Thursday, 6 July 2017

NLC PSU build 2

This is a smaller version of a Nonlinearcircuit PSU I built earlier.
http://djjondent.blogspot.com.au/2017/02/power-supply-nlc-build-notes.html

It uses a 12VAC Wall Wart power adapter.
The AC output of the wall wart is rectified with diodes so that positive voltage gets stored on the caps that serve the positive voltage regulator (LM7812) and negative voltage gets stored on the caps that serve the negative voltage regulator (LM7912).

I'm putting together this PSU for an old Serge modular but its actually for Eurorack.
The serge uses +12, -12, +6 and ground so I will have to add a 6V regulator to this later.

Some pics:


The PCB receives 12VAC from a plugpack/ wallwart
. The 1N4004 diodes split this into positive and negative waveforms.

The 4700uF capacitors then smooth out these waves
. The 7812 and 7912 regulators then convert the rectified & smoothed
signals to +12V DC and -12V DC and these are fed to the connectors to be distributed to your lovely modules.
I'm using 250v TDK film caps for the four small 100nf caps

 Poor Grandma.
Let's Eat Grandma is a British musical group formed in 2013 by childhood friends Rosa Walton and Jenny Hollingworth. 

I decided to use 1K resistors for the LEDs

 Some pics of the additional 6V regulator circuit.
 Using a LM7806
 330nf on the left. 100nf on the right.


Red +12V, Black 0V, White -12V, Green +6V

----------------------
A second build.
I have a very confined case.
 tRYING TO keep everything as flat as possible.



Wednesday, 5 July 2017

Hsinbyume Pagoda - Myanmar (Burma)

This beautiful all white structure on the banks of the Irrawaddy river just North of Mandalay.

 The pagoda that is also known as the Mya Theindan Pagoda.It is located in the Northern part of Mingun town near the massive Mingun Pagoda.


 The all white pagoda was built in 1816 by Prince Bagyidaw.



The structure was dedicated to his first wife, Princess Hsinbyume, which literally translates to White Elephant Princess, who died during child birth. During the large earthquake of 1838 the Hsinbyume Pagoda was severely damaged.





Sunday, 2 July 2017

Paperface Serge - Negative Slew restoration

Serge  Negative Slew restoration.
These are some notes for repairing a old Negative Slew.


The main panel is here
http://djjondent.blogspot.com.au/2017/06/serge-paperface-restoration-warren-burt.html 

The board is marked R9
This is the lower section of the PCB.
The upper section works.
According to Ken Stone's site there are two problems with this.
It's missing one trace and a 4.7k resistor.
I've marked the missing trace in orange.

Also marked the missing 4.7k resistor in orange.

4.7K resistor added.
I removed the 3900 opamp. lots of corrosion in the socket.
Replaced & it works.
:-)
Thanks Ken



Links:
2. CGS
3. Muffs
The 1973 PCB used +12, +6, -12 & ground.
The 1975 PCB used +/-12 V & ground.
So I'm guessing this is a 1975 PCB  as it uses +/-12 & 0V unless it has a on board 6V regulator.

The module uses two ICs
LM3900. It's a quad op amp

 Ground at pin 7, power is pin 14.

LM3046 
This is a transistor array.
It consists of five general purpose silicon NPN transistors. Two of the transistors are internally connected to form a differentially-connected pair.  



PCB connections:
A = input (1)
B = output (1)
C = VC (1)
D = pulse out (1)
E = input (2)
F = output (2)
G = VC (2)
H = pulse out (2)
U = not used (0v)
W = 0v
X = +12v
Y = +6v
Z = -12v




Saturday, 1 July 2017

Eloquencer - master track length

 This can be accessed by pressing Function & the clock button.
 



The Master track length changes the reset point of the pattern when master track is set to INT'.
 

The default is 16
 
 
It has a  max of 64 steps. 
This is not to be confused with making longer sequences.
 
 If I want to extend the length of my sequences to 32 I just need to chain two 16-step patterns. 
If I want to make a 64 step sequence, just chain four 16 step patterns
 
 To explain better what the Master Track Length really is I'll quote something I read in
 the WM forum

"Let's say I chain A1 and A2, MT is INT, and MTL is 16. When I press play the Eloq would play 16 steps in A1 and then will reset, so it will jump to the next pattern (A2). It would play 16 steps in A2 and will to jump to A1 again.  A1-A2 > A1-A2

If I set the configuration where MTL is 32, Eloq will play 32 steps in A1 and 32 steps in A2, so that would be like playing A1-A1-A2-A2 > A1-A1-A2-A2"
(Winter modular forum) 

 So in other words, making the master length to 32 will make the pattern repeat.


Friday, 30 June 2017

Eloquencer Sequencer - Notes - SONG structure

This are some personal notes for getting aquainted with your new Eloquencer sequencer.

The structure
The eloquencer's method of storing patterns and creating songs seems a bit confusing at first glance.

The thing to remember is that the "project" is at the top level of the system structure.
You can create up to 128 projects.
I like to view each project as something special I create for a particular gig.

Every Project is made up of songs.
Songs are made up of parts
Parts are made up of patterns.
Every pattern is made up of a max of 16 steps.

I think the best way to work with the Eloquencer is to start  at the most
basic level and make PATTERNS.
Then chain the patterns to make PARTs.
Then chain the PARTS to make SONGS.

Once you have enough songs for your gig, store then into a project.

----------------------------------------------------------------------------------------------------

Each project contains 4 banks of 64 patterns.
Thus one project can have 64 x 4 = 256 patterns.
Each bank can be accessed while in Pattern mode by pressing the first 4 Track buttons.
A,B,C,D.
Then press one of the the 16 step buttons
 
A pattern is made up of 8 tracks.

How these  patterns are grouped and chained is how you make a song for live performance..
and each of these songs are stored with other songs within a project.

These patterns can be joined or chained to make "PARTS".
(The parts have a max number of 16 patterns
These patterns can be any of the 64 patterns that are stored within that project).

You can join these "Parts" to make a "Song".
 A Song is a sequence of Parts with a maximum length of 256 Parts



---------------------------------------------------------------------------

So when you begin, you can assess your patterns, in Pattern mode.

You go to Pattern Mode by
1. Holding down Function & long press the Pattern button.


2. you navigate between the 4 banks of 16  with the top 4 track buttons
and the 16 step buttons.
3. add your new pattern by pressing an unlit step button then
    entering your notes.
4. save.
 

 
 
Saving is done in Project Mode
 

 

 -------------------------------------
 
This is song Mode;
Its here where you create PARTS and SONGs
 

---------------------------------

The CV, GATE , G Length, Ratchet buttons have multiple function.
 
 

 
They change colour if pressed repeately... to indicate probablilty etc etc


Thursday, 29 June 2017

Array - Knight Rider - & initialize PinMode - Arduino

 This is a exercise in Arrays
It makes use of 6 LEDs connected to the pins 2 - 7 on an arduino uno using 220 Ohm resistors.
They are triggered like the lights of "KIT" - the car belonging to the Hoff.

A bit about arrays first.
They are a list or collection of variables that can be accessed via an index number. 
      The word "array" isn't actually used. The symbols [] and {} do the job.
      eg: int myArray[] = {6,21,34,2,1,0,152}; 
      Here we declared an array with 7 values.  Arduino creates 7 places in memory for these values.
 
     We can also just tell the arduino to create 7 memory spots, and then enter the values later :
      int myArray[7];
 
To assign a value to the second spot we use a command like this:
myArray[1] = 21; 
This is the index number.
The first spot always has an index value of 0 (they are zero indexed).
 
Code 1
Link:
 
Such a simple piece of code.
This is a great way of cycling through different lists.
In this example we use the array to choose which LED to light. 
It could just as easily be a menu.
Another way might involve using the "switch case".... will cover in another post
 
 // ******************************************************************************
/* Knight Rider 3
* --------------
*
* This example concentrates on making the visuals fluid.
*
*
* (cleft) 2005 K3, Malmo University
* @author: David Cuartielles
* @hardware: David Cuartielles, Aaron Hallborg
*/
int pinArray[] = {2, 3, 4, 5, 6, 7};
int count = 0;
int timer = 30;
void setup(){
for (count=0;count<6;count++) {
pinMode(pinArray[count], OUTPUT);
}
}
void loop() {
for (count=0;count<5;count++) {
digitalWrite(pinArray[count], HIGH);
delay(timer);
digitalWrite(pinArray[count + 1], HIGH);
delay(timer);
digitalWrite(pinArray[count], LOW);
delay(timer*2);
}
for (count=5;count>0;count--) {
digitalWrite(pinArray[count], HIGH);
delay(timer);
digitalWrite(pinArray[count - 1], HIGH);
delay(timer);
digitalWrite(pinArray[count], LOW);
delay(timer*2);
}
}
// ********************************************************* 
 

 Use 220 ohm resistors.
Cathode of the LEDs connect to gnd.
//88888888888888888888888888888888888
This second bit of code is really useful for setting all your pins
to output mode for example. 
Rather than having to type & initialize each pin as an output.
The section in the void setup is the bit that does it. 
//88888888888888888888888888888888888888888
/*
   Array sketch with for loop()
   an array of 3 LEDs that blink consecutively
*/

// create array of output pins for LEDs
int ledPin[] = {10, 11, 12};

void setup()
{
  //  for loop to set all ledPins to output mode
  for (int index = 0; index < 3; index++)
  {
    // declare LED as output
    pinMode(ledPin[index], OUTPUT);

  } //close for loop()
} // close void setup()

void loop()
{

 // for loop() to blink LEDs consecutively
  for (int i = 0; i < 3; i++)
  {
     // set LEDpins HIGH
    digitalWrite(ledPin[i], HIGH);
    // add 1 second delay
    delay(1000);
    // set LEDpins LOW
    digitalWrite(ledPin[i], LOW);
  } // closing for loop()

} // close void loop() 
 
 
//8888888888888888888888888888888888888888888888888888888888 
 Links
+ https://www.tutorialspoint.com/arduino/arduino_arrays.htm
 
 ---------------------------------
-------------------------------------
 

Tuesday, 27 June 2017

Serge Paperface Restoration - Warren Burt - 2/2

Finally I'm getting around to fixing the Warren Burt Serge Modular.
I think I purchased this synth back in 2013.
http://djjondent.blogspot.com.au/2013/12/the-warren-burt-sergedriscoll.html
Sorry Warren that its taken so long to get started.

This is the second panel from the second box.



    Panel 2 of Box 2:
  • 1 Dual Positive Slew
  • 1 Dual Negative Slew
  • 2 Envelope Generators
  • 1 Triple Bi-directional Router
  • 1 Triple Comparator
  • 1 Schmitt Trigger 

----The power supply for this panel consists of  +12, -12, +6, & ground


---------------------------------------------------------------------------
Schmitt Trigger & Triple Comparator


The Blue wire seems to be ground. (marked as "W" on PCB)
The Green is I think +6V (Marked as "Y" on the PCB)
The PCB is labelled R11 

Below are some extra pics I have from a surplus vintage PCB.
Might be of use.


Links:

---------------------------------------------------------------------

Bi directional router
This is marked as R4 on the PCB.
Links:

 Double check the wiring by looking at what the pads are labeled.
X=+VE
W=0V
Z=-VE

In this case, 
The blue wire at the bottom is -12V
Red is +12V
There is no 0V/GND connection to this module.
-------------------------------------------------------------------------------------
Envelope Generator. We have 2 of these

The boards are I believe 1st generation ... from 1973


Links:

 Double check the wiring by looking at what the pads are labeled.
X=+12V
Y=+ 6V
W=0V


Blue (near the pots is marked W on the PCB) is ground.
Red (X) = +12V
Green (Y on PCB) = ??? My guess is its +6v.


Below are some pics from an extra Envelope Generator PCB. Its marked R7 so 
is possibly also 1st generation, 1973.
This is not part of the Warren Burt pile but it might help me work things out.
Lovely dark blue colour too.





I think this is a voltage divider circuit to create 6V from 12V.

----------------------------------------------------------

Negative slew

Links:
2. CGS
3. Muffs

The 1973 PCB used +12, +6, -12 & ground.
The 1975 PCB used +/-12 V & ground.
So I'm guessing this is a 1975 PCB  as it uses +/-12 & 0V unless it has a on board 6V regulator.

The upper slew was working.
But not the lower. So i needed to trouble shoot this.
-----------------------------------------------------------------------------------
Positive Slew



Links:
2. CGS

This module appears to need +/-12V, +6V & ground
 The PCB is labelled R10.
X= +12V
Y= +6V
W= 0V
Z= -12V