Owner manual

Page 4 of 4

HARDWARE: Controls (Left): AUDIO INPUT (+/-50% Gain/Attenuation)

CUTOFF FREQUENCY (Manual)

FREQUENCY CV (External)

Controls (Right): FEEDBACK INPUT (+/-50% Gain/Attenuation)

RESONANCE LEVEL (Manual)

RESONANCE CV (External)

Inputs (Audio): 2x AC, approx. +/-10V max. (3.5mm)

Inputs (CV): 3x AC/DC, approx. +/-10V max. (3.5mm)

(1x scaled to 1V OCT for Frequency Cutoff)

Outputs (Signal): 4x AC: Low, High, Band and All-Pass (3.5mm)

Power Requirements: +/-12V via 16-pin, Doepfer-style IDC connector

Current Draw: 90mA average

Dimensions: 10HP (W); panel to IDC connector 35mm (D)

Supplied Accessories: 1x 16-pin, Doepfer-style cable, 4x M3 screws

CALIBRATION:

Each ADE-20 is calibrated before shipping to provide the best balance

between sound and performance. This includes maximizing the range

of self-oscillation, getting the best sine wave shape and ensuring the

filter responds quickly to changes in Resonance at low frequencies.

Because the ADE-20 uses ‘discrete’ OTAs (Operational Transconductance

Amplifier) there are some performance characteristics that set it apart from

other filters.

Firstly, the 1V OCT tracking is limited to about 1 octave.

This can be fine-tuned or re-calibrated by the user.

(Please see ‘1V OCT CALIBRATION’ on page 3 of this guide)

Secondly, under certain settings, there may be a small amount of ‘bleed’

from the CV Inputs appearing at the Filter Outputs. This is generally only

noticeable when modulating the Cutoff Frequency at audio rates with high

Resonance levels and low Audio Input levels (or no Audio Input). This is

a common trait of discrete OTA designs and most users believe that this

benefits the overall character and sound of the filter.

For more advice on calibrating the ADE-20 please contact Abstract Data.

PRECAUTIONS: The ADE-20 uses the Doepfer standard for power connection and cable

orientation. The RED stripe on the supplied power cable connects to the

NEGATIVE (-12V) rail on the ADE-20 with the RED stripe facing DOWN.

This is marked on the back of the ADE-20 PCB as “-12 RED”.

(Please see ‘POWER CONNECTOR’ on page 3 of this guide)

The ADE-20 has diode and polyfuse protection built in but an incorrectly

connected cable may still cause damage to the module or the power supply.

The rear panel of the ADE-20 has exposed parts and connections. Please

ensure when handling the ADE-20 that the unit is held by the sides of the

front panel or the sides of the PCB.

CREDITS: Rory Dow

Ryan Sarver

Tom Wiltshire

3: Technical