Wednesday, 16 August 2017

Wagernumb - NLC - Build notes

These are my build notes for the Wagernumb.
It's a nonlinearcircuits module in Eurorack format.
Looks to be quite versatile. Andrew's build notes describe it as 3 or 4 modules in one:
+ Frequency Tracker
+ Frequency / Clock divider - down to 1/4096
+ VCO
+ Random or Burst generator.


Links
 +The NLC build notes are here:
   http://www.sdiy.org/pinky/data/wangernumb_build&BOM.pdf 
+ NLC blog



Tuesday, 15 August 2017

Feague - NLC - Build notes

These are my build noted for the Nonlinearcircuits Feague module.
It's a 4 pole filter and Quadrature oscillator in Eurorack format.

Andrew's build notes are here:
http://www.sdiy.org/pinky/data/FEAGUEbuild&BOM.pdf

A Quadrature oscillator is a phase shift oscillator.
 It uses an op amp integrator to obtain a full 90° phase shift.

 Here is a simplified circuit to demonstrate the principle.

The virgin PCB:

Get those ICs on first.
Trannies on next:

Some NLC words of wisdom:
Monday Morning Gunk.

Resistor RL - for LEDs. I'm using 470R.
Resistors marked with a "C" = 100K

To be continued ... waiting for parts.

Links:
+ NLC Build notes
+ NLC Blog



Thursday, 10 August 2017

Roland TR - 727

Some pics of the modded 727.

This is the sister of the Roland 707. Its sounds are completely different.
This came out in 1985. That display lets you see exactly what you are doing.

You wont find your expected Kicks and claps here.
Its very unusual sounds are a welcome addition to the standard ones you find on drum machines these days.Great for tribal, Indian & Latin beats. There are 15 digital, sample based (12 bit) sounds.
Though I don't think it has the punch of the TR-626 or 505 which have (almost?) all the same sounds (I think it has the sounds of the 707 & 727). With the 626 you can adjust the pitch of each individual sound.

I love the built in mixer which allows you to adjust the volume of each sound. And the matrix sequencer display makes programming it a breeze. 64 patterns.

 This version has some yummy mods. The standard effects are Shuffle & Flam.
With lots of efx this machine can do wonders. You would be surprised how a little reverb or distortion completely changes the sound of this machine.

The layout is the same as the 707.

Aphex Twin, Freddy Fresh, and Luke Vibert have used the TR-727.
Though the PCM wave samples are all digital, the envelope and VCA is analog.
This is something that the new TR-8 doesn't have. The TR-8 uses "Roland's analog circuit behavior technology"

There are individual outputs for each sound and there is full midi (in/out) & Dinsync implementation so you can use your old TB 303 and modern Midi drums with this. Even if you didn't care for the sounds its so useful just for the DYN-Sync to Midi converter capability.


As mentioned earlier, my 727 is modified.

Its a unique example of circuit bending using banana cables.
A post shared by jono (@dj_jondent) on
It produces unusual sounds.
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For more info on the history of Roland Drum Machines click here

Burma - U-Bein Bridge - travel pics

This bridge spans the Taungthaman Lake near Amarapura in Myanmar.

 The bridge was built from wood reclaimed from the former royal palace in Inwa.

 It features 1,086 pillars that stretch out of the water, some of which have been replaced with concrete.

 construction began in 1849.
 The teak posts were hammered into the lake bed 7 feet deep.

 The 1.2-kilometre (0.75 mi) bridge is believed to be the oldest and longest teakwood bridge in the world.

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For more travel postcards click here:

Tuesday, 1 August 2017

8 Bit Cipher - NLC - Build notes.

These are my build notes for the NLC cipher Eurorack module.


sOME NLC words of wisdom:

ICs first.
Now for the through hole stuff:
Headers to join the 2 PCBs.
Install the Jacks & LEDs


Links:
- NLC build notes
- NLC blog 
- NLC panel - CMOS (Serge format) 
- jondent blog - The cipher section of the serge/CMOS panel 

..

Works well with Buchla.
.

The upper 9 jacks are trigger outs.
000 to 111 are binary for 0 to 7.
Super serial = ??? Its another trigger out.
CV1 to CV4 are outputs.
The CV outputs are all related to each other but are all different; part of CV1 is fed to CV2, part of CV2 is fed to CV3 etc.
 
The lower row are all inputs.

"The strobe input makes it a bit like an 8 bit sample and hold.
If nothing is inserted into the strobe jack the module carries on as normal. When a signal is introduced to strobe, the data obtained from the data jack is only loaded onto the outputs when the signal is high. "
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You can find more NLC builds here.
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