ADDAC 812A (Years Unknown)
Eleven pairs of glowing eyes watching your volts - simple, trimmable, and built to feed both your ears and your eyes.
Overview
The ADDAC 812A is a dual-channel LED audio meter for Eurorack. It isn't a synth voice or an oscillator. It just watches voltage and shows it to you. ADDAC System lists it in their legacy lineup, part of a small range of metering tools. It's not flashy in function, but it earns its place on the panel by being useful, and it looks damn good doing it.
Owners report a soft spot for gear with visual feedback, and the 812A fits that. Each channel has eleven pairs of LEDs. One user put it plainly: "if something has VU meters on I instantly like it and I want to buy it." The job is technically passive, but the meter isn't dumb glass. It's volt-dependent, it compares accurate voltages, and it gives you buffered thru outputs so you can pass signals along without loading down your sources.
It's part of a small family with the ADDAC 812V, 812VU, and 200A. Unlike some meters that just sit and blink, the 812A lets you trim the LED response, so you can calibrate it to match your system's idea of "hot."
Specifications
| Manufacturer | ADDAC System |
| Product type | Eurorack module, Dual LED audio meter |
| Input range | 0 V to +10 V |
| Number of LED indicators | 11 pairs of LED |
| LED indication levels | Green lights go up to 5V, yellow almost reach 10V and 10V is red, indicating peaking. |
| Outputs | Buffered thru outputs for each channel |
| Module depth | 40mm |
| Features | Voltage LED meters are trimmable |
Key Features
Visual Voltage Monitoring with Color-Coded Feedback
The front panel is simple: eleven pairs of LEDs per channel, giving an immediate read on signal level. The colors follow a plan. Green runs up to 5V. Yellow takes over as levels climb, warning you that red is near. At +10V, red lights up and flags peak levels. That helps catch clipping in a modular, where overages get gnarly fast. It isn't a VU in the analog electromechanical sense, but it uses the same visual language. Owners note the "retro VU look" and call the modules "ace" and "sexy."
Trimming for Precision
One of the quiet strengths of the 812A is that its LED response is trimmable. That means you’re not stuck with factory calibration—if your system runs a little hot or you want to fine-tune the transition points between green, yellow, and red, you can. This is especially useful in modular, where different modules output at slightly different voltages, and “unity” isn’t always a universal standard. Being able to align the meter with your personal workflow turns it from a passive display into an active tool.
Buffered Thru Outputs
Each channel has a buffered thru output. Many meters simply take a signal and display it, which can load the source or make daisy-chaining awkward. The 812A buffers the pass-through, so you can patch into it without worrying about impedance issues or signal degradation.
Volt-Dependent Design
The 812A is volt-dependent. It responds directly to the voltage present at its inputs. It isn't a peak-hold or RMS-averaged display, but a real-time reflection of the actual signal level. ADDAC System notes that "accurate voltages are being compared," which suggests internal circuitry designed for fidelity, not approximation.
Collectibility & Value
The ADDAC 812A is no longer available. According to Schneidersladen it has been archived, and as of August 2021 one user reported being unable to find it anywhere. Another suggested checking Analogue Haven, noting they might have had stock at the time. The fact sheet lists no current market prices, and there are no reports of common failures or maintenance issues. As a legacy module, it's likely only available used, if at all. Owners praise its "retro VU look" and call it "the business." Without original pricing, production years, or failure data, its collectibility comes down to scarcity and taste rather than hard metrics.
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