00 € |
| Format | Eurorack |
| Width | 2 HP |
| Depth | 2 cm |
| Power Supply Compatibility | ±12V, ±15V |
| Max Current Draw | 10mA |
| Power Connector | 8×2 IDC (Doepfer style) |
| Function | Power supply monitoring with LED indicators |
| LED Indicators | ±12V status LEDs on front panel |
| Weight | Not specified |
| Series | ADDAC200 Series – Analog CV Utilities |
Key Features
Instant Power Status at a Glance
The front panel has two small, bright LEDs: one for +12V, one for -12V. When both are lit, your power rails are live. No probing with a multimeter, no power cycling to check connections. That helps in complex or densely packed racks, where a single loose cable might starve a row of modules. It gives immediate feedback during setup or troubleshooting. It seems trivial until you've spent 20 minutes chasing a dead module only to find a flipped power cable.
Minimal Footprint, Maximum Utility
At just 2HP wide, the ADDAC200P is one of the most space-efficient diagnostic tools in Eurorack. It doesn't compete with voice modules, filters or effects for panel space. It tucks into a corner of your case, maybe next to your power supply distribution board. Its shallow depth (2 cm) also suits skiff builds and travel cases where space is tight. Giving up 2HP for system visibility is an easy call.
Built for Compatibility
The module works with both ±12V and ±15V power systems, so it adapts to different cases and power supplies. It draws a negligible 10mA, so it won't burden even a tightly budgeted power setup. It uses a standard 8×2 IDC Doepfer-style ribbon cable, which fits the vast majority of Eurorack cases and bus boards. There are no trimpots, no switches and no calibration. You plug it in and go. Beginners and experienced modular users who've learned the hard way how easily power issues can derail a session both favor it.
Historical Context
The ADDAC200P arrived in 2023 as part of ADDAC System's ongoing expansion of its utility modules. Most manufacturers focus on sound-generating or performance modules, and ADDAC has built a reputation for filling the gaps with tools that make modular synthesis more reliable, expressive and user-friendly. The 200 Series, labeled "Analog CV Utilities," includes clock dividers, logic processors and signal monitors, all designed to support the creative workflow rather than dominate it.
Eurorack has matured from a niche hobbyist format into a staple of professional studios and live rigs, and demand for reliable infrastructure has grown. The ADDAC200P is a practical tool for system maintenance, not a novelty or a boutique sound designer's toy. It joins a lineage of unglamorous gear like patch cable testers, power supply meters and grounding tools, which only become important when they're missing.
Collectibility & Value
The ADDAC200P isn't a collector's item in the traditional sense. There's no limited run, no special edition, no vintage mystique. It's currently in production and priced at 40.00 € (excluding VAT). On the secondhand market it rarely trades far from its original price, and listings are sparse because most owners don't sell it. When units do appear, they typically go for 30-50 € depending on region and condition.
There are no known failure points. With no active circuitry beyond basic LED drivers and voltage detection, the ADDAC200P is about as reliable as a Eurorack module can be. The most common "issue" reported is cosmetic: minor scratches or scuffs from installation, which don't affect performance. Buyers should verify that the LEDs illuminate when powered and that the IDC connector seats fully on the bus board. Beyond that, there's little to go wrong. For anyone building or repairing a rack, it's less a purchase and more a standard upgrade, like adding a surge protector to a pedalboard.
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