ADDAC220

This is our new Stereo Envelope Follower, an analog/digital hybrid for better dynamic range analysis. The incoming audio signal gain can be set with the [GAIN] control, the signal is then fully rectified and passed through an analog envelope follower with a fixed short attack and decay.

This analog signal is then sent into a 12bit ADC (analog to digital converter) of an MCU (microcontroller unit) from here on the signal is processed digitally. Whenever the ADC detects clipping the [CLIP] led will turn On.

The digitized signal is then passed through a Savitsky-Golay filter for noise reduction smoothing the incoming signal. Next the signal is slewed using the [ATTACK] and [DECAY] controls. The MCU keeps a history of the last sampling points and detects the minimum and maximum values of the signal which reflect the current dynamic range and maps the signal minimum and maximum amplitude to 0V and the maximum voltage detected. Avoiding the discharge of the analog envelope capacitor.

This new mapped signal is then processed via the [RESPONSE CURVE] control balacing the response like one would with a standard AD envelope with LOG/EXP control. The [ENV. GAIN] attenuverter control goes up to x2 amplification and sets the attenuation / amplification factor of the output range, the red led monitors this level. The led uses pwm control for faster response and better visualization of the output signal across the full output range.

Finally the [OFFSET] allows to displace the signal’s voltage up or down.

The [THRESHOLD] control sets the level to compare to the output signal and turns the [GATE] output On when the signal is above the threshold.
The [GATE LED] show the output state.
The [CV OUT] carries the Envelope signal (0 to +10V) while the [INV. CV] Output carries an inversion of the signal (-10V to 0v).
The [AVG. OUT] outputs the average of both Left and Right CVs (0 to +10V) while the [INV. AVG.] outputs the inverted average signal (-10V to 0v).
The [STEREO / DUAL MONO] switch allows to use the left channel controls to operate the right channel for stereo operation or keep them independent in dual mono. In Stereo mode only the Right channel gain will be independent.

Left input is normalled to the Right input. 

Tech Specs:
10HP
4.5cm deep
70mA +12V
40mA -12V

Note: All specifications and features are subject to change without previous notice.

Product Safety Information

Eurorack Module

Important Safety Information
This Eurorack module is designed for use within standard Eurorack synthesizer systems and is intended for adult users familiar with modular synthesis and electronic equipment.

Please read this safety guide before installation or use.

General Warnings
1. Electrical Hazards:
• Ensure the power supply matches the module’s specified voltage and current ratings (refer to the product manual). Incorrect voltage can damage the module and pose a safety risk.
• Never connect or disconnect the module while the Eurorack system is powered on.
2. Heat Generation:
• The module may generate heat during operation. Ensure proper ventilation within your Eurorack case to prevent overheating.
3. Sharp Edges:
• The module’s faceplate and components may have sharp edges. Handle with care to avoid cuts or scratches.
4. Small Parts:
• Contains small parts that could pose a choking hazard. Keep away from children and pets.
5. Compatibility:
• This module is designed specifically for Eurorack-compatible systems. Connecting it to non-compatible systems may result in damage or malfunction.

Installation and Use
• Mounting: Secure the module properly in the Eurorack case using the provided screws.
• Power Connection: Verify the polarity of the power cable before connecting to avoid damage to the module or power supply. Use only the included or manufacturer-recommended power cable.
• Operational Use: Follow the module's user guide for instructions on operation. Do not exceed the input/output limits specified.
Maintenance and Handling
• Inspection: Regularly check for loose connections or signs of wear.
• Cleaning: Disconnect the module from power before cleaning. Use a dry or lightly damp cloth; avoid using solvents or water directly on the module.
• Repairs: Do not attempt to repair or modify the module yourself. Contact the manufacturer for support.

Environmental Safety
• Dispose of the module, its components, and packaging in accordance with local electronic waste regulations.

Liability Disclaimer
• The manufacturer is not responsible for any injury, damage, or malfunction resulting from improper installation, use, or modification of this product.

Contact Information

For further assistance, contact our support team at:
Addacsystem, Lda.
addac[at]addacsystem[dot]com