Wednesday, 1 April 2020
248r expander
Some build pics.
CD 4051
HC595
Waiting for some parts.
To be continued ......................
Monday, 30 March 2020
Making the Lyra panel
These weren't made by me.
However, you can make them yourself.The .brd files are here:
Cheers J
Links
+ Lyra 8 build - part 1
+ Lyra 8 Part 2
+ Lyra 8 Part 3 is here
+ Making the Lyra Panel face plate
Saturday, 21 March 2020
ARP index
This is my blog index for all things ARP
I'll try to keep this updated.
You can always find the link to this page on the right of the blog home page.. Under "Blog Index"
ARP 2500
1003 Dual Envelope Generator
+ Envelope Generators
+ ARP 2500 - 1046 envelope generator & eloquencer
+ Arp 2500 - 1003, 1033, 1046 envelope generators
1023 - VCO
+ VCO 1023 Module tests
+ Filter bubbles
+ ARP 2500 - first patch
1033 - Envelope Generator
+ Arp 2500 - 1003, 1033, 1046 envelope generators
1036 - Sample & Hold
+ SAMPLE & HOLD / RANDOM VOLTAGE (1036 module)
+ Sample & Hold (videos 1 and 2)
1050 - Mixer Sequencer
+ 1050 Mixer sequencer - Build notes
+ ARP 2500 - first patch
+ ARP 2500 - Patch 3
ARP 2500 Keyboard
ARP 2600
TTSH
General Misc
Sync the ARP 2500
Master or slave?
ARP as the master .
It sends a 8V clock.
The 1027 sequencer also outputs 10V pulses from the "position gates"
As a master its easy. esp with a modular synth like the TTSH or a 2600
This also works quite well with my eurorack.
Use the clock out.
It's a 8V pulse per step.
ARP as a slave.
I'm again using the ARPs clocked sequential module ... the 1027 .
It's a 10 position sequencer.
The step input.
Electrical specs:
According to the manual, the perfect input for step, repeat, on & off is +8.0V.
The 1027 sequencer however, outputs 10V pulses from the "position gates"
and the manual suggests connection the "s" input to the "position gates" ... so I think 10V pulses should be safe to use.
Another way to sequence the sequencer is via the "VC frequency".
... this controls the clock frequency
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I've found 3 methods that work.
The first two use a clock signal that triggers the step input on the 2500.
So the ARP 2500 is the slave.
The first uses a Kenton Pro solo Mark 2
I used a Deluge as the master Midi module ... sending midi clock to the Pro solo.
The settings are as follows:
This also works for Buchla.
Method 2
Elektron Analog Keys.
The A4 should work the same.
Go into your global settings and set CV C or CV D to Clock.
If you only have a standard mono cable use CV C as this sends the clock to the tip.
(CV D sends it to the ring)
tHE length of the pluse can vary. My 2500 responds well to 24ms length, but its also ok up to 32.
8V pulses work fine. Probably 10V will be ok ??
Set the clock control to trigger.
tHE third method was using a roland SH 101
tHE "gate out" voltages are perfect.
Friday, 20 March 2020
NLC Dual LFO / VCO
These are my build notes for the nonlinearcircuits Dual LFO/VCO module.
Its Eurorack format.
These are the virgin PCBs
icS first
I'm waiting on some parts.
The LM13700 is a general purpose op-amp.
The DG202 is a CMOS switch. Its a quad SPST switch.
The DG 212 should also be ok to use.
The "DG " stands for double gate.
Double Gate CMOS (DG)
Traditional CMOS technology is approaching physicial limitations was we approach the nanoscale regime.
One such solution is the double gate transistor, proposed in the 1980s.
"Multigate transistors are one of the several strategies being developed by CMOS semiconductor manufacturers to create ever-smaller microprocessors and memory cells, colloquially referred to as extending Moore's law."
the 3mm LEDs are bipolar. They are 2 pin.
to be continued...............
Part 2 is here:
NLC Dual LFO/VCO - part 2
Links
+ NLC Wiki
+ NLC Build guide and BOM
+ NLC Blog (old)
+ NLC blog (new)
+ CMOS info
+ NLC DIY info
--------------------------------------------------------------------------------------------------- Click here to return to the NLC Build Index:
http://djjondent.blogspot.com.au/2015/03/non-linear-circuits-ncl-index.html
The algorave movement
It's a combination of 2 words .... Algorithm & Rave.
"An algorave is an event where people dance to music generated from algorithms, often using live coding techniques.Algoraves can include a range of styles, including a complex form of minimal techno, and the movement has been described as a meeting point of hacker philosophy, geek culture, and clubbing.
Although algorave musicians have been compared with DJs, they are in fact live musicians or improvisers, creating music live, usually by writing or modifying code, rather than mixing recorded music."
(Wikipedia)
Basically, artists code live on computers.
The code produces music and controls visuals.
The visuals usually include the code itself, so the audience can see the music as it evolves and is written.
The software is free & opensource. Much of it will run on really basic computers (eg a raspberry pi ) making this form of music easily accessible to everyone.
Their logo is a Spirangle.
It's a cross between a triangle & a spiral.
Currently, there is live performance of artists coding and performing all around the world.
It's taking place today, March 20.
This is also known as the March Equinox ... actually it occured a 2.49pm in Australia.
This marks the arrival of Spring in the Northern Hemisphere & Autumn in the Southern.
The coding festival is called Eulerroom Equinox
http://equinox.eulerroom.com/schedule.html
They also have a facebook page
Check out my page on Sonic Pi
It's a great tool to get you stared on coding.
TidalCycles is also a great resource for music coding.
as is Gibber
Hydra is a good place to start learning to code visuals
Thursday, 19 March 2020
OPTIGAN ios app
(only 1 week)
You can download it from the Apple app store
https://apps.apple.com/us/app/ioptigan/id1143470101#?platform=ipad
It's an optical organ ... or a chord organ from the 1970s.
It was sold by Mattel.
Author PMDrive1061
Very lo-fi, but I like it.
Used optical discs to sample prerecorded music.
This reminds me of the Soviet ANS synthesizer
https://en.wikipedia.org/wiki/ANS_synthesizer
Cool samples
Other synths on the same lines that uses optical discs are the Panoptigon from Quilter Labs.
https://www.youtube.com/watch?v=sX0yEojVHhE
and
The Vako Orchestron
Kraftwerk made heavy use of the Orchestron on their albums Radio-Activity (1975), Trans Europe Express (1977) and The Man-Machine (1978).
There were only about 70 to 100 Orchestron's made
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Links
https://optigan.com/
https://www.ioptigan.com/









































