New Choral Generator Eurorack Module From nonlinearcircuits

"Triple BBD chorus module to process audio and CV."

The Spice Must Flow

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Somer eurorack spice. Black and Gold panels for the following:

- Malekko Varigate 8+
- Malekko Voltage Block
- Intellijel Quad VCA
- Intellijel Dixie 2+
- Intellijel 1U Noise Tools
- Nonlinear Circuits Triple Sloth
- ALM Pamela’s New Workout (tiny scratch above “Run” in pic)
- Mutable Instruments Yarns

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The Spice Must Flow from Dune.

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AES Modular Eurorack System

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Published on Apr 8, 2020 ambitstudio

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"This is a DIY project. A complete portable eurorack format, modular synthesizer. Modules were built from PCB boards and components Custom screen printed face plates and wood control panel. Installed in a vintage case with real fabric tweed, custom screen printed image on bottom of lid. Includes a one of a kind book explaining each module as well as 8 patch examples for this specific system. Also includes power adapter, power supply and patch cables. This is a one-of-a-kind system. This can be patched into any eurorack system.

Modules:
Nonlinearcircuits 2XLFO
Nonlinearcircuits 4SEQ
Synthrotek Astronoise Oscillator
Barton Musical Circuits Random Resonator
Barton Musical Circuits Random Simple AR
GMSN! Pure VCA
Synthrotek Dirt Filter
Nonlinearcircuits Mixer
Barton Musical Circuits Buffered Multiple
Barton Musical Circuits Keyboard

Also Includes:Manual
15 Patch Cables
Power Supply and Adapter"

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nonlinearcircuits BBX291 VCF

Published on Apr 3, 2020 cirtcele

"Vari-bandwidth VCF based on the Buchla 291, tho the CV sections are completely different and it uses a black box between the PCBs instead of dual vactrols.
https://www.nonlinearcircuits.com/mod..."

Nonlinearcircuits cellF Eurorack Modular Synthesizer - Voice & Action Modules + High Quality Case

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via this auction

Note it's two panels vs individually mounted modules.

"For sale is a complete Eurorack Modular Synthesizer, developed and built by Nonlinearcircuits (Andrew Fitch) in Perth, Australia, in beautiful, fully working condition. The system combines both NLC cellF modules Voice (84 HP) and Action (84 HP) and has a quite obvious West-Coast/Buchla approach to synthesis, but a few filters are also integrated."

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Teuthid Dreaming

Published on Nov 6, 2019 voltlife

"A floaty generative ambient patch, with tentacles! The NLC Squid Axon module replicates and mutates melodies using nonlinear feedback, rhythms are varied with Euclidean clocks, while Pressure Points + Brains is clocked extremely slowly to bring in different 'movements' with varying balance between voices. The voices themselves are mostly wavetable VCOs, with analogue filtering and a lot of reverb and long delays."

Dual LFO VCO 1

Published on Oct 17, 2019 cirtcele

"Upgrade for the NLC thru-hole dual LFO. Now has CV and sync, sine, square, tri and stepped outputs. with switches it ranges from 1 cycle per 20 minutes up to 10kHz.

The stepped out is a S&H sampling the sinewave and clocked internally by the other oscillator.

In this vid the left side is supplying CV to a VCO, the right side is at audio rate and giving the VCO an FM signal. each side is CV-ing the other as well.

TBH it is a std module so I really just have a good play with the dog."

nonlinearcircuits Mobius PiLL - Audio rate chaos generator eurorack module

Published on Sep 7, 2019 cirtcele

"Audio rate chaos generator - contains two cross-coupled PLLs and two LPGs."

via nonlinearcircuits

"This is a chaotic noise module, it is generally not very nice unless you are into noise. In which case, hello!!

There are several papers describing ways to couple PLL (phase locked loop) ICs to create chaos. I have been sitting on a stack of them for years but found the actual circuits quite limited in a synth.

Eventually it clicked that the low-pass filter needed to be a bit fancier than a pot and a capacitor, so this version gets two Buchla style low pass gate/filters.

The circuit contains two PLL chips and two low pass filters. The PLLs are voltage controlled together, the filters are controlled individually.

Normally in a PLL circuit, the output of the phase detector goes thru a low pass stage and then the output of this is used to control the VCO. In this version, the low pass filter outputs are fed to the non-inverting input of an op amp for it's own VCO and the inverting input of an op amp for the other VCO. Maybe the pic describes it best, this is from Intermittent Chaos in a Mutually Coupled PLL’s
System (Shirahama et al), tho I have seen similar circuits in other papers.

It doesn't need an input signal to lock to, it can run on its own, but it can be fun to give it a signal anyway. The other inputs are for Freq CV, LPG1 CV and LPG2 CV. Two of the outputs are from the LPGs and two are from the PLL VCO, these two are pulse/squarewaves, very nice for feeding into filters.

The PLLs and filters are all vactrol controlled but the PCB is a unpatented NLC black-box design, so no need to buy any expensive vactrols.

PCB set = USD23
Panel = USD22
assembled = USD200"

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nonlinearcircuits VCAs fuzz/distortion

VCAs fuzz Published on Aug 23, 2019 cirtcele

"Short demo of the fuzz section on this triple VCA."

"This 8HP module contains 3 VCAs and a fuzz/distortion. The VCAs are similar to the ones used in the NLC Cluster; simple OTA based but work very well.

The fuzz/distortion is part of the bottom VCA and is a typical diode based affair, on the PCB the space for these are thru-hole so you can install Si or Ge diodes or LEDs. Turn the Fuzz pot to 0 if you just want VCA.

PCB = USD18
Panel = USD20
assembled = USD160"

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nonlinearcircuits beat freq 2

Published on Aug 21, 2019 nonlinearcircuits

"Mainly controlled by 2 VCOs, which also supply the audio. Middle section is clocked by 2 LFOs."

via nonlinearcircuits

"The idea for this module came from a schematic that has been floating around the web for years - 'beat frequency indicator'

The idea is to feed the circuit two signals and depending upon which one had the higher frequency the ring of 4 LEDs would light up in a clockwise or anti-clockwide direction. The speed of rotation would indicate how close or disparate the frequencies are. If the signals have the same frequency then just one LED is lit.

The original circuit used 74xxx series ICs for the logic, so it was simple enough to find the CMOS equivalents (sort of), then add gates corresponding to the LEDs and use the spare outputs of one chip to feed pots to make sequences. Then for good measure a discrete XNOR circuit was added to give a psuedo ring-modulator output based on the 2 incoming signals.

In operation this module is quite unique; the CV signals return to 0 between each step, the length of each step can vary depending on the incoming signals. Gates come in spurts. The circular LED display jerks around, sometimes it completes several revolutions confidently and then stutters between two stages, sometimes it shimmers on one spot.

At both audio rates and clock rates, this module is quite unpredictable but always seems to be putting out useful signals.

PCB = USD18
Panel = USD20
assembled = USD160"

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nonlinearcircuits 1U Signum 2

Published on Aug 21, 2019 cirtcele

via nonlinearcircuits

"In the simplest sense, this is a switching module. It is a little different though because it has 3 states rather than just on/off:
\operatorname{sgn}(x):={\begin{cases}-1&{\text{if }}x<0,\\0&{\text{if }}x=0,\\1&{\text{if }}x>0.\end{cases}}
In this case, the module uses approx 1V, rather than 0V, as the switching point, so that it can be controlled by gates. It is simple to bring it back to 0V for those who think it should be.
Also the '0' state is really a result of the diode voltage drops rather than any circuit design trickery.

The signal on the bottom input is fed to the switch of the Switch jack (oh yes) so the incoming signal can switch itself without any help.
The three states actually mean there is a flat spot at the switching point, so the circuit can be used for audio but at slow rates there is a click, so it is far better suited for CV processing.

This circuit originally was used as the nonlinear element in the Primal Hyperchaos and two of them in the Hyperchaos Deluxe. I quite like it on its own, so the Signum Hyperchaos brought the signum section to the panel where it could be used as a stand-alone module. This version drops the chaos and just has the Signum.
The switching is done by diodes rather than a dedicated IC.

The panels are available in white/gold and black/gold in both Pulp Logic and Intellijel formats. Please specify which colour and which format you want when ordering.

Also the PCBs are the same for both panel formats and use a standard Eurorack power connector. There is no provision for the Pulp Logic 3 pin power connector.

PCB and panel set = USD10
Assembled = USD55"

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nonlinearcircuits beat freq

Published on Aug 1, 2019 cirtcele

"Just trying out the proto-type. 2 beating VCOs drive the circuit, the output gate and CV are used to turn on and control a 3rd VCO."

nonlinearcircuits Cellular Automata 1

Published on Jul 14, 2019 cirtcele

"NLC Cellular Automata module demo. It can be used as a CV pattern and gate generator. There is little control over the patterns other than feeding signals into the 4 seed inputs"

via nonlinearcircuits

"This is a 16 cell gate and pattern generator using cellular automata rules 90 & 150. It will run thru a process driven by a clock signal and requires a signal on one of the seed inputs (anything crossing 1V) to start a new process or alter the current one.
A process without seeds may run for hours or minutes, depending upon the start point and clock rate.

There are 3 CV outputs, two based on what is happening on each half of the circuit, one reflects the pattern created by the active cells. Each cell has a gate output.

The circuit uses CMOS chips and op amps, no microprocessors. It is a big build!

PCB set = USD25
panel = USD23

assembled = USD280"

nonlinearcircuits Null A & friends

Published on Jun 27, 2019 cirtcele

"Not really a demo. I was testing a Null-A built for a customer and ended up with a fun patch. Added in a Doof, Badum Tiss and Resonate for persussive sounds. All gates and CVs from the Null-A"

nonlinear Dispersion Delay 2

Published on May 27, 2019 cirtcele

via nonlinearcircuits

"This module is based on ideas suggested by Lucas Abela.

It is three vactrol based bandpass filters in parallel, each filter is fed into a voltage controlled delay stage. The outputs are available individually or there is an OUT ALL where all 3 signals are mixed.

Me being me designed the delays to go into stutter/zipper/breakdown territory to create the usual noise I love. If desired the delays can be built to remain in their normal operating regions.

PCB set = USD25
Panel = USD26
Assembled = USD260

build info coming soon"

nonlinearcircuits Bi-di Choppers

Published on Apr 29, 2019 cirtcele

"Dual delta modulators that can be used as 2 into 1 or 1 into 2 CV controlled switches. The signals passing thru control the switching.....things can get out of hand."

nonlinearcircuits 1/n - 1 divided by n

Published on Apr 29, 2019 cirtcele

"1/n - can be patch-programmed to divide by 3-9, or match if you add another module. The other outputs will be at different phases to the 1/n out. Or use it to process audio. Jam and preset inputs let you create absolute mayhem."

nonlinearcircuits DelayNoMore3 - proto-type

Published on Apr 29, 2019 cirtcele

"Triple version of DelayNoMore (proto-type), can also be used as 3 individual CV controlled delay modules"

nonlinearcircuits Feague QUO VCF

Published on Apr 21, 2019 Ze Ka


Published on Nov 18, 2016 cirtcele

Note this module is from 2016.

"The Feague is a 4 pole VCF and quadrature oscillator with 0, 90, 180 & 270 degree outputs. It is based on the design in electronotes 41.

It features a lo/hi switch to run it at audio rates or LFO rates, plus a nonlinear Q pot which makes for interesting behaviour when using as a VCF.

When using as a QUO, the nonlinQ pot is used to increase the amplitude of the output signal, which is known to shrink somewhat at low frequencies in these kind of oscillators.

Specs

HP: 10

Inputs

SIGNAL: audio input
CV: for controlling cutoff in VCF or frequence in LFO/VCO
SYNC: sync in/freeze/hold control
1V/OCT: for controlling cutoff in VCF or frequence in LFO/VCO

Outputs

Each ouputs are 90 degrees in out of phase : 0, 90, 190 and 270.

In VCF, the two outputs closest to the side edge of the panel are low-pass outputs, and the other two are band-pass."

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nonlinearcircuits I can't believe it's not a VCO

Published on Apr 10, 2019 cirtcele

"VCO/VCF based on concepts presented in Electronotes #132."

via nonlinearcircuits

"PCB set = USD20
panel = USD20
assembled = USD180

This module is based on ideas presented in Electronotes #132. It is a VCF with a 'filter exciter' section to allow a wide variety of acoustic, semi-acoustic and not-acoustic-at-all sounds. In a sense it takes the concept of pinging the LPG or ringing a VCF one step (or 2) further. The decaying sound is fed back into the input via a VCA. The VCA can be controlled by a gate or an envelope (or both).
Another interesting point is higher frequency sounds tend to be louder.....which is what happens naturally in the big room."

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