The ATT Passive Attenuator is a simple 2 channel attenuator that can be used to attenuate audio or CV signals. For example to level the volume of two audio signals or to limit modulation signals. This DIY kit is very beginner friendly.

Power: no power required
Width: 2 HP
Depth: 27 mm
Panel: Black FR4

This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Build guide and infos can be downloaded here.
DIY level: Mega Easy

The MLT Passive Multiple is a 1 input to 6 output or 2 input to 3 output signal multiplier. If nothing is patched into input 2, it is normalized to input 1. As the device is passive, it can also be used to combine signals. For example 3-to-1 or 6-to-1. This DIY kit is very beginner friendly.

Power: no power required
Width: 2 HP
Depth: 27 mm
Panel: Black FR4

This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Build guide and infos can be downloaded here.
DIY level: Mega Easy

The FPF Fixed Passive Filter is a simple utility filter with fixed cutoff frequencies for Highpass, Lowpass and Bandpass. If you want to roll off the high frequencies or eliminate some rumble on synth sounds it does a pretty good job cleaning up signals. It is a simple passive RC filter combination and therefore causes a little loudness drop on your signal. This DIY kit is very beginner friendly.

Power: no power required
Width: 2 HP
Depth: 27 mm
Panel: Black FR4

This is a Do-It-Yourself kit, not an assembled module. The kit includes all parts to build the module. Build guide and infos can be downloaded here.
DIY level: Mega Easy

Dronesynth is a four OSC stereo Drone synthesizer in a beautiful wooden box. It features two channels with two Squarewave-OSC each. The oscillators can be synced per channel to generate the typical sync sound, which sometimes sounds like a special kind of "pseudo-filtering". Then the volume of OSC-1 and OSC-2 per channel can be balanced by the Mixing circuit. After that, both channels are fed into a Filter circuit, which share the Cutoff control. The Filter is realised as a kind of Tilt-EQ, a combination of high-shelf and low-shelf. Add more highs = less lows. More lows = less highs. Thereby it is very simple and effective to shape the overall sound of your stereo drones. After the Filter comes a VCA, which either stays permanently open (what makes the machine a Dronesynth) or it can be modulated by external CVs between 0 to +5V.  The audio result is sent to two 6,3mm outputs, which itself feature a mixing circuit (like in many synths) to be able to use it mono with only one cable or stereo.

It makes most sense in a setup with some effect pedals or effects afterwards. We made it for a simple hands-on approach for experimental musicians. Amazona published a test of the Dronesynth (german language).

Controls:

• Freq A1 / Freq B1

• Freq A2 / Freq B2

• Sync A on/off / Sync B on/off

• Mix A / Mix B

• Cutoff Frequency

• Power On/Off (it acually switches between battery and power supply)

Connectors:

• Power Input

• Out A
• Out B

• VCA CV Input

Power:

9V battery or +9V DC power supply (5,5/2,1mm barrel connector, center positive)

This kit has all the necessary parts to build, but no battery or power supply. You will also need some wood glue and tools to build it. Building instructions and manual can be downloaded  here.

DIY level: medium, wood parts and mechanicals will be a bit tricky if you are not used to.

Noisefoc (now v1.1 with better CV input) is an experimental Oscillator, good for noise and Pan Sonic style buzz sounds. It's nice as a pure sound source or as a base for Hi-Hat and percussion sounds. Noisefoc is a great learning project, in the manual the basic parts and their functions are explained. It is based around three CMOS NAND gates as oscillators, controlled by potentiometers and a light dependent resistor (LDR). There's an optical representation of the frequencies via LEDs, two mixing circuits (different sound via diode or resistor mixing) to mix the oscillators and a power starving function which makes the device completely out of control. The Eurorack version features a CV input for pitch influence via optocoupler.

The frontpanel was designed by Hannes Pasqualini / Papernoise.

DIY level: easy. Download the building instructions and manual here.

VCO-1 (v1.4) is a purely analogue VCO (oscillator) for the modular Eurorack system. It can complemented by EXP-1 Expander module to add many functions like Sync, lin. FM, Wave Morphing, LFO etc. VCO-1 is temperature stable and provides a clean 1V/oct tracking over minimum 4 octaves. VCO-1 and EXP-1 are a powerful combination of modules with lots of instant fun! High quality parts, switches, pots and knobs, good feeling and big enough for comfortable everyday work, no fiddly controls. Check out the module on Modular Grid.

Here is a build video about VCO-1 and EXP-1 by Synth DIY guy. Very nice to watch before you build it, specially for beginners.

Controls:

Tuning (Coarse) ca. 20Hz - 20kHz

Tuning (Fine) ca. 8 half tones

Pulsewidthmodulation (PW)

Connectors:

1V/oct input for CV-controlled pitch

PWM input for CV-controlled pulsewidth

Pulse audio output

Saw audio output

Power consumption: +12V: 18mA -12V: 17mA. Width: 10 HP, depth 35mm. This kit has all the necessary parts to build, including front panel and power cable. Building instructions and manual can be downloaded here. The frontpanel was designed by Hannes Pasqualini / Papernoise.

DIY level: medium. After finishing it, the 1V/oct tracking has to be adjusted, what might need some experience.

EXP-1 (v1.3) is an expander module for our analogue Eurorack oscillator VCO-1. It adds an LFO (bi-polar LED) with two waveforms (square, triangle) and various modulation targets, sync, lin. FM, wave morphing, an additional triangle output etc. Together with VCO-1 it is a complex oscillator with lots of internal or external modulation possibilities. Check out the module on Modular Grid.

Here is a build video about VCO-1 and EXP-1 by Synth DIY guy. Very nice to watch before you build it, specially for beginners. 

Controls:

LFO Freq. ca. 0,01Hz - 200Hz

LFO Amt. (target via selector)

Lin FM (int. LFO / ext. signal)

Morph (int. offset / ext. CV)

LFO Shape (Saw / Square)

LFO Target (Morph / PW)

Morph Mode (Tri-Spare / Tri-Saw)

Connectors:

LFO Freq (ext. CV influences LFO Freq.)

Lin FM Input

Morph CV Input

Sync Input

LFO Output

Morphed Output

Triagle Output

Power consumption: +12V: 16mA -12V: 18mA. Width: 10 HP, depth 35mm. This kit has all the necessary parts to build, including front panel and power cable. Building instructions and manual can be downloaded here. The frontpanel was designed by Hannes Pasqualini / Papernoise.

DIY level: medium.