Building these DIY kits happens on your own risk. We can't do support or give a guarantee for correct function, because that depends on your own skills. Be responsible and check the building instructions before you buy. Thank you!
Altered States is a dual state variable voltage controlled Filter
Dual analog state variable filter in a 20hp module, depth 45mm. The filter cores are 12db/oct and based around the clean and reliable 2164 Quad VCA chipset and offers full voltage control over cutoff frequency and resonance as well as individual outputs for each filter response, including a variable state output with manual as well as voltage control. The filters are identical in featureset, and featureset is as follows:
Controls: Frequency cutoff control knob, Resonance amount control knob Frequency cutoff CV attenuverter knob, Input level attenuator with overdrive knob, Variable state control
minishaft type, Resonance amount CV attenuverter minishaft type, toggle switches for combining (links the filter B frequency cutoff controls to filter A), and serial or parallel input
Inputs/Outputs: Filter audio input, Frequency cutoff CV input, Frequency cutoff 1V/O scaled input, Resonance amount CV input, Variable state CV input, Variable state output (LP-Notch-HP), Lowpass output, Bandpass output, Highpass output.
Altered States is a highly versatile dual filter, the input and resonance controls have plenty of range to dial in anything from smooth and clean to harsh, overdriven and screaming resonant tones. The cores are very stable and will give you around 5 octaves of 1V/O tracking sine wave self-oscillation, the LP, BP and HP outputs each have a different phased sine. The state outputs offer seamless fading between lowpass and highpass filter response, with an all-pass/notch response around 50% of the knob setting. With voltage control available on frequency cutoff as well as on resonance and state outs, the Altered States is perfectly suited for the modular environment.
Building instructions can then be found here.
DIY level: advanced.
The first collaboration between RYO and KYMATICA DEVICES, a dual VCA / Crossfader / Four-Quadrant-Multiplier (Ringmodulator / VC-polarizer) with mix output. The output of the first channel is normalized to the input of the second. Works for audio as well as CV. Tune in, multiply, fade out! Switch position upside down A > A: In this mode input A and the CV input acts as a Four Quadrand Multiplier. It will do ringmodulation and voltage controlled polarization (bipolar VCA). Switch position 0 > A: In this mode input A and the CV input will act as a normal linear VCA. Switch position B > A: In this mode the CV input will control a crossfade from input B to input A.
Width: 8HP, depth: 40 mm, max power: +12V 34 mA / -12V 32 mA
Building instructions will follow soon and can then be found here.
DIY level: medium.
An extremely useful module: Ampmix is an easy to build 4-channel amplifying mixer/attenuator with 2.0x gain (6dB) and 5.0V offset on each channel in an 8HP module. No calibration required. It was designed as a handy CV mixer and processor with good precision, high input impedance and buffered outputs. It could be upgraded for even better precision as described in the assembly manual. It will also work great with audio, even with full gain giving some distortion possibilities or gaining external gear. It works as a 4 channel mixer, 1 attenuator + 3 channel mixer, 2 attenuators + 2 channel mixer or 4 attenuators. Width: 8HP, depth with power cable attached: less than 35 mm, power: +/- 22 mA. More detailed info, demos and instructions can be found here.
DIY level: easy.
The RYO Aperture is a vactrol lowpass filter and VCA module inspired by the much beloved 292 Lopass Gate from the Buchla 200 series modular system of the 1970s. However, rather than being a straight up clone, the Aperture is a newly developed and reworked design for eurorack modular synths. Aperture can be used as a 12dB lowpass filter, a VCA or a combination of the two similar to the 292 but also adds a new switchable resonance circuit. This solution gives you no less than 6 different characteristics! Width: 8HP, depth: 27 mm, max power: +12V 50 mA / -12V 70 mA (when self oscillating in max pitch), average power: +12V 25mA / -12V 45mA (with no self oscillation). More detailed info, demos and instructions can be found here.
DIY level: medium.
The RYO Penta is a simple, but extremely useful compact 4HP 5 step sequencer with buffered output, schmitt triggers on inputs and reverse polarity protection. Totally brilliant for using multiple ones on a patch to control various parameters and generate more 'life', specially if you run for example a 4 step sequence on pitch and parallel a 5 step sequence on filter cutoff, it will generate patterns which are not so easily recognisable. Works brilliant with Paths to generate longer sequences. Sending a clock to the CLK input will progress the sequence, the Penta has 5 minishaft potentiometers for adjusting each of the 5 steps voltages, ranging from 0 to +5V. A pattern length switch is available for selecting 3, 4 or 5 steps pattern length, this can of course also be set by using an external gate or trig into the RST (Reset) input. RYO also added a bonus for the more seasoned builders in the form of +5V GATE output solder pads for each of the sequencers 5 steps, as well as an input pad for HOLD which will lock the sequence to the active step as long as a gate is present. Info on how to perform a homebrew expansion can be found on the last page in the assembly manual.
Width: 4HP, depth: 39mm, power: +12V 6mA / -12V 1mA. Demos and instructions can be found here.
DIY level: easy/medium.
A simple and space-efficient linear voltage controlled amplifier (Eurorack) for processing of control voltages as well as audio with precision and a good clean sound. The 3xVCA is great for adding extra life and dynamics to CV modulations as well as for regular audio duties such as a good sounding amplitude modulation all the way thru the audio spectrum. With a very simple modification 3xVCA becomes both linear and exponential by normalling the VCAs in a cascading fashion. Width: 4HP, depth: 51mm, power: +12V 26 mA / -12V 21mA. Demos and instructions can be found here.
DIY level: medium.
4:4 cycling sequential switch, featuring simultaneous forward/reverse stepping, hold, reset, and an additional voltage controlled mode based on the same design as our VC Sequencer. Also on board are push buttons for each function enabling you to play and perform the switching with a more human input. This sequential switch will do all your standard 1>2, 1>3, 1>4 or the other way around with great real-time as well as external voltage controllability. But its when you start playing around with multiple sources and destinations that things start getting fun and weird! You could for instance shuffle around four different trigger patterns to trigger four different percussive generators for interesting variations, or why not 4 oscillators shuffling between 4 different destinations, panned and processed in various ways?
Width: 8HP, depth: 46mm, power: +12V 30 mA / -12V 8mA. Demos and instructions can be found here.
DIY level: medium.
A compact, easy to use, easy to build and great sounding distortion module (Eurorack) which will also work as a VCA if desired. Also on board is an LED based limiter circuit which limits the signal thru a set of 4 LEDs which can be seen on the panel, for adding a different flavour to your distortion. Width: 6HP, depth with power cable attached: less than 35 mm, power: +/- 15 mA. Demos and instructions can be found here.
DIY level: medium.
The RYO Airtenuator I is a floating passive attenuator you connect between two modules in your rack via patch cables, acting as a volume/modulation depth control between the source and destination. Instead of being built into a module that sits mounted in your modular case these attenuators "float" in the air held up firmly by the two cables connected to it, thanks to the firm fit it is possible to make precise adjustments one-handed and they can also easily be twisted into an angle that works best for the specific task and placement in your patch. This kit includes 3 Airtenuators.
Length: 58 mm, Width: 16 mm, Power: 0.2 mA @ 10V signal +/-20% from the output jack. Impedance: 50k +/-20% (variable impedance if used backwards). Instructions can be found here.
DIY level: easy.
On the first look this seems a bit boring - but it's not! This modules are powerful tools when you work with sequencers and clocks and you want to create interesting rhythmical variations. Combined with for example the 4ms Quad Clock Distributor and driving some Pentas this modules become weapons.
The NOR/OR module can be patched as two NOT gates,one NOT gate and one 2- or 3-input NOR/OR gate, one 2-input NOR/OR gate and one 2- or 3-input NOR/OR gate or one 4-input NOR/OR gate. Gate one has three inputs, the second has two. The OR out from gate one is being normalled to input 1 on gate two.
The NAND/AND module can be patched as two NOT gates,one NOT gate and one 2- or 3-input NAND/AND gate, one 2-input NAND/AND gate and one 2- or 3-input NAND/AND gate or one 4-input NAND/AND gate. Gate one has three inputs, the second has two. The inputs on gate one is normalled in a 1>2>3 fashion for efficient cable and time-saving patching. The inputs on gate two has also been normalled 1>2, with the AND out from gate one in turn being normalled to input 1 on gate two.
The XNOR/XOR/NOT module can be patched as two NOT gates and one 2-input XOR gate, one NOT gate, one 2-input XOR gate and one 2-input XNOR/XOR gate, two 2-input XNOR/XOR gates or one NOT gate and one 3-input XNOR/XOR gate. Gate one and two has two inputs, the third has one. The XOR out from gate one is being normalled to input 1 on gate two. The XOR out from gate two is being normalled to the single input on gate three (NOT).
Width: 4HP, depth: 50mm, power: +12V 14-28mA / -12V 0mA. Building instructions can be found here.
DIY level: easy.
Voltage controlled sequencer. Compact 8-step sequential voltage source in 10HP with optional trigger/gate output expander. Can be expanded to 16 steps, using two VC Sequencers. Two modes: 1) Can be used as classic forward/backward operation using a clock or 2) driven by any control voltages or audio. Examples of this would be a ramp to make it go forward, saw to go backwards, triangle for pendulum, S&H noise for random, another idea would be to create a manually adjustable quantizer. You could also use another sequencer's pattern to control the pattern of the VC Sequencer, the possibilities for exploration are endless. Expanders will offer chaining 2 VC Sequencers for 16 step operation and unlimited extra parallel channels of CV or gate/trig using the TrigXpander with 4HP each. The 16 step expander will add an extra latency and lower the maximum clock frequency in 16-step mode. One interesting thing is that you can also dial in negative voltages, the range is from -5V to +5V.
Width: 10HP, depth: 45mm, power: +12V 22 mA / -12V 11mA. Demos and instructions can be found here.
DIY level: medium.
Trig Xpander will give your VC Sequencer 8 individual outputs for each step outputting either a trigger or a gate, selectable with a jumper on the pcb, and a 9th output that gives you a trigger for each step progression. Also on board is a trimmer for setting the trigger length to your liking (ca 1-20 ms). Usually you wan't to set this as low as possible to reach higher rates. Different trig lengths can give a different sound from pinging filters or striking lowpassgates. Some vintage gear also require longer trigs. The gates are high for the full duration of each step. The outputs are diode isolated, this allows for passive mixing of the outputs using a passive multiple/stackcable/IV cable, or a switched multiple/OR combiner such as the Doepfer A-182 or a Grayscale Binary.
DIY level: easy / medium.
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Exploding Shed - DIY kits, modules & parts
Based in Leipzig, Germany
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