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Paperface Serge - Negative Slew restoration

July 2, 2017, 6:15 pm
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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:
1. SergeSynth.net
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




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Hsinbyume Pagoda - Myanmar (Burma)

July 5, 2017, 10:53 pm
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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.





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NLC PSU build 2

July 6, 2017, 1:05 am
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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

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


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Serge Restoration Paperface 2.1

July 6, 2017, 5:56 am
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This is the upper panel from box 2

This contains:
  • Dual Positive Slew
  • Dual Negative Slew
  • 2 Smooth and Stepped Function Generators
  • 1 Dual VC Slew Generator
  • 1 Peak and Trough 
----------------------------------------------------------------

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



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




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 The lower module is the negative slew
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Serge Positive Slew - Paperface - restoration

July 6, 2017, 11:34 pm
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Some pics of the Positive Slew.
This is from panel 2.1 (Warren Burt paperface).

 The red IC socket holds a LM3900 opamp which I swapped.
No improvement though. :-(
The module is powered by -12V (bottom blue), +6V (Green), +12V (Red), 0V (Blue top)

Connecting the lower pulse output to START or SUSTAIN should cause the Positive Slew to operate as a VCO or LFO..




The module uses two OpAmp ICs:
a  LN3900 & a MC 3401

The above pin out is for the MC 3401

It's interesting that both Quad op amps have identical pinouts


Links:
1. Ken Stones CGS - Positive Slew
2. DUSG - CGS 
3. Serge.synth.net

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NLC 32:1 - build notes

July 11, 2017, 10:59 pm
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This is a Driscoll/Warren Burt inspired Eurorack module.
I am lucky to have the original Driscoll module on which this is based
so am keen to compare the two.

 The 32:1 can split 1 input into 32 outputs or vice versa.

Links
* Build notes & BOM
* NLC Blog
* MUFFs
* Youtube






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NLC Plague of Demons

July 12, 2017, 12:12 am
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Eurorack module build notes.

Checkout electronotes EN #75
It's a thru zero VCO that uses analogue switches

Links
* NLC Blog
* Build notes

To be continued


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Shwenandaw Monastery - Mandaly, Burma

July 28, 2017, 4:57 pm
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Shwenandaw Monastery is located near Mandalay Hill, Mandalay Region, Myanmar (formerly Burma).

Its also known as the Golden palace monastery.
  built in 1878 by King Thibaw Min.

The building was originally part of the royal palace at Amarapura, before it was moved to Mandalay

 The building was heavily gilt with gold and adorned with glass mosaic work.

..

This is a section of the ceiling.

This was once covered with gold leaf.

Shwe Nan Daw Kyaung is famous because it is the only palace building which is left from the destruction of WWII. The Royal palace was burnt down in 1945.


For more travel postcards click here:
http://djjondent.blogspot.com.au/2015/03/travel-postcards-index-my-travel.html
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Open Frame 40 - Carriage works gig

July 28, 2017, 5:50 pm
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http://carriageworks.com.au/events/open-frame-room-40/

I attended this gig a month ago. Loved it.
There were 3 artists:
ALESSANDRO CORTINI 
KLARA LEWIS
SARAH DAVACHI

Klara Lewis is Swedish.

She released her debut album Ett in 2014
In that same year she also released an EP, Msuic.


Sara Davachi is Canadian.

A post shared by jono (@dj_jondent) on
I think her instrument was a ARP odyssey.
It was difficult to tell from a distance.
 
Alessandro Cortini needs no introduction.

A member of NIN and a founding member of LA-based electronic band Modwheelmood.
He also recorded as Blindoldfreak (esp. when using his Buchla 200e)
Alessandro is also the front-man for the band SONOIO and a member of the band The Mayfield Four.

The Avanti performance was beautiful and heartfelt especially with the backdrop of those old super 8 family videos shot by his grandfather of a young Cortini playing with a wheelbarrow.
I wish I could have recorded it all ... there were visits to the seaside, pictures of Venice,
a wedding. Very emotional and personal.

I received lots and lots of questions regarding what instruments Alessandro used.
I'm not really sure as I never got close to the stage. But the general consensus seems to be
that the sounds were of a EMS synthi, performed with a 4 track tape recorder.

"'AVANTI’ was written and recorded with an EMS Synthi AKS, but live I perform it with a TASCAM 4 track cassette player. It allows me to add another layer of expression to it, much different from the original creative one, while providing a certain degree of stability that the vintage machine wouldn’t be able to provide….with plenty of room for random and happy mistakes if needed."
(CyclicDefrost)

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Modular in the CarPark - inagurial event - Wollongong

July 28, 2017, 6:53 pm
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Sunday, 16th July, 2017. 
Many thanks to Claude Spinelli & Andrew G for helping put this event together.
We hope to be holding these events every 3-6 months.

The location was Prosound and Lighting, Wollongong.
Address: 16 Flinders St, Wollongong NSW 2500
Phone: (02) 4226 1177


Anyone with a synth, drum machine, etc was welcome to come,watch and perform. The synth didn't have to be modular.

 Keyboards were welcome too. 

The event was free, with sausage sizzles and barista coffee.
A good place to network with electronic musicians in the Sydney/Illawarra area.
l
Lots of great tunes too.

If you would like to perform at the next gig please leave a message here or contact Claude at Pro Sound and Lighting. (02) 4226 1177





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Router - NLC build notes

July 30, 2017, 7:37 pm
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Some build notes for the Nonlinearcircuits router.
I'm hoping this will function something like the Serge bi-directional router, but with 4 outs rather than two.
A router can also be found in the NLC Chopper.

The new NLC Router is a voltage controlled switch that can deliver 1 into 4, 4 into 4 and 4 into 1 at the same time, 2x 2 into 2 and, with a simple mod to the PCB, 2x 1 into 2 



This looks like a easy build.
ICs on first.
..
The module uses a DG412 which is a CMOS analog switch.

Control inputs are pins 1,8,9,16 (in)
D1–D4 : Analog Switch Drain Terminal
 S1–S4 : Analog Switch Source Terminal

Passives, resistors, diodes, caps
The thru hole stuff.


Jacks & pots.
Nice.

Input 1 is internally connected to the switches on jacks 2, 3 & 4.
CV 1&2 is internally connected to the switch on the CV 3&4 jack.
The signals to the OUT ALL jack are summed together
 Links:
- NLC build notes.
- NLC blog
- Facebook
- Muffs2016

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You can find more NLC builds here.
http://djjondent.blogspot.com.au/2015/03/non-linear-circuits-ncl-index.html
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Serge Bi-directional Quad switch - build notes

July 31, 2017, 7:07 pm
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I've been searching for the perfect synthesizer router for my Serge.
The Serge Bi-directional router is fine but I would love to have more ins/outs.
Recently I built a NLC 32:1and NLC Router for Eurorack.
All excellent and I might one day adapt one for the Serge.
One I haven't tried is the serge Quad switch which seems to be an adaptation of the earlier
Serge Triple Bi-directional R.

The module I'll build is the Cat Girl Synth CGS 88.
Ken's Build notes are here:
https://cgs.synth.net/modules/cgs88_bds.html

The Quad switch uses aCD 4013B.
Its a CMOS Dual D-type flip flop that works as a two bit binary counter.
Looks like the switch used in the vintage 1970's module was a Motorola MC14007UB.
It was mounted on a separate board off the original R4 PCB.
You can still find these.

D = Drain, S = Source.





to be continued..... waiting for parts.
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8 Bit Cipher - NLC - Build notes.

August 1, 2017, 4:52 pm
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Burma - travel pics

August 10, 2017, 5:24 pm
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Roland TR - 727

August 10, 2017, 5:40 pm
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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.

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.


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Feague - NLC - Build notes

August 15, 2017, 5:00 pm
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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



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Wagernumb - NLC - Build notes

August 16, 2017, 4:34 pm
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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



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NLC - RingPull - Rimples - Ringmods ??? - build notes.

August 17, 2017, 10:59 pm
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These are my build notes for the Nonlinearcircuits RingPull Eurorack module.
Actually, the final name isnt set in stone yet.
Rimples ?? Ringmods, ??? Ring Pull ??
 The PCB above is I understand an earlier version called Rimples.

The version I'm building today is a prototype - version 5 of the module.
There might be future changes.

Andrew F describes it as a ring modulator with a phase locked loop to do the modulating!
The PLL can be set to lock tightly, loosely or not at all with the incoming signal.

Some pics of the virgin PCB & faceplate.:

At the time of writing, there are no official build notes or schematics.
The CD 4046 is a CMOS phase locked loop (PLL) IC.
Its the oscillator that provides the modulation for the ring mod

Links;
+ NLC Blog - things to come 2016, Rimples
+ Muffs - 2016
+ PLL - VCO basics- youtube

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Barcelona - Tribute.

August 18, 2017, 4:26 pm
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Article 0

August 18, 2017, 5:06 pm
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I did some testing of a WAD (Wilson Analog Delay) last week.
It's an amazing effects unit quite unlike anything I own.

A post shared by jono (@dj_jondent) on
These are videos recorded on Instagram.

A post shared by jono (@dj_jondent) on
The sound is cleaner than my Buchla 288v ... though I like that for other reasons.

The WAD is so hard to find these days due to the rarity of its components.
.. those SAD1024 chips.

The SAD1024 is a 512 stage bucket brigade analog delay chip
It has 2 independent delay sections.
The Bucket Brigade consists of a series of capacitors that pass the analog signal
like a line of people carrying buckets of water to put out a fire.
The analog signal in each capacitor is forwarded to the next stage using transistors that act a switches.
The rate is determined by an external clock.


It's difficult to say what portion of the WAD's magic is due to the SAD1024 but for the record 
these also use it:

- Ace-Tone EH-50 Delay
- ADA Flanger (Early ones)
- Anderton Flanger
-  BEL ELECTRONICS  Delay/Flanger BA-40
- Boss Flanger BF-1
- Dynacord DC300-e
- DDD Flanger 640
- EHX Electric Mistress
- EHX Deluxe Memory Man (4 knob)
- EHX Memory Man Solid State Delay
- EHX Memory Man Echo/Chorus (non stereo)
- EHX Slapback Echo
- EHX Stereo Slapback Echo
- EHX Small Clone (not all)
- EHX Deluxe Electric Mistress
- EHX Clone Theory (w/Edge switch)
- HARMONY  Synthesizer
- KORG  some keyboards
- IBANEZ  Flanger FL-305
- LUPINE  Systems SAD1024 Delay
- MAXSON  MP-DL201 Flanger
- MONTGOMERY APPLIANCES 77 Flanger (ADA Flanger Clone)
- MXR Analog Delay - but NOT the M-118 version, I am pretty sure it was called M-117
- PAiA flanger
- Roland - some guitar pedals
- Ross Flanger (Stereo delay R-80)
- Sovtek Electric Mistress (prototype)
- Tel-Ray Morley Chorus - Flanger CFL
- Vox 1902 Flanger (1981)

Links:
- EGRES
- muffs1
- Ken Stone - CGS208

Ebay has a few of these chips but who knows the quality. Or you could "borrow" them from existing pedals though I think that's sad (no pun intended).

An alternative chip could be the MN3007. Its also a bucket brigade IC.
It is used by Boss in the DM-1 & CE-2. Also in the EMX Memory Man & Small Clone
the AD-999 by Maxon & the Analog Delay by MXR.
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