Buffered multiples - BMC Eurobuffer

Just built a Barton Musical Circuits Eurobuffer. BMC037. It's a buffered multiple.
Very easy build. Uses a TL047
Build notes and schematics are here:
http://www.bartonmusicalcircuits.com/eurobuffer/

Got me thinking about how they work just in case I wanted to go totally DIY.
MFOS - Music from Outerspace use TL084s instead of TL074s
 http://musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=OLDIESBUTGOODIES/VOLTAGEMIXER/voltagedist1.html

They call their multiple a "Control Voltage Distributor".
The pinout for the TL084 & TL072 are identical

Probably any low offset, high speed opamp will work ....
such as the TL062, TL064, TL072, TL074, TL082, TL084 series

Links
+ BMC website (lots of great stuff here)
+ Muffs

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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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Sonic Potions - Penrose Quantizer

I purchased this as a kit a few years ago and only recently built one.
Here are some pics.
The official build notes are here:
https://www.sonic-potions.com/penrose

Its a fairly easy build.
Trickiest part was getting the buttons to line up perfectly straight.

 Each pack comes with some camel balls and some jewelry

The Jewelry is in the shape of a bottle of potion.

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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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Pachinko - Hiroshima

Some pics of a Pachinko parlour. This one is in Hiroshima near the main train station.
A really loud place. It reminds me of the poker machine parlours you will see in Australia.
Though i understand that gambling for money is illegal in Japan.

The Pachinko uses 1 mm diameter steel balls, which are rented to the player by the owner . In comparison a western pinball game use a larger single ball.

So its a bit like a vertical pinball game.
The pachinko player loads one or more balls into the machine, then presses and releases a spring-loaded handle... just like a western pinball.

The Pachinko playing field, is populated by a large number of brass pins, &several small cups (catcher) into which the player hopes the ball will fall. A ball which enters a catcher will trigger a payout (more balls). These balls are dropped into a tray at the front of the machine. They are the reward (not money).

The balls can't be removed from the parlour, but can be exchanged for tokens, or prizes.

#pachinko #japan

A post shared by jono (@dj_jondent) on Apr 29, 2018 at 3:53am PDT.....

For more travel postcards click here:

http://djjondent.blogspot.com.au/2015/03/travel-postcards-index-my-travel.html

Millis Function - blinking 2 LEDs

 The is an example of multitasking using the Millis ()

I'm using LEDs conncted to pins 8 & 9 

they each have their cathode connected to Gnd via 220 ohm resistors

The Code:

// &&&&&&&&&&&&&&&&&&&&

unsigned long startms =0;

unsigned long previousMS = 0;
unsigned long interval=1000;
unsigned long previousMS_2 = 0;
unsigned long interval_2=500;

#define LED1 8
#define LED2 9

int LED1_state=0;
int LED2_state=0;

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
}

void loop() {
  startms = millis();

  // code 1 for LED 1
  if (startms - previousMS > interval){
   previousMS = startms;
    if (LED1_state==0) LED1_state=1; else LED1_state=0;
    digitalWrite(LED1,LED1_state);
  }
  // code 2 for LED 2
    if (startms - previousMS_2 > interval_2){
   previousMS_2 = startms;
    if (LED2_state==0) LED2_state=1; else LED2_state=0;
    digitalWrite(LED2,LED2_state);
    
  }
}

// &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

Zlob Dual VCA

As the old saying goes..
You can never have enough VCAs
Esp when they are only 2HP wide !!!!

These are some pics of my building of the Zlob Dual VCA

 These are not build notes. Just pics to help me remember should i want to build another one.
The official build notes are here:
https://zlobmodular.com/dual-vca/

There are no hard to find parts.

 The important thing to remember is to keep the height of all components as low as possible.
They need to fit behind a 2HP panel.

 So i bent these trimpots back.

The ICs need to be soldered directly to the PCB to keep their height down.
i ALSO bent the caps down and isolated them with shrink wrap

 Everything fits... beautiful.!!!

These trimpots need to be calibrated to close the VCAs... to prevent audio bleed. I did this by ear.
Works great.
I'll probably build some more.
:-)
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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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Zlob Mini Mixer

You can never have too many mixers.
(Esp when they are only 2HP wide.)

I'm building a performance Euro case and these will come in very handy.
Zlob stuff is awesome and so cheap esp if you do it yourself.

I've built two already. Two more to go.
These aren't build notes. The official Zlob site with BOM is here:
https://zlobmodular.com/minimix-2/

20K SMD trimmers

oP Amps NE5532

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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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RYO - Penta Sequencer - Ljunggren Audio

This is a really useful and compact Ljunggren Audio sequencer.
Just 5 steps, but its switchable to 4 & 3 steps.
I may end up using this more as a modulation source than a standard sequencer.
I purchased just the PCB and faceplate

The build is straight forward. Components are easy to find ... mostly mouser.
Just watch the height of the electro caps ... make sure you have enough clearance between the two boards. These are not build notes.
For detailed build notes check out Ljunggren Audio's great site.
http://ljunggrenaudio.com/products/sequencing.html

The sequencer can be powered off 15V (though I'm building this version for Euro's 12V standard).
You can also adjust the CV output voltage ranges. This sequencer is set to 0-5V but its possible to change it to ranges like 0-10V (Buchla ?? etc )
http://ljunggrenaudio.com/products/penta%20modifications.html

bELOW are some pics of the components I used.... from mouser.

The yellow electrical tape is a bit of protection against any shorts between the two boards .. the electro caps I used were too tall.

Leds.

----------------------------------------------------
Second build:
I didn't remove the tall caps so had to somehow extend the length of the headers that connect PCBs

 I also used long shaft pots from Modular Addict.

 Nice. :-)

Links:
Muffs


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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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