Eurorack Modular J3RK Mirror Core VCO in PLL configuration (sort of...)

Published on May 5, 2014 encrust1

Watch your volume levels on this one.

"Just a bit of fun...

My newly constructed J3RK Mirror Core VCO kit from Synthcube. (Not quite finished - a switch needs wiring in and a knob adding.)

The only external module doing anything relevant is a Doepfer LFO.

The left side VCO is producing a reference frequency which the right side should lock to - although this frequency is very low for much of the video. This would be a classic PLL (with divider on the right VCO output, phase comparator XOR gate, and integrator controlling the right VCO voltage input) except that the Lockhart folder is inserted in the PLL loop. This is configured as VCA + single fold. The control voltage for the VCA comes from the external LFO.

The result is that the loop never really 'locks' but meanders around a few attractors which are heavily based on the left VCO frequency. The video camera doesn't capture it well, but this set up produces a lot of bass at times.

I also have the FM input of the left VCO controlled by a second phase comparator output.

I am looking forward to completing the module and getting it into my main rack with filters.

Sorry for the shaky video."

Korg SQ-1 to J3RK Stroh Synthesizer

Published on Mar 25, 2018 Ritchie DeCarlo

"Experimenting"

ANGLE - TRAPPIST-1

ANGLE - TRAPPIST-1 from Angle on Vimeo.

ANGLE - TRAPPIST-1

VCO: Tiptop Audio - Z3000, Endorphin.es - Furthrrrr Generator, Buchla/Verbos - 258J, J3RK - Mirror Core VCO, Neutron Sound - Orgone Accumulator.

LFO: Tiptop Audio - Z3000, Random Source - Serge DSG.

VCF: Tiptop Audio - Z2040, AJH - MiniMod VCF, STG - LPF, Random Source - Serge VCFS, Malekko - Dual Borg

ADSR: Tiptop Audio Z4000, Intellijel - dual adsr, Frequency Central - System X Envelope, AJH - MiniMod DCG.

VCA: L-1 - Quad VCA, AJH - MiniMod VCA.

WAVE FOLDER: Toppobrillo - Triple Wave Folder

SEQUENCER: Tiptop Audio - Circadian Rhythms, Tiptop Audio - Z8000

SAMPLER: Tiptop Audio - ONE

QUANTIZER: Tiptop Audio - QuantiZer

EFFECTS: Tiptop Audio - ZDSP

Batchas presents: Buchla Modular - Patch 044

Published on Dec 31, 2016 batchas

Patch driven by Pendulum/Ratchet.
Sound = 259e, 258v, 258j.

Batchas presents: Buchla Modular - Patch 042 & 07

Published on Dec 11, 2016 batchas

"Based on Buchla 288v + some abrasive FM from 258j.

Arpeg. bell sounds come from computer."

The the 288v is from Verbos, and the 258j is from J3Rk. The letter after the number in Buchla format modules usually indicates the maker. The e in Buchla 200e modules is either Don Buchla or BEMI.

9 12 16 Buchla Modular - 07

Published on Dec 11, 2016

"Patch based on 288v (known for LoFi and noisy character)."

Mexico City Velocity with TrapKat & STROH J3RK Synth box

Published on Nov 22, 2014 Ritchie DeCarlo

"Just having fun...."

Buchla Clone Full Voice Synth

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"To be clear these are clones and not originals but are close to the original as you can get. These are built by some of the best DIY module builders out today. They all work flawlessly and sound and function just like the originals. Everything is in near perfect shape.
Here's what comes in the sale:
200e - 6 space powered boat
258c
158d
291j
292c
281r
165d
15 assorted pomona cables"

CLICK FOR MORE »

Buchla - Dual Oscillator 258j FM [Part 3]

Published on Aug 30, 2014 batchas

"Self-modulation on 258j DIY project.

Bottom oscillator: I modified it to get different waveforms to choose from via DIP switch at the back of the module. These waveforms are all shapeable to squarewave.

Top oscillator: square, triangle, sine-to-saw."

All parts here.

Buchla 258j - FM [Excerpts 1]

Published on Aug 18, 2014 batchas

"Self-modulation on 258j DIY project.

I modified it to get different waveforms (shapeable to squarewave) to choose from via DIP switch at the back of the module."

Buchla 258j - FM [Excerpts 2]


Buchla - Dual Oscillator 258j FM [Part 3]

Published on Aug 30, 2014 batchas

"Self-modulation on 258j DIY project.

Bottom oscillator: I modified it to get different waveforms to choose from via DIP switch at the back of the module. These waveforms are all shapeable to squarewave.

Top oscillator: square, triangle, sine-to-saw."

Bowed strings with 258

Published on May 10, 2014 radiokoala·36 videos

"cello/violin sounding patch and short demo of microbrute as a cv-gate controlling keyboard. all sound from 258 vco, microbrute lfo is patched to waveshape & env is modulating x-fade (vco outs tri/saw), and amplitude/ pitch but in subtler amount."

Pink Floyd - On The Run - with a Modular

Published on Jan 3, 2014 Patch Rubin·1 video

"my studio has been packed away for a bit, i thought remaking this Floyd track would be a good exercise to help me remember how this stuff works.

everything is self generating out of the modular. theres a maestro echoplex 4 in there as well.

http://patchdub.com
http://patchdub.bandcamp.com
https://soundcloud.com/patchdub"

"All diy modules, klee, motm, oakley, yusynth, mattson, j3rk. there is a maestro echoplex 4 in there as well."

Buchla 285e 296e

Published on Nov 5, 2013 DrOctave1·270 videos

"using the 258j as a sound source for kick and synth line 266e is the noise source. processed threw the 285e then into the 296e."

New Sponsor Shout Out! - THONK & Announcing The New 258J Analog Oscillator

I just wanted to give a shout out to a relatively new sponsor of the site, THONK! You might have noticed their banner on the right in the Manufactuers section. They offer DIY panels, PCBs, kits, knobs and lots more. Be sure to check out their website to see what they have to offer. They just announced the 258J Analog Oscillator as the first part of this year's limited edition 'J3RK PROJ3KT 2013' series. THONK is also a sponsor of the Tokyo Festival of Modular posted earlier.

BUchla 258x2

BUchla 258x2 1

Published on Apr 30, 2013 opsysbug·129 videos

"Fooling around with Buchla 258J and 258B. A four way FM causes total chaos!"

Buchla 258 x2 noise

Published on Apr 30, 2013 opsysbug·129 videos

"Another with Buchla clones 258J vs. 258b. 4 way FM taking advantage of "extreme FM"
on 258b. Terrible noise. Yes."

Buchla 258x2 + 292+ 294

Published on Apr 30, 2013

"Third video of the 258j and 258b playing together 4 way FM! Thistime added 292r and
Djangosfire 294 clones for a little beat! Let's rock!"

Like an engine!

J3rk bananasynth goes nutty

Published on Mar 21, 2013

"Banana blue J3rk hand made synthesizer. Goes nutty once."

J3rk Banana Blue synthesizer goes nutty 2
Published on Mar 21, 2013

"J3rk hand made blueface banana. Do you like it?"

Buchla 258 in Moog / Synthesizers.com Format

via Roman

Mark Verbos schematics, PCB by J3RK.

Click the pics for the full size shots.