ADDAC107 ACID SOURCE USER’S GUIDE
April.2023Revision.01
Welcome to:
page 2ADDAC SYSTEM
DESCRIPTION
We started this module with the idea of developing a
complex drum source however, somewhere along the
process, we noticed how much better it performed as a
synth voice and simply embraced this lucky accident.
It features a VCO with a [FREQUENCY] and [FINE TUNE]
knob plus a dedicated CV Input and Attenuator knob
(tunable over 4 octaves).
The VCO waveform output is achieved by selecting either
a Triangle or Saw through a switch.
the selected waveform can then be mixed/balanced
against the square wave.
The resulting mix is then sent to the Filter.
The Filter features a [CUTOFF] and [RESO] resonance
knob plus a Cutoff CV Input and Attenuverter knob.
A 3 position switch is used to select the filter type:
Highpass, Bandpass or Lowpass.
The resulting output is then sent to the VCA.
The VCA features an Input with [INPUT GAIN] knob which
at maximum can amplify the incoming signal by a factor
of 2. This is a very important control (more about it in the
next page). It accepts any signal Trigger, Gate or CV.
Whatever input is plugged in the signal is then fed
through an AD with a very short attack and controllable
decay through the [VCA DECAY] knob plus the CV Input
and Attenuverter knob.
The resulting slewed signal is then used to control the
VCA gain. This signal is also sent to the CV OUTPUT as
well as the LED monitor.
The Accent input adds to the Input signal creating a
different amplitude output
The CV OUTPUT is also normalled to the Frequency and
Cutoff inputs.
This module will also be available as a full DIY kit. Tech Specs:
9HP
4 cm deep
80mA +12V
80mA -12V