Optotronics Pre-soldered Mini-Eurorack System

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A post shared by Ewa Justka (@ewajustka_official)

  This one in via brian comnes.

  Details below.

Ewa Justka Optotronics DIY Euorack System

video upload by e j

"some example of patches.
(listen on headphones)"

Ewa Justka Optotronics Royal Flanger (Delux)

video upload by e j

"I present to you REAL ANALOGUE stereo flanger based on two BBDs.
(also available in mono).

Stereo (delux) version contains:
-two LFOS for clocking BBD (Flanger pitch modulation)
-two separate CV input (deactivate LFOs) for external pitch control (eurorack compatible)
- CV amount knobs (which also control the pitch)
LFOs:
-'manual 'knobs - range of the flanger
-'rate' of the lfo
- sweep - depth

-FDBK knobs (feedback amount) - capable of extreme feedback!! (maximum self oscillation)

- two mono jacks in and out (for stereo version) - 6.35 mm
- two CV jacks - 3.5 mm

available in variety of vintage royal tins, on my etsy store: https://www.etsy.com/uk/shop/Optotronics

Runs on 9VDC+ (not included)."

test10

video upload by e j

"testing, testing"

Update: Optotronics Synth DIY Eurorack System:



Update2:

"These are raw recordings of my new eurorack system. The boards' layout and panels were designed by me. All of the modules were based on quite standard designs: diode ladder VCFs, CEM VCOs, OTA VCAs, basic LFOs, discrete envelopes and single PT2 delay.

CV was generated by Korg SQ1 and Instruo's Harmonaig.

I kept modules quite simple, as the system was made specifically for future workshops and DIY kits (soon available via etsy shop)

The system will be keep growing in new modules!

credits

released August 28, 2021"

more

ewa justka VOICE ODDER 2

e j

"WHAT IS IT?

- a synth based on PT2399 delay IC and 40106 2 light sensitive square wave oscillators
- two inputs: mic and oscillators, you can choose which input goes through the delay unit (PT2399)
- you can purchase either DIY kit (all parts included except for the battery) version with detailed instructions OR finished product.
- runs o 9v

“The word is now a virus. The flu virus may have once been a healthy lung cell. It is now a parasitic organism that invades and damages the central nervous system. Modern man has lost the option of silence. Try halting sub-vocal speech. Try to achieve even ten seconds of inner silence. You will encounter a resisting organism that forces you to talk. That organism is the word.” – William S. Burroughs, The Ticket That Exploded"

https://www.etsy.com/uk/listing/744423665/voice-odder-2

This one is in via brian comnes: "new version, with a panelyou can purchase.." via https://ewajustka.tumblr.com...

You can find additional posts featuring Ewa Justka's work here.

Ewa Justka - HELLO? STELLA? ARTOIS...? ARTAUD?

e j

Editions Mego @ 2020
album: Upside-down Smile

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See the Ewa Justka label below for more.

Ewa Justka's Ladder to Hell

Ladder to Hell DEMO Published on Dec 27, 2019 e j

This one in via brian comnes.

"Laddder to Hell is a celebration of resonance !!
based on Moog resonance filter - TRANSISTOR LADDER -
- OCD distortion (modified) http://3.bp.blogspot.com/-57B7rhhMBg8... [and below]

and ORIGINAL WASP filter : http://www.modular.fonik.de/pix/F_was... [and below]
(high and low pass)

AND Moog Lm 13700 filter http://musicfromouterspace.com/analog... [and below]
(also high and low pass)

audio input
CV for Moog resonance
and Wasp resonance

// i the demo i'm using TR09; TB03, vermona kickdrum and korg sequencer sq1//

you can purchase it here: https://www.etsy.com/uk/listing/76545..."

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optotronic duet

Published on Jan 14, 2019 Brian Comnes

"Ewa Justka's Optotronics Motherfucker2 paired with her Triangle synth. - The triangle's trigger out is driving the MF2 after a few minutes. and for a brief time the MF2 is pushed into a Schlappi Angle Grinder ....Not a performance piece, merely an exploration of some of the sounds these two friends can make together....enjoy"

Check out Ewa Justka live here.

Some info on the triangle sequencer via etsy:

"Triangle △ synth is 8-step trigger sequencer based on CMOS chips.

it features 8 push button switches for changing the pattern , toggle switch for changing the range of the pitch, 3 knobs: tempo of the clock, pitch, glide. and two outputs: audio and trigger out.

It can play odd, complex patterns, from glitchy unpredictable strangeness to more organised bangers.

tuns on 9V battery which is not included.
needs audio mono mini jacks.

audio recordings here:"

Ewa Justka live @ Cafe Oto, London, 09/09/15

Published on Sep 22, 2015 e j

hand made drum machine, sequencer, voice odder
modified crt
cfl bulb

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Ewa Justka of Optotronics.

Scramble Everything - Pitch Scrambling Effect from Optotronics

Published on Apr 21, 2018 e j

From the makers of Oi, Kant!

"purchase here: https://www.etsy.com/uk/listing/59534...

Scramble Everything is a strange little synthesiser: both sound generator (it generates random sequences) and an effects unit, a pitch shifter.

The scramble suit in ‘Scanner Darkly’ was “an invention of the Bell laboratories, conjured up by accident by an employee named S. A. Powers... Basically, his design consisted of a multifaceted quartz lens hooked up to a million and a half physiognomic fraction-representations of various people: men and women, children, with every variant encoded and then projected outward in all directions equally onto a superthin shroudlike membrane large enough to fit around an average human. In any case, the wearer of a scramble suit was Everyman and in every combination (up to combinations of a million and a half sub-bits) during the course of each hour. Hence, any description of him - or her - was meaningless.”

Scramble Everything is the scramble suit of synthesisers. Whatever source you use on the input, the output will be completely scrambled, human and non-human speech-like sounds.
The main star of Scramble Everything is the pitch filter effect unit based on robotic voice modulator IC – HT8950 – which can be used either together with the internal random sequencer, or as a standalone effects unit. You can then, following Philip K. Dick, use any input source and scramble the shit out of it. Does the output still contain remains of the original sound? If you want to jump between two realities you can use the special slider that will easily transport you to the other side. Spooky! Can it get more sci-fi? Yes. The filter’s frequency not only can be controlled with the knob, but also with the light. Scramble Everything contains an RGB light source, and its colour sequence (controlled by the internal random sequencer) changes the tone of the filter. The scramble tone then depends on the intensity of each colour (red, green and blue). Additionally Scramble Everything contains three switches for each colour, so you can decide if you want to have smooth or abrupt transitions between the colours.
You can also control the amount of slide between the steps, switch from staccato to legato and vice-versa, control the pitch of the sequencer and its frequency range.
You can also use the random trigger output to trigger external sound sources.

If you want to know more about scrambled realities, please have a look at the Scramble Reading Pack here:
https://www.dropbox.com/s/0gbiwvc7agw...

Scramble Everything runs on either 9 or 12V power supply, 600mA minimum. You can also use a 9V battery.
It has 5.5mm x 2.1mm power barrel (center negative): https://i.ebayimg.com/images/g/czUAAO...

Scramble Everything was designed by Ewa Justka. Some of the conceptual framework of the machine is a result of a collaboration between Ewa Justka and Roc Jiménez de Cisneros."

NEW SYNTH: THE SEQUENCING MACHINE by EWA JUSTKA

Published on Feb 21, 2017 e j

"The Sequencing Machine is a pseudo modular diy synthesiser.
Depending on the patch you make you can create different sequences.
This simple yet versatile synth is capable of producing a wide range of weird sounds from watery, noisy rhythms to 8-bit melodies.

get more info and purchase it here: https://www.etsy.com/uk/listing/50031..."

Ewa Justka MF2 Videos

Published on Dec 8, 2016

First five videos are by Brian Comnes, last video is by Ewa Justka, the maker of the MF2. MF does stand for what you think.

Playlist:
Ewa justka MF2 trial run
Ewa justka MF2 trial run
MF2 demo 3 with simple easel sequence
MF2 demo 4 with Pocket Operator Rhythm and FrostWave Resonator
MF2 DEMO 5 with Bastl BitRanger
MF2 DIY Delay/Reverb with built in VCO

http://ewajustka.tumblr.com/?soc_src=mail&soc_trk=ma

The MF2 is super versatile audio synth or effect pedal, perfect for noise musicians as well doomcore lovers AS WELL AS FOR NORMAL PEOPLE who play guitars. or sing. not sure what normal people do.

It is a developed version of the MF1 Delay/Reverb pedal

It contains double PT2399 (double delay, double reverb), you can choose how much delay/reverb you want (basically wet/dry) and you can decide if you want to use both delays or one.

It also contains built in VCO with a clock also built in, you can choose if you want to use the internal clock but you can also use an external trigger/cv signal to control vco, which than can be fed into delay units. It also contains noise push button for extra feedback amount."

You can find the MF2 on Etsy here.

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