Showing posts with label Eurorack. Show all posts
Showing posts with label Eurorack. Show all posts

Sunday, 8 July 2018

Doepfer 128 - Fixed filter bank modifications

The Doepfer Module A-128 (Fixed Filter Bank) is a filter bank, made up of 15 parallel band pass filters :50 Hz / 75Hz / 110Hz / 150Hz / 220Hz / 350Hz / 500Hz / 750Hz / 1.1kHz / 1.6kHz / 2.2kHz / 3.6kHz / 5.2kHz / 7.5kHz / 11 kHz. 


Each band pass filter has its own amplitude control knob.



The unmodified 128 has just one output which is a mix of all the filters, depending on the position of each one's amplitude control knob. 

It's a lovely sounding filter even though it has no CV control.

It's worth adding an output for each filter.

To do this you must remove the knobs aND faceplate


 Ive made a breakout panel .. 4HP







 You can find some mod instructions on Doepfers own site:
http://www.doepfer.de/service/A128_single_outputs.pdf


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For more Euro DIY builds click here:
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Deluge - Synthstrom Audible

Thanks to Ian from Synthstrom ( and the organisers of New Sound Waves) for this live demo.
Held in Sydney

I'm very tempted to purchase a Deluge.

A post shared by jono (@dj_jondent) on
Some pics:


Ian also brought along one of the early existing Deluges.

It's interesting to see how it it has developed into the current beast.
The Deluge was developed in New Zealand
It's a drum machine, a synth. It integrates with Midi and voltage controlled synths.




Testing the Deluge with some eurorack gear (Metromodular).



Friday, 6 July 2018

Eloquencer - Copy A Track To Another Track In A Different Pattern

 Copy A Track To Another Track In A Different Pattern

We are in edit mode (CV, GATE, GATE LEN, RATCHET) and we have chosen the track we want to copy.

1. Copy (press Function + Copy and hold) 
    The OLED will display "Trak Copy"
2. (While holding) deselect the parameters you don’t want to copy by pressing the relevant green lit edit mode buttons 
3. Release Function + Copy 
4. Go to Pattern Mode (hold Function + Pattern for at least ½ second) 
5. Choose the desired Bank and Pattern (via the Track then Step buttons) 
6. Go to any of the editing modes (CV, Gate, Gate Length, Ratcheting) 
7. Select the desired track you want to paste the track to 
8. Paste (Function + Paste for at least ½)

Saturday, 23 June 2018

Radio Music - Chord Organ - SD card

I had a problem with my whole modular booting up today.
After unplugging many modules, I traced the problem to my Chord Organ module.
This was unusual, as it was working before. 
Initially, I suspected a hardware problem, but it turned out to be a failed SD card.

Interesting that a simple faulty card had caused my whole system to crash.

So this was a good opportunity to refresh the card file
 
The SD card needs to be populated with a simple text file.
Name it CHORDORG.TXT
Place it the root of the SD card


suggestions from James Bernard:

(just copy the 16 lines onto your text file).

1. [0,4,7,12,0] Major
2. [4,7,12,16,-5] Major inv 1
3. [7,12,16,-5,0] Major inv 2
4. [-12,-8,-5,0,4] Major inv 3
5. [-8,-5,0,4,7] Major inv 4
6. [-5,0,4,7,12] Major inv 5
7. [0,4,7,11,0] Major 7th
8. [4,7,11,0,16] Major 7th inv 2
9. [7,11,0,16,19] Major 7th inv 3
10 [-12,-8,-5,-1,0] Major 7th inv 4
11 [-8,-5,-1,0,4] Major 7th inv 5
12 [-8,4,7,11,23] Major 7th no root
13 [0,0,0,0,0] Root
14 [-24,-12,0,12,24] organ
15 [-8,-5,4,7,16] Major no root
16 [-12,0,0,12,24] 2 up 1 down octaves

 

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Note:

+ everything outside the brackets is ignored 
+ Chords are described in numbers:
      0 is the root
     12 is a octave above
    -12 is an octave below.
     Max 16 chords
     Max 8 notes per chord.
Try to give all chords the same number of notes. This reduces "clicks" when a chord is changed.

Another example

1. [0,4,7,12,0] Major
2. [0,3,7,12,0] Minor
3. [0,4,7,11,0] Major 7th
4. [0,3,7,10,0] Minor 7th
5. [0,4,7,11,14] Major 9th
6. [0,4,7,11,14] Major 9th
7. [0,5,7,12,0] suspended 4th
8. [0,7,12,0,7] Power 5th
9. [0,5,12,0,5] Power 4th
10 [0,4,7,8,0] Major 6th
11 [0,3,7,8,0] Minor 6th
12 [0,4,7,10,2] Dominant 9th
13 [0,4,7,10,1] Dominant minor 9th
14 [0,7,9,1,4] Elektra chord
15 [0,8,11,4,9] Farben chord
16 [0,4,7,10,3] Dominant seventh sharp nine / Hendrix chord
 
+ Wikipedia List of Chords page
 
"The column marked “p.c. #s” shows the numbers you need here, in Integer Notation, (with “10” and “11” replaced by “t” and “e”)." (Music thing modular)


Tuesday, 5 June 2018

Diodes - Basic Info

The name diode is derived from “di–ode” which means a device that has two electrodes. 

These belong to the world of "semiconductors". 
Semiconductors are usually broken up into positive or P-type, and negative or N-type. --- this has nothing to do with the poles of a battery. The two types are joined together.

Orientation



A diode is a two-terminal electronic component that conducts current primarily in one direction; it has low resistance in one direction, and high resistance in the other. Wikipedia
They allow current to flow in one direction.
See the arrow.
A PN junction is the simplest form of the semiconductor diode.
 
 
 Semiconductor diodes are the most common type of diode.
 
Different Types of Diodes
  • Small Signal Diode. ...
  • Large Signal Diode. ...
  • Zener Diode. ...
  • Light Emitting Diode (LED) ...
  • Constant Current Diodes. ...
  • Schottky Diode. ...
  • Shockley Diode. ...
  • Step Recovery Diodes. (Snap-off)
  • PN Junction Diodes
  • Tunnel Diode (Esaki)
  • Varactor diode (Varicap)
  • Photo diode
  • PIN diode
  • Lazer diode
  • Avalanche Diode 
  • Vacuum Tube diodes
  • Crystal rectifier (crystal diodes)
  • Gunn Diodes
  • Thermal Diodes
  • Stabistors or Forward Reference Diodes 
  • Gold-doped diodes
  • Super barrier diodes
 Common Diodes you will use are Schottky, LED, Signal, photo and Zener

Schottky Diodes
Very commonly used in Synthesizers.
The main application area of Schottky diodes is in switching power supplies which are intended to work with frequencies over 20kHz.

They are also known as barrier or hot carrier diodes. 
They have their own symbol.

It has a low forward voltage drop and a very fast switching speed.  
The forward voltage drop is substantially less than that of the conventional silicon pn-junction diode. 
 
 
A silicon p–n diode has a typical forward voltage of 0.6 – 1.7 Volts, while the Schottky's forward voltage is 0.15– 0.45 V. This lower forward voltage requirement allows higher switching speeds and better system efficiency.  
 

 
These are all different types of Schottky Diodes







..


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Photo diodes
A photodiode is a PN-junction diode that consumes light energy to produce an electric current.
It's designed to absorb photons.
 They are also called a photo-detector, a light detector, and a photo-sensor. 
Photodiodes are designed to work in reverse bias condition. 
Typical photodiode materials are Silicon, Germanium and Indium gallium arsenide.





In the NLC Lux module, its used to make a "optical thermin".






Links

Sunday, 13 May 2018

Noise Engineering - BIA - Basimilus Iteritas Alter

Some tweaking of this incredible module.

Noise Engineering have made a work of art.
It's much much more than a drum. Fabulous for baselines.

I'm using a Wintermodular eloquencer to sequence the BIA
Sometimes it just sounds so good without any CV sequencing from the eloquencer.
All u need are triggers & gates.

Thursday, 10 May 2018

NLC Resonate - build notes

These are my build notes for the Nonlinearcircuits Resonate module.
It's in the Eurorack Format.


The Resonate Module uses the core circuit of the Korg 3100 Resonator, with component choices for the filter sections as per the mods introduced by RJB in his blog back in 2005.
The  Korg PS3100 is famous for the sound of its resonator.


The main difference of the NLC version is that it has 4 VC bandpass stages and a feedback control, whereas the original has 3 stages and no feedback. The 4 VC bandpass stages can be controlled by a single CV on input 1 (with an attenuator) or individually with each of the 4 CV inputs.
The CV processing sub-circuits are greatly simplified from the original Korg version, simply using op amps to drive the vactrols.
The 2 inputs are summed together. Out 2 is an inverted version of Out 1.

Demo Video - https://youtu.be/VD0j_Nwsv4w

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sOME NLC words of wisdom
Nouveau shamanic - another Nicolas Cage Reference.
Nouveau Shamanic is the name he's given to his personal acting style.
 "thousands of years ago, the tribal shamans were really actors. What they would do is they would act out whatever the issues were with the villagers at that time, they would act it out and try to find the answers or go into a trance or go into another dimension, which is really just the imagination, and try to pull back something that would reflect the concerns of the group."

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Back to the build.
I like to get the ICs on first.
I'm using a new solder:
This is brilliant stuff. It's not cheap, but flows so easily and is only 0.35mm. It's 5 core.
I've up to now been using 0.7mm single core.



tHESE rectifiers are a protection against plugging in the module backwards.

I'm using 1.0 K resistors for the RLs - LED resistors.

I'm using NSL vactrols

The white dot on the vactrol is the cathode.
On the PCB, the cathode is marked "k"
Install the headers which join the two PBCs




Nice.

Links:
NLC Build notes 

https://www.nonlinearcircuits.com/modules/p/resonate
Facebook 
Muffs - 2018 modules

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Zlob - Clock Divider

A great module. Its just 2HP
These aren't official build notes.
The Zlob website is here:
https://zlobmodular.com/clk-d-2/

The build docs are slightly different from my version which I think is currently under revision
 However, it works great.


the 4040 ic must be the type that can run on up to 15V.
The trannies are 2N3904



You need to solder those 5 two pin jumpers, and then connect them with a shunt/shorting block.
This version has these pins for expansion purposes. (With the 16 pin header next to it). I could also solder each of the 2 pins together, if I didn't want the future expander.
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For more Euro DIY builds click here:
http://djjondent.blogspot.com.au/2017/12/diy-index.html
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Tuesday, 8 May 2018

Division6 - Dual Sequencer

Looking for the perfect sequencer is like searching for the Holy Grail
It may never end. There are so many out there.

I thought this was worth a crack.
Fairly compact and cheap to build.
I was impressed with the Div 6 pocket sequencer so whynot.

These are not build notes, just some pics to help me remember the build process if I ever want to do it again. The build is quite easy.
The official notes are here:
http://division-6.com/products/dual-mini-sequencer.php

 Its all through hole. No SMD






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For more Euro DIY builds click here:
http://djjondent.blogspot.com.au/2017/12/diy-index.html
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