This is the product details for the ADDAC126 Rotary Exciter, part of ADDAC System's ADDAC120s Four Strings series, available at Takazudo Modular.
The ADDAC126 Rotary Exciter is a 10HP module in which a 7000RPM brushless motor spins four magnets, exciting strings via the resulting rotating magnetic field. When the motor's rotation speed matches a string's resonant frequency (or one of its harmonics), the string begins to vibrate.
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Takazudo Modular publishes manuals and related documents with Japanese translations. See the links below.
- Product Photos
- Overview
- SPEED Control and CV Input
- Specifications
- Development Background
- ADDAC120s Four Strings Series
Product Photos
Overview
The ADDAC126 Rotary Exciter is a module that uses a rotating magnetic field to excite strings. The rotating disc on the panel holds four magnets with alternating polarity, which a 7000RPM brushless motor spins.
The magnetic field generated by this rotation acts on the strings (metal strings) of the ADDAC120s Four Strings series. When the motor's rotation speed matches either the fundamental or a harmonic of a string, that string resonates and begins to vibrate. This is similar to the effect of bowing an electric guitar to produce a sustained sound.
SPEED Control and CV Input
The disc's rotation speed can be adjusted manually with the SPEED knob on the panel. In addition, by feeding CV into the CV INPUT jack, you can also voltage control the rotation speed.
The rotation speed control is designed to be non-linear, making it easier to find the points where the strings resonate as you operate the CV or the knob. By sending an envelope, LFO, or similar to the CV input, you can also vary how the excitation is applied over time.
Specifications
Width: 10HP
Power consumption: 100mA +12V
7000RPM brushless motor + 4 magnets (alternating polarity)
Controls: SPEED knob, CV input (non-linear)
Development Background
The ADDAC126 Rotary Exciter was developed as part of the ADDAC120s Four Strings series, which uses physical strings as its sound source. The series is built around the concept of engaging with the material of the string through a variety of approaches to produce sound.
Within that series, the ADDAC126 takes on the role of sounding the strings using nothing but the force of a magnetic field, without ever touching the strings directly. Whereas a plectrum physically plucks a string, this unit continuously excites the strings with a rotating magnetic field, offering an approach well suited to sound design with drones and sustain.
ADDAC120s Four Strings Series
The Four Strings series is available both as individual modules and as bundle systems. Our shop carries only the frameless ADDAC120BS Strings Basic System. If you'd like a larger setup, please consider adding other modules from the series separately.
Modules / Frames
A matched pair of Headstock (17HP) and Bridge (6HP) panels with 4 locking tuners for easy string installation. Passive stainless-steel construction raises strings high enough to fit other modules underneath. Includes a string set (.010–.046), bow arch attachment, and small resonators.
A 10HP humbucker pickup module with an integrated pre-amplifier delivering synth-level output. Features TONE and VOLUME knobs plus a LOW/HIGH gain switch. Height-adjustable via mounting screws; the pickup can be removed for handheld use.
A 14HP quadraphonic pickup with 4 independent coils — one per string — each with its own pre-amplifier, VOLUME knob, and output jack (STRING 1–4), plus a MONO MIX output. All coils are hand-wound with Alnico 5 slugs, 44AWG polyurethane wire, and ~7.4kΩ per coil.
A 14HP plectrum module with one servo per string, triggerable via push-button, gate, or MIDI (USB + TRS). Offers Pluck mode (~20° swing to pluck the string) and Harmonic mode (~10° tap for harmonics). Up to 3 units can be daisy-chained.
A 10HP servo-driven mute module inspired by the Fender Mute (Jaguar/Bass VI). A foam pad lowers onto the strings to create a gentle dampening — a distinct tonal character different from palm muting. Passive module; controlled by an ADDAC124 Plectrums servo.
A 10HP module with a 7,000 RPM brushless motor spinning 4 magnets. When the motor RPM matches a string's resonant frequency or harmonics, the rotating magnetic field excites the string — similar to using a bow on an electric guitar. Speed is controlled by a SPEED knob and CV input.
A 16HP mechanical harness and sliding rail for a standard Ebow. The included Ebow is modified with the "PianoBow" mod (feet sanded down) so it slides freely below all strings without contact. Height is adjustable via thumb screws. Passive module; no power required.
Four Strings Systems (Bundles)
Bundle pricing works out cheaper than buying the modules individually. Since the modules included in a bundle are essentially required to produce sound, we recommend starting from a bundle and adding other modules to it.
| Product | Set price (incl. tax) | Total of unit prices (incl. tax) | Bundle discount |
|---|---|---|---|
| ADDAC120BS Strings Basic System | ¥80,800 | ¥84,400 | -¥3,600 |
About ADDAC System
ADDAC System is a modular synthesizer maker based in Portugal.
Their lineup is built on solid, no-nonsense modules that make the most of analog character. At the same time, they have released plenty of inventive modules that bring digital technology into the mix in a tasteful way — flexible CV-to-MIDI converters, deeply controllable granular processors, and more.
That concludes the introduction to the ADDAC126 Rotary Exciter.
By exciting strings with a rotating magnetic field to produce bowed-instrument-like sustained tones, this unit is a module for giving the strings of the ADDAC120s Four Strings series a sustained sound.
We hope you found this helpful.
Register your email and we'll let you know when it's back in stock.
We're accepting advance reservations. After we confirm your registration, we'll email you the details.
Takazudo Modular publishes manuals and related documents with Japanese translations. See the links below.