ADDAC900B +5V

• Low Impedance Bus Board with built in +5V Adapter

• 19 Standard (2x8 pins) Boxed Headers Connectors

• Compatible with all Eurorack Modules

This busboard works with the ADDAC901PDN Power Delay modules, which we also have available.

This is a Do-It-Yourself kit, not an assembled module. Relatively easy, not even building insctructions needed and there exists none. Just basic DIY knowledge is important.

DIY level: easy. Suitable for beginners, but you have to solder some (quite big) SMD parts! But most parts are through hole.

This small board was designed to bring some extra flexibility and customization regarding powering up a modular system.
Whenever a modular system is turned on there's a current spike upon startup that will momentarily influence the PSU output and can take up to a couple seconds for the PSU to stabilize to it's stated specifications. PSUs can also have some delay between their power lines where one polarity is provided prior to the second one. They also commonly have a ramp like startup. All this is common and normally not a problem. While most modules are fine with this situation, there are others that can suffer from this and in a worst case scenario won't startup correctly. Some modules can also be sensitive to the timing of the ±12v, some may require both to arrive at the same time others won't start if -12v arrives prior to the +12v, etc.

This small board allows to time the deployment of power to a specific module, it can delay each power line independently by 3 seconds, meaning that after powering up your modular it will wait for 3 seconds until it will provide power to the specific module connected to it. This delay time can also be customized by the user replacing a couple capacitors.
Using this small board with more sensitive modules allow them to power up at a time past the initial spike and where the PSU is already stable and it will guarantee that the ±12V is delivered at exactly the same time.

Besides this very technical use there are other creative and useful uses, for example plug it to those specific modules that "drive" your patch, like a sequencer or a clock and have them power up later so that other modules have time to start up and stabilize before starting up the clock. Go even deeper in this idea and have diferent 900PDs with diferent capacitors that will allow you to "program" a sequential module power up, usefull for generative patches that run on a power timer in exhibitions and galleries.

One more useful hack is to use it in those cases where your frame won't power up due to the initial current "spike", making it going over it's limits and trip the protection mechanism failing to startup. The usual "hack" is to unplug one or two modules allowing it to power up and then connect the extra modules in. ***Warning***  power up issues like these simply means your PSU is close to it's maximum and the PCB shouldn't be used as a permanent fix and we advise upgrading the PSU. However it will make it easier in that situation where you add one last minute module for that gig in a few hours and that extra module trips the PSU protection, then as a temporary hack the PCB will make it easier for the frame to power up at the gig.

There are 2 sets of jumpers to independently set the power line to be delayed, -12V, +12V or both.
This PCB will be plugged onto your busboard and, in turn, allow a ribbon power cable to be connected to it.

There are 2 models ADDAC901PDO for Old style Busboards and ADDAC901PDN for New style Busboards. They work with Addac and many other busboards, but make sure you chose the version which fits to the busboard you have. See the pictures and use the drop down menu to get the correct one!

DISCLAIMER: Both the ADDAC901PDO and the ADDAC901PDN are not to be used with modules that require external +5V supply.

This is a Do-It-Yourself kit, not an assembled module. Relatively easy, not even building insctructions needed and there exists none. Just basic DIY knowledge is important.

DIY level: easy. Suitable for beginners, all SMD parts pre-soldered!

Another addition to our ADDAC300’s Expressive Controls series. This module converts the incoming light hitting an external light sensor into 2 Bipolar CV Streams:
Output: More light > Higher CV output
Inverted Output: More light > Lower CV output

The external sensor is enclosed in a jack socket in order to be used with any standard jack cable and be able to place it in any place outside the Eurorack frame.

There are several controls to adjust the CV Output’s signals:
• Sensitivity: Adjusts the Light Sensor sensitivity to Light. The Higher the sensitivity the better it responds to low light situations.
• Response: 3 fixed settings (medium/fast/slow) to set the slew applied to the raw signal coming from the sensor.
• Gain: Sets the gain for both outputs
• Offset: Adjusts the Offset for the main Output.
• Inverted Offset: Adjusts the Offset for the Inverted Output.

Power: 50 mA @+12V; 50 mA @-12V

Width: 4 HP

Depth: 45 mm

Panel: black alu

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. SMD parts are pre-soldered, THT parts and possibly bigger SMD parts to be soldered.

Another addition to ADDAC200’s CV Utilities. This module features 3 independent Attenuverters each with its input, output and 13mm knob. White areas allow the user to write down what is connected to each channel.Channel 1 is normalled to Channels 2 and 3.

Power: 40 mA @+12V; 40 mA @-12V

Width: 4 HP

Depth: 25 mm

Panel: black alu

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. SMD parts are pre-soldered, THT parts and possibly bigger SMD parts to be soldered.

The TILT EQ concept was first introduced in the 1970's by Quad Ltd, featured on the company’s model 34 preamplifier. The tilt control tilts the frequency spectrum of the audio signal by simultaneously boosting the treble and cutting the bass frequencies, or vice versa, making it a simple to use but powerful EQ.

As stated by Quad Ltd, it was designed to produce a very gradual change in balance across the musical spectrum without changing the overall subjective level. This gradual fall from Bass to Treble, or vice versa, means there’s no sudden change and hence no ‘coloration’ added to the sound, the sound will remain entirely natural but with a slight added bottom or high end. In practice, it rotates most of the audio-range frequency response around a 1kHz axis, so as to change the overall balance of the sound from warm to cool without affecting either the apparent volume or the "color" of the sound.

Here we introduce this idea into the modular world in a stereo configuration. CV input with attenuverter was added for the Tilt control as well as a Spectral Motion switch that allows stereo spectral matching or inverted spectrum use of the Tilt control: Left = Right matches both channels direction, i.e. when left channel is tilted to the low end the right channel will also be tilted to the low end. Left ≠ Right inverts the Right channel spectrum, i.e. when left channel is tilted to the low end the right channel will be inversally tilted to the high end, or vice-versa. This possibility is extremely interesting when applied as a stereo effect, in other words, a spectral EQ panner.

Power: 40 mA @+12V; 40 mA @-12V

Width: 4 HP

Depth: 45 mm

Panel: black alu

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. SMD parts are pre-soldered, THT parts and possibly bigger SMD parts to be soldered.

ADDAC710 is a dual channel Isolated DI box and is all about keeping the sound coming from your Modular free from any undesired noisy interferences, making sure that what you’re getting from your outputs is what your Modular is actually producing. It provides galvanic electrical isolation between the Modular system and external sources preventing impedance mismatch and ground loop induced hum.

ADDAC’s 710 circuit is designed around a unity 1:1 type Audio Transformer operating in the 20 Hz to 20 KHz range, this impedance matching transformer provides two fully balanced outputs (via XLR connectors).

ADDAC710 is an alternative to our ADDAC800X High-End Outputs module, we redesigned the original circuit using a smaller transformer that also reduced it’s depth allowing it to fit shallow Eurorack cases.

The LIFT/FLOAT/GND 3-way switch lets you choose between lift, ground or floating ground.
In the LIFT position (left) the module circuit will be “lifted” to ground through a 100R resistor and a 10nF capacitor.
In the FLOAT position (middle) Ground will not be shared leaving ins and outs grounds completely apart from each other fully isolating both signals.
in the GND position (right) Ground will be shared between inputs and outputs, here no isolation is used.

Any of these three positions may be the best form of avoiding ground loops or any other undesired interference occurring between your modular and the sound system you’re plugging it into. Try out which one of these options will work best in any given situation.

Power: 40 mA @+12V; 40 mA @-12V

Width: 6 HP

Depth: 40 mm

Panel: black alu

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: medium. SMD parts are pre-soldered, THT parts and possibly bigger SMD parts to be soldered.

ADDAC711 is a dual channel Isolated DI box and is all about keeping the sound coming into your Modular free from any undesired noisy interferences, making sure that what you’re getting from your inputs is what your external hardware is actually producing. It provides galvanic electrical isolation between the Modular system and external sources preventing impedance mismatch and ground loop induced hum.

ADDAC’s 711 circuit is designed around a unity 1:1 type Audio Transformer operating in the 20 Hz to 20 KHz range, this impedance matching transformer provides two fully balanced outputs (via XLR connectors).

The LIFT/FLOAT/GND 3-way switch lets you choose between lift, ground or floating ground.
In the LIFT position (left) the module circuit will be “lifted” to ground through a 100R resistor and a 10nF capacitor.
In the FLOAT position (middle) Ground will not be shared leaving ins and outs grounds completely apart from each other fully isolating both signals.
in the GND position (right) Ground will be shared between inputs and outputs, here no isolation is used.

Any of these three positions may be the best form of avoiding ground loops or any other undesired interference occurring between your modular and the external hard- ware. Try out which one of these options will work best in any given situation.

Power: 40 mA @+12V; 40 mA @-12V

Width: 6 HP

Depth: 40 mm

Panel: black alu

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: medium. SMD parts are pre-soldered, THT parts and possibly bigger SMD parts to be soldered.

ADDAC713 is the stereo version of our 703 Discrete Mixer. Inspired by Moog’s CP3 mixer, this is a fully discrete analog mixer and it's not, by any means, your standard breakfast mixer, although it can behave like one.

This is a wolf in sheep's clothing. Despite its harmless looks there's a dark snarly soul behind that panel that wants to take your sounds into a realm of gritty gnarly growls.

This new version was initially thought of as a percussion mixer, with mono inputs and panning, to allow placing percussive voices in the stereo field, while keeping channel 4 in mono for low end sources like a kick drum or Bass. In the development process we slightly changed this initial idea, adding stereo inputs for the first 3 channels, but still kept the 4th channel in mono.

All four [GAIN] controls go to extreme levels, the first 3 channels also feature [PAN] controls.

Feedback is used to overdrive the whole mix. As the control is turned clockwise the sound will be clipped harder until it goes completely off, this happens as feedback is increased the audio bias reference also moves up, at extreme levels it offsets the whole signal upwards until it completely goes above the top rail clipping the whole signal hence the resulting gate effect.

The [MASTER OUTPUT] sets the overall output gain of the mixer, the two LEDs monitor the audio output signal.

The soft clipping switch engages an anti-click circuit which adds a low pass before the output, the switch allows 3 states: Soft low pass / Off / Hard low pass

Features
• Three channels with stereo inputs, gain and pan knob
• One channel with mono input and gain knob
• Feedback/gate knob
• Master output volume knob
• Soft clipping switch
• Two LED monitors for left and right channels

Power: 80 mA @+12V; 80 mA @-12V

Width: 8 HP

Depth: 40 mm

Panel: black alu

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: medium. SMD parts are pre-soldered, THT parts and possibly bigger SMD parts to be soldered.

ADDAC712 is a dual channel discrete gain staging amplifier, based on a famous discrete preamp board from the 70’s used in some legendary equipment. What caught our attention was the character of it’s clipping and resulting saturation/distortion.

The module can be used with modular signals to add a distortion/fuzz character or as a preamp for an external source such as a line source, keyboard, guitar... It’s also a great side companion for our ADDAC711 Balanced Inputs.

At the top an On/Off [BYPASS] switch routes the signal into the Effect (Up: Active) or to the bottom output gain stage (Down: Bypassed).

The amount of amplification is set by the [GAIN] control, the maximum amount of amplification can be set by the user using the [MAX GAIN] trimmer.

Up to ±5,5v the incoming signal will keep it’s integrity, beyond this point saturation will start to increase. At approx. ±6v a hard clipping will start to occur, this clipping also has a particular quality that at extreme levels it drifts the audio 0v bias reference, moving it upwards which results are similar to a Gate effect.

In the middle, an x2 op-amp based output gain stage with a clipping LED, which monitors the clipping at the output, and an [OUTPUT] control to set the output volume.

Having the top and middle gain stages provides flexibility allowing the user to completely distort the signal on the top stage and tame it’s output level with the second stage.

At the bottom, input and output for both channels (left input is normalled into right input)

Power: 40 mA @+12V; 40 mA @-12V

Width: 6 HP

Depth: 40 mm

Panel: black alu

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. SMD parts are pre-soldered, THT parts to be soldered.

ADDAC714 is a dual channel soft clipping module.
Diode based passive clipping acts as a “brick wall” limiter with a fixed knee given by the inherent diode physics. A passive RC low pass circuit adds a 3,3KHz -3db low pass filter which sculpts the overall tone while also adding further character to the effect.

At the top an On/Off [BYPASS] switch routes the signal into the Effect (Up: Active) or to the bottom output gain stage (Down: Bypassed).

The amount of clipping is set by the [GAIN] control, it mostly works as a threshold control for how much clipping will be applied. As more clipping is applied the signal’s amplitude will also decrease, to compensate for this we set up a gain compensation stage to keep the output amplitude balanced across the Gain range.

Symmetry chooses between bipolar clipping or positive clipping, this relates to the harmonics generated, bipolar for odd and even harmonics (up position) and unipolar for odd harmonics only (down position).

At the second stage, an op-amp based x2 output gain with a clipping led, which monitors the clipping at the output, and an [Output] control to set the output volume.

Having the top and middle gain stages provides flexibility allowing the user to completely distort the signal on the top stage and tame it’s output level with the second stage.

At the bottom, Input jacks for both channels (Left input is normalled into Right input) and output jacks

Power: 40 mA @+12V; 40 mA @-12V

Width: 6 HP

Depth: 40 mm

Panel: black alu

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. SMD parts are pre-soldered, THT parts to be soldered.

While developing our ADDAC105 4 Voice Cluster module we made a new multimode filter to place after the summing mix stage. We were so pleased with it’s sound that decided to release it as a dedicated filter. To make it more interesting we duplicated it’s circuitry to be able to use it in a stereo signal path. To make it more versatile we added a switch to set the working mode from Stereo to Dual Mono where both filters can be used independently.

In Stereo Mode the Left Cutoff is used to control the Right Cutoff. In this case the Right Cutoff Knob and CV Input are simply bypassed and will have no impact on the Right Channel operation. This allows immediate sync of both filter frequencies when the Stereo position is engaged. Optionally there’s a jumper in it’s back that, when placed, connects the Right Controls back to the Right CV control allowing the possibility to control the offset of the Right Channel Cutoff.

Resonance is independent on both Modes and still has to be set manually to match both channels. Both the Audio and CV inputs are normalled from the Left into the Right channels. As standard plugging any input to the Right channels removes this connection.

Technical details:
6HP, 4cm deep
70mA +12V / 70mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

Following our ADDAC103 T-Networks this new module is also inspired by Twin T-Networks circuits used in many lengendary drum machines. A simple 4 voice module with frequency controls for each of the voices. This new module also features CV inputs with attenuverters for each voice Frequency. Due to the specificities of the circuit and to keep the module at a low price these inputs are not callibrated to 1v/octave. At each voice input there’s a gate to trigger converter so any input source is possible. Audio inputs can also be used as an input, in this case and due to the nature of the gate to trigger converter, each voice can be used as very destructive filters. The top 2 channels feature a higher frequency range, the bottom 2 channels feature a lower frequency range. Here is a demo video about it.

4 Voices each with:

• Frequency control with CV input and attenuverter Frequency Range Switch, Low/Mod/High

• Trigger Input

• Audio Output

• Summing Mix output with Volume control
 
Technical details:
8HP, 2.5 cm deep
50mA +12V / 50mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

This is the last module in our T-Networks series, a straight forward 4 voice module with frequency and decay controls for each of the voices. As the name already unveils we added a noise source and created 2 different circuits that explores the timbre of a t-network when used to filter noise. There are 2 different circuits in this module, voices 1 to 3 have a pre-vca t-network filter while in voice 4 the t-networks filter applied post-vca.

At each voice input there’s a switch which sets which type of input to use, this signal will be used to control an internal VCA hence why the type of setting defined here is important: 1. Trigger - Any incoming CV will be converted into a 1ms trigger as soon as it crosses it’s fixed threshold. 2. Mute - This disconnects then incoming signal effectivelly muting the voice. 3. Envelopes - This can be used with CV sources as well as Gate sources and simply follows the input signal. This incoming signal will then be processed by a slew circuit which adds a decay factor allowing the user to set the “Tail” of each voice. Trigger mode is mostly dedicated for percussive sounds while the Envelope mode is open to any external envelope control and able to control noise swooshes, swirls, crackles and pops simply out of t-networks filtered noise.

Please check more details on the Addac website.

4 Voices each with:

• Frequency control

• Decay control

• Timbre type, Hat/Snare (Voice 1 to 3)

• Frequency Range Switch, Low/Mod/High (Voice 4) Input

• Audio Output

• Also and overall Summing Mix output with Volume control and 2 diferent output types (Normal/Dirt)

 
Technical details:
• 8HP, 4cm deep
• 40mA +12V / 40mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

Following our ADDAC103 T-Networks this new module is inspired by it’s simplicity. This is a 4 voice Square Oscillator with VCA, FM switch and a slew decay for the incoming Trigger IN. All voices are then sent through a Multimode Filter. Each voice has it’s own VCA input where any input is accepted (Trigger, Gate, CV) The [DECAY] controls the slew decay applied to the incoming signal, if [DECAY] is fully anti-clockwise then it works as a Mute. The [FM ON] switches activate/deactivate the FM input coming from the previous voice: Voice 1 FM comes from voice 4, voice 2 FM comes from voice 1, and so on, so you can FM all of them in a FM loop. Demo videos can be found here and here.

All 4 voices are summed and sent through a filter with controls over [CUTOFF] with an Attenuverter for the CV input and [RESO- NANCE]. Three filter outputs are provided [LOWPASS], [BANDPASS] and [HIGHPASS]. The [EXTERNAL IN] input can be routed through a jumper on the back of the module allowing the incoming signal to go to: 1. the filter input for processing an external audio source. 2. all of the 4 voices Frequency control allowing for some experi- mental CV control over pitch of all 4 voices at the same time (due to the specificities of the circuit and to keep the module at a low price these inputs are not callibrated to 1v/octave).

 
Technical details:
8HP, 4.5 cm deep
40mA +12V / 40mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

This new module should not be judged by it’s size, at 6hp it’s packed with features. At its core it features a noise source and two precision Sample & Holds with 0.01% of maximum deviation from the Input which allows for quantized signals to be sent through without any noticeable detuning or the typical voltage drops over time. The Sample & Hold sections can also be used as a Track & Hold meaning it holds the incoming input while the Trigger input is ON and lets the input flow to the output when the Trigger input is OFF. Each section also features it’s own slew processor with a single control over attack and decay and an ON/OFF switch. The noise signal is normalled to both sections inputs, meaning that without a jack plugged into the Input the sample and hold function will act upon the incoming noise signal generating random CV values. The [Trigger A Alternate] switch allows to Link both sections so that any trigger input in Trigger A will alternate between triggering the A and B section.

Besides each section outputs there’s also 4 extra outputs: Noise, Difference, Average and Sum. The [Noise] output is coming from the noise source, the [Difference] output is the subtraction of section A minus section B, the [Average] output is the sum of both A plus B and then divided by 2 and finally the [Sum] output is the sum of both A plus B sections.

Technical details:
6HP, 4.0 cm deep
50mA +12V / 50mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

There are two equal sections in this module labeled A and B. This module is a peculiar type of mixer that instead of just summing two input signals (X & Y) it also allows the possibility to subtract the two signals. It works both for audio and CV signals and hence the possibility to get the diference of two CVs or cancel the phase of two audio signals. The resulting signal, of sum or subtraction, is then routed through a switchable (on/off) full rectification circuit labeled: Absolute. After this the gain of the mixed signal goes through another attenuverter labeled: Amplitude to control the resulting signal gain which, being an attenuverter, also allows the possibility to invert the incoming signal. After the Amplitude comes an AC/DC coupling switch followed by an bipolar Offset knob.

Besides the normal output there’s also an inverted output for each of the A & B sections. The outputs of section A & B are also summed and sent to the Average Output. Using a single input, just the X or Y input, the module can also be used as a simple dual Attenuverter & Offset CV processor with full rectification and AC coupling options.

2 independent sections each with:

• 2 inputs with gain attenuverters

• Amplitude attenuverter and bipolar Offset

• Absolute/Bipolar and AC/DC switches

• Output and inverted output

• 2 leds monitor the Output polarities and gain.

• Average mix output of both sections

Technical details:
8HP, 4.0 cm deep
?mA +12V / ?mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

Following our T-Networks series we came to realize how important it is to have the right input signal for firing drum modules or envelopes, Gates and Triggers are often looked at as similar signals but at times it really makes a difference and results will change drastically depending if a Gate or a Trigger is fed to the input of such modules.

This led us to develop this simple yet effective Gate to Trigger. A four channel converter with bypass switch for each channel. Any input Gate will be limited to a 1ms Trigger.

Technical details:
3HP, 2,5 cm deep
10mA +12V / 10mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. At this point there is no assembly manual but it is only a handful of components, super easy. The user manual is here.

DIY level: easy. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

Inspired by our ADDAC701 VCO waveform mixing section, our new VC Signal Router also updates our legacy X-Fade/Panner to a stereo configuration that also allows 4 quadrant mixing. Featuring two dedicated X-faders and a stereo VCA that can also be used as a third X-Fader. All controls have their own CV inputs and dedicated Attenuverters for precision control. 4 quadrant mixing is achieved by using the stereo Master as a X-fader between left and right channels, this way you can plug 4 audio sources and sweep/crossfade between each and any of them using the 3 x-faders. Plug any 4 sources (4 waveforms of a VCO, 4 LFOs, 4 envelopes...) and sweep through morph through or have them all mixed together. For other configuration types Left and Right X-fader channels can be routed through the Master stereo VCA or sent directly to the outputs. A stereo Direct input can also be routed through the Master VCA or sent straight to the outputs. The Mono Sum output always mix Left and Right outputs together allowing the possibility to use the module as a peculiar 6 channel mono mixer. It can be used for both Audio or CV Signals.

• 6 mono inputs

• 2 dedicated X-faders with Control knob + CV Input and Attenuverter Each X-fader can be routed through the Master mix or straight into the outputs.

• Master channel can be used as a stereo VCA or an X-fader

• Stereo direct inputs can be routed through the Master mix or straight into the outputs.

• Fully analog audio path with high quality/low noise VCAs.

Technical details:
8HP, 4.5 cm deep
40mA +12V / 40mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

Inspired by Twin T-Networks circuits used in many lengendary drum machines we developed a simple and straight forward 4 voice percussion module with frequency controls for each of its voices. At each voice input there’s a gate to trigger converter so any input source is possible. Audio inputs can also be used as an input, in this case and due to the nature of the gate to trigger converter, each voice can be used as very destructive filters. Here is a DivKid video about it on YouTube.

Features:
4 Voices each with: Frequency control, Frequency Range Switch, Low/Mod/High, Trigger Input, Audio Output, Summing Mix output with Volume control
 
Technical details:
6HP, 2.5 cm deep
40mA +12V / 40mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

This small utility is the pedal's lover best friend, it allows 2 diferent chains of pedals to be independently connected to your synth. The Send channels attenuate the synth level to instrument level. The Return channels amplify the signal from instrument to synth level. Here's a demo video about the module.

Technical details:
4HP, 3 cm deep
Max 10mA +12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

The first modules from our Eurorack Bridge system! A pair of ADDAC213As acts as a simple one-cable bridge between different cases. By itself the ADDAC213As can send/receive 8 CV or audio signals between your cases, but can be expanded to bridge two cases for up to 24 signals at the same time. Use a pair of ADDAC213As to send & receive 8 CV or audio signals between distant points in your case, between two separate cases, or between your case and a friend's case.

 Less clutter, less spaghetti, faster connection!

 There’s nothing better than being able to connect that controller skiff with just one cable to your main system. At a gig, in the studio, when jamming with a friend, give yourself a gift by grabbing a pair of ADDAC213As.

 The modules can be installed in normal position or a 180 degree position to fit any need and any case design. Here's a video about ADDAC213A & B.

Expansion possible by the ADDAC213Bs:



Each ADDAC213A module can be connected through a ribbon cable connection on its backside with up to two ADDAC213Bs. Each ADDAC213B module added expands the channels options of the ADDAC213A by adding 8 more channels.

With two 2 ADDAC213Bs connected to each ADDAC213A module, you’ll have a total of 24 channels going between your cases with a simple one-cable bridge.

Between the ADDAC213A pair and the ADDAC213B, your cases never looked so elegantly connected together!



The ADDAC213As are always sold as a pair of 2 modules and an included 50cm ribbon cable.

Technical details:

Width: 6 HP

Depth: 2,4 cm

Passive / Does not draw current

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy.

The ADDAC213B is the second pair of modules from our Eurorack Bridge system!

 A pair of ADDAC213Bs can be used in standalone to send/receive 8 CV or audio signals between different points inside the same case or as an expansion to the main pair of Eurorack Bridge modules, the ADDAC213As.
 Here's a video about ADDAC213A & B.

Standalone use

: Two ADDAC213B modules can be connected to each other with the use of a single ribbon cable and then used inside a case to carry signals between distant points without the need for long cables. Less clatter, less spaghetti, more space of your fingers on those knobs! A single pair can send & receive up to 8 CV or audio signals between different points in your case at the same time. The modules can be installed in normal position or a 180 degree position to fit any need. 

Do you have modules that you often use together in different areas of your case? Would you prefer that each row’s cables don’t mingle with cables from other rows? Grab yourself a pair of ADDAC213s.


As an Expansion to an ADDAC213A

: Each ADDAC213B connected to the backside of an ADDAC213A adds 8 more channels to the main bridging functionality of the ADDAC213A.

 Up to 2 ADDAC213B can be connected to an ADDAC213A module, expanding the bridging between two difference cases to a total of 24 channels. If you’re looking for a simple one-cable bridge between your various cases, then look no further than the ADDAC213A.

 Between the ADDAC213A pair and the ADDAC213B, your cases never looked so elegantly connected together!

ADDAC213Bs always come in pairs. Price is for a pair of modules (2 modules) including two 50cm ribbon cables. Only one is used to connect the two ADDAC213B together but two are necessary when connecting the two ADDAC213B to two ADDAC213A.

Technical details:

Width: 3 HP

Depth: 2,5 cm

Passive / Does not draw current

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy.

This is our VC Rotator, a stepped routing module for any type of signal (audio, cv, gate, trigger...). Similar to a VC switcher but in this case there's the same number of inputs than outputs so, instead of 4 to 1 or 1 to 4, this module is always 4 to 4 but it can be patched for 2 to 2 and 3 to 3 step actions. All four inputs get routed to the four outputs depending on the CV and Clock controls and are divided into 4 routing steps:

1. routes all inputs to the same number output: 1:1, 2:2, 3:3, 4:4

2. routes all inputs to an offset of 1: 2:1, 3:2, 4:3, 1:4

3. routes all inputs to an offset of 2: 3:1, 4:2, 1:3, 2:4

4. routes all inputs to an offset of 3: 4:1, 1:2, 2:3, 3:4

Direction determines if the clock input goes forward or backwards.

Going forward it can be set to 2-3 or 4 steps using the Rotate knob offset, going backwards always sync to 4 steps even if offseted by the Rotate knob. For 2 & 3 step action input 1 is normalled to input 3 and input 2 is normalled to input 4. Reset resets the internal clock to the first step. Pendulum, external sequencing or any complex CV actions can be achieved using the CV input and dedicated attenuverter. 4 leds monitor which input is routed to output 1.

Features:

4 Inputs

4 Outputs

Direction Switch

CV Rotate with Attenuverter

Clock and Reset Inputs

4 Monitor Leds
 
Technical details:
?HP, ?cm deep
??mA +12V / ??mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy. Most SMT parts are pre-populated, THT parts and possibly some bigger SMT parts to be soldered.

IN THE CURRENT BATCH WERE SOME RESISTORS MISSING. PROBLEM WILL BE SOLVED IN A COUPLE OF DAYS, THEN IT WILL BE AVAILABLE AGAIN!

With the ADDAC304 Manual Gates you'll be getting 8 manual gates (0 +5v) in a nifty package - a perfect way to perform on and control your modular system. The ADDAC304 comes with an interesting twist: 4 out of the 8 available gates can act as momentary switches, outputting the signals in their respective inputs when each gate’s button is pressed. Here's a video about the module.

FAQ:

Q: Are the buttons momentary? Will the module send a gate-high signal for as long as the button is held down?

 A: Yes! The ADDAC304 uses momentary switches (check the ADDAC305 if you want toggle switches instead). The module will output a +5v signal for as long as the button is held down, and when released it will output 0v.

Q: Will the module output gates when nothing is connected at the inputs?

 A: If a jack is plugged in an channel which has an input, then when you press the button the incoming signal will be output instead. If there is no input then the channel behaves like all other channels, firing +5v when pressed and 0v when not pressed.

Technical details:
8HP, 2,5cm deep
10mA +12V

CV inputs: ± 10v

Gate outputs: 0 +5v

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. Most parts are THT, but it contains some small SMT parts.

Here's the second module of our 700's Heritage Series. Inspired by Moog CP3 mixer, this is a totally discrete analog mixer and it's not, by any means, your standard breakfast mixer, although it can behave like one. This is a wolf in sheep's clothing. Despite its harmless looks there's a dark snarly soul behind that panel that wants to take your sounds into a realm of gritty gnarly growls. Here are 2 videos about the module: video 1 and video 2.

Features:

4 Independent channels with input jack and volume knob

1 Feedback/gate knob

Master output volume knob

6 Front panel trimmers allows user to adjust the Input resistor trimmer for each channel, feedback and master output

1 Front panel trimmer allows to adjust the mix Bias

 
Technical details:
8HP, 3cm deep
60mA +12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here. UPDATE: in the original building instructions there are 3 different values of trimmers - Accac changed that, 50k trimmers are exchanged by 100k ones, please use them instead!

DIY level: medium. Most SMT parts are pre-populated, THT parts and bigger SMT parts to be soldered.

Our Phono Pre Amplifier module, connect your turntable to it and bring it's sound straight into any of your patches.

Technical details:
4HP, 4,5cm deep
40mA +12V

Panel color: red

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy. All SMT parts are pre-populated, THT parts and possibly bigger SMT parts to be soldered.

The ADDAC305 Manual Latches is a combination of 8 manual latching switches in a small and elegant module: each button toggles between Gate high / Gate low when pressed, outputting a 5V gate signal. Additionally 4 of the 8 available latches, sport inputs and can act as manual latching switches, allowing the incoming signal to pass to the output when the button is toggled. Here is a video about it.

CV I/O:

CV inputs: ± 10v

Gate outputs: 0 +5v

Technical details:
8HP, 2,5cm deep
10mA +12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. All SMT parts are pre-populated, THT parts and possibly bigger SMT parts to be soldered.

ADDAC306 is a 5 channel multi-directional CV generator. You can think of it as a "sweet spot" controller, or a hands-on way of transiting from one state to another. Each of the five channels has MINIMUM, SPAN and DIRECTION controls, a common CV IN and a common TRANSITION CONTROLLER slider.

MINIMUM sets the minimum channel voltage. SPAN sets the voltage range of the channel.

It essentially sets the maximum voltage that can be output from the channel, relative to what the current channel MINIMUM is. For a given SPAN value, if the MINIMUM voltage is changed then the maximum voltage output from that channel will also change respectively. DIRECTION sets whether the voltage transition for each channel goes from MINIMUM to maximum, or maximum to MINIMUM. The TRANSITION CONTROLLER slider controls the transition from the minimum value (A) to the maximum value (B) or vice versa, according to the settings of each independent channel. Moving this slider generates 5 different voltages with 5 different ranges and directions. The transition can also be operated from a CV source at the CV IN, in which case the slider position acts as an attenuator for the incoming voltage. The maximum range of each channel can be set to either 5 or 10 volts, by 5 jumpers in the back of the module. Only positive voltages are generated at the output.

Using the CV IN you can use two ADDAC306 modules to expand your control options to 9 voltage outputs under one common slider control. Use the VC Transitions to multiply the polyphony of a single CV sequencer by passing its outputs through the ADDAC207. VC Transition makes for an awesome state transition controller. Plug its outputs to various CV controller parameters of your audio effects modules. Set the slider to position A, and set the minimum values for each channel. Then move the slider to position B and set the SPAN settings for each channel. Use the TRANSITION CONTROLLER slider to morph from state A to state B and backwards. Flip the DIRECTION switches to change the direction of the transition for each channel. Use the CV IN to automate the transition using LFOs, ADSRs or sequencers. Plug the output of your ADSR envelope to the CV IN and set the channels differently to get 5 different ADSRs from one common source. This module was developed based on an initial idea by Konstantine Fioretos.

Control Voltage I/O:

CV inputs: + 5v

CV outputs: jumper selectable: +5v or +10v

Technical details:
8HP, 4cm deep
40mA +12V, 20mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. All SMT parts are pre-populated, THT parts and possibly bigger SMT parts to be soldered.

Another addition to our ADDAC300’s Expressive Controls Series. Preceded by the release of our ADDAC303 Muscle Sensing module this is the second module we make to take advantage of the physical body as a control source. This module originated from a simple idea: using one’s heart beat as a control source.  Using a clip-on sensor, that can be attached to a finger or an ear lobe, the user’s heart rate will be aquired by sensing the blood flow passing under the sensor. This pulse will generate a trigger and an AD envelope. Clip-on sensor is provided with the module. Here is a video about it.

Features:

0 +5v Trigger output

0 +10v Envelope output with:

Attack, Decay, Amplitude and Offset controls

Two leds monitor the Trigger and Envelope Outputs

Technical details:
4HP, 3,5cm deep
60mA +12V, 10mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy. All SMT parts are pre-populated, THT parts and possibly bigger SMT parts to be soldered.

This is our new VCO, we discontinued our ADDAC701 VCO a few years back and since we’ve been wanting to release a more stable version with better pitch tracking increasing pitch reliability further minimizing the detuning issues of analog VCO’s.

For this new revision we chose to use the modern version of the CEM3340 ic from CoolAudio and add the triagle to sine circuitry of our previous VCO. This new version is extremelly stable over 7 octaves. We also added a new Mix section which allows mixing of all waveforms controlled by 3 knobs SIN/TRI, MIX and SAW/RECT.

Features:

Frequency knob with 6 octave range

Fine Tune knob with 12 semitone range

Octave switch with 6 octave range

1v/octave cv input

Linear FM cv input with attenuator

LFO/VCO switch sets overall frequency range

Soft/Off/Hard Sync switch

Pulse Width control with initial knob and cv input with attenuator

SINE, TRIANGLE, SAW and PULSE outputs

Mix output controlled by 3 knobs SIN/TRI, MIX and SAW/RECT

Technical details:
8HP, 3,5cm deep
60mA +12V, 60mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: medium. All SMT parts are pre-populated, THT parts and possibly bigger SMT parts to be soldered.

Here's our new filter inspired by the original WASP Filter.

Features:

1) Four diferent filter types: Low-Pass, Band-Pass, Notch-Pass and High-Pass with independent audio outputs. 2) Cutoff features a voltage-controlled cv input with a dedicated cv attenuator pot. 3) Two switches selects different Resonance clipping paths: no clipping / diodes and Resonance depth: high / low. 4) The Main output filter type can be selected through a 4 position switch. 5) The Main output circuit features a Distortion/Fuzz circuit that adds extra harmonics to the filtered audio. 6) Phase switch selects the Main output phase polarity. 7) One Led monitors the audio signal of the main output.

Here are 2 videos about it: one and two. 

Technical details:
8HP, 3cm deep
60mA +12V, 30mA -12V

Panel color: black

This is a Do-It-Yourself kit, not an assembled module. Building instructions can be found here.

DIY level: easy/medium. All SMT parts are pre-populated, THT parts and possibly bigger SMT parts to be soldered.