Showing posts with label Buchla BOB-toolbox. Show all posts
Showing posts with label Buchla BOB-toolbox. Show all posts

Thursday, 6 June 2019

Portabellabz VCS3 Card for 208

These are some pics taken during my build of the Portabellabz synthi/vcs3 card/
Its designed to be an expander for the Buchla 208 / Music Easel.
These are un-official notes and I'm not affiliated with Portabellabz.

The Official website is here:
+ http://www.portabellabz.be/vcs3.html 
+ Official Manual
+ Official Build notes
+ Muffs build thread

Resistors, IC sockets, Voltage regulators etc

Trim pots and caps.
The order of placement of my components isn't ideal. It was dictated by the components I had at hand and more were added as components arrived.

The rear so far.

More pots arrived :-)


This 2n5172 trannie is for the noise. Cut off the centre leg.
You need a to order a few of these so you can select the best one for the noise. (see build notes).

Some close ups .. esp of that 2n2916 and the 1K TC resistor



initial panel wiring

The noise transistor

There is one standoff missing .... between the freq and sync inputs.


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Monday, 3 June 2019

EMS Synthi Repair pics

 Some pics of the restoration of a Synthi AKS

...
 ....

I had the pleasure of meeting Constantin Papageorgiadis on holidays from Belgium.
Also known affectionately as Papz. His website is Portabellabz


My synthi has some rather unusual mods which was was trying to identify

 The KS - Keyboard Sequencer.
It's in better condition than I expected, though the keybed is rather worn.






These are old caps and trimmer pots. The Synthi is an ex-NIN synthesizer.
My friends want me to try these on ebay. ... :-)
Maybe

Constantin also knows quite a bit about the Buchla 208
I was lucky to have him look at one of mine.

Testing the VCS3 card for the 208

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Friday, 3 May 2019

Buchla Index

Buchla, Non-Buchla DIY Clones, Buchla Format & Ecosystem Modules


General


Easel
 + Buchla Easel - Program card map for BEMI,Vintage & Rev II 208. 
 + Korg Monotron (duo) -Buchlaized 
 + Portabellabz BOB Expander (Papz/Constantin) - build notes etc
 + Portabellabz BOB Toolbox - (Papz/Constantin) - Build notes 
 + Portabellabz BOB -VCS3 card - Every Easel needs a synthi -build notes
 + DIY Audio mixer for 208 easel - Schematic 
 + Kaitlyn Aurelia Smith - SugarMountain 
 + Variation 3 
 + Volca Bass
 + Buchlaized Korg Volca Bass 
 + Korg Monotron 
 + Easel Program Card Map 
 + Krell patch - figure 21

100 
 + 102 - Non-Buchla DIY - LA 67 - build notes
 + Phase vs Frequency Shifting - Model 196 vs 185


200
 + 25S
      Non-Buchla DIY - 216r - build notes
 + 246r - sequencer (Non-Buchla DIY)
 + 248r
      + 248r expander (rev1) 
+ 281
 + 284r - Build pics 
 + 296r - Roman/Buchla format sound demo


200e
+ 222e
      *Notes
      *Buchla Grunge
      *Buchla Acid Train
+ 225e
+ 250e
+251e
       *  My notes on the 251e
+ 252e
      * Notes on the 252e
      * Buchla 252e & 266r
+ 261e
+ 266e
       * Notes on the 266e 
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Saturday, 2 December 2017

DIY index

This is the index for all DIY projects.

General Electronics
+ LCD display i2c - part 1  
+ LFOs - making simple LFOs using a CD 40106 IC
+ Microcontroller... What you need to program a MCU 
+ Microcontrollers... Programmers
+ Sequencer CD 4017 
 + Simple oscillators & LFOs using a CD 40106 IC
+ OTAs - operational transconductance amplifiers
+ Panel, making using gerber files
+ Switches - Momentary push buttons & Pull down resistors   
+ TKB - Serge Build notes (Human Comparator)

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

+ 3 Trins Video synth
+ The Ship of Thesus
+ Adding anchor links in Google blog

ARP 2600 - TTSH

Balanced vs Unbalanced Audio

Buchla
 
Cat Full Of Ghosts
 


Ciat Lonbarde
 + Gerassic Organ

CMOS
+ Sequencer CD 4017 
+ Simple oscillators & LFOs using a CD 40106 IC

Eurorack

 + Adding +5V  to your Bus.
 + Distribution  - power bus

Elmyra Synth 
   + Build notes


Fates 
+ Fates - a DIY Norms for Rasberry Pi

 Influential ICs

Jasper - Wasp
+ Build notes for the jasper - Part 1
+ Jasper build notes - Part 2
+ Midi interface

Lorre Mill
  + U Tone

LZX - Cadet
 + Cadet I - Video Sync Generator - Build notes
 + Cadet II - RGB Encoder - Build notes
 + Cadet III - Video input - build notes
 + Cadet IV - Dual Ramp generator - build notes
 + Cadet V - Scaler - build notes
 + Cadet VI - Fader - Build notes
 + Cadet VII - Processor -Build notes
 + Cadet VIII - Hard Key Generator - build notes
 + Cadet IX - VCO - build notes
 + Cadet X - Multiplier - Build notes

LZX - Castle
Introduction
00_000 ADC - Analog to digital converter
01_001 DAC - Digital to Analog converter
02_010 Clock VCO
03_011 Shift Register
04_100 Multi Gate
05_101 Quad Gate
06_110 Counter
07_111 Flip flops


Microcontrollers
+ Microcontroller Index Page

NLC
+  Full list of (NLC) NonlinearCircuits projects

PSU  juice for your synths
 + NLC large board - build notes
 + NLC small board - build notes  
 + BOSS ACA vs PSA Psu (Power supplies)


+ Resistor Arrays
+ Serge - CGS - Buchla

+ Shopping for components
+ Soma - Lyra 8 build
+ Synth Lab (SDIY)
+ Synthacon - Steiner-parker

Python
+ Python for beginners 1
+ Python for Beginners 2

Soma Lab
 + Lyra 8 build - part 1 
 + Lyra 8 Part 2
 + Lyra 8 Part 3 is here
 + Making the Lyra Panel face plate
 

Thermin
+ Thermin - Silicon Chip general info

Vidiffektor - build notes

Wirehead Freaq FM

Wasp - Jasper
+ Build notes for the jasper - Part 1
+ Jasper build notes - Part 2

-----------------
+List of integrated circuit dimensions
+Surface Mount Nomenclature & Packaging.
+SOT (Small Outline Transistor dimensions)
+Voltage divider, LED resistor calculator 
+SMD / SMT resistor code
+Desoldering tips - Belltone 

 

 "The man that hath no music in himself,
Nor is not mov'd with concord of sweet sounds,
Is fit for treasons, stratagems, and spoils."
- The Merchant of Venice (V, i, 83-85)

 

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Thursday, 26 October 2017

Buchla Easel - Portabellabz bob expander.

These are my build notes for the Bucha easel BOB by Portabellabz.
You can find the docs here .
It's quite a neat little unit. And it's expandable.



The two ICs are a TL071 op amp and a CD 4093. The TL071 is I think used to invert the EG.... the second left output jack.  The 4093 is I think used for converting gates to triggers ???... for the pulser trigger out ???

The trimmer sets the voltage level of the pulse trigger out. ... If using eurorack the voltage level of the pulse out can be reduced to 5V


Papz has left a section on the right blank to add your own circuit.
I'm putting in a square wave LFO/audio oscillator which you can find in the build notes.
I first tested this on some bread board.

Used just one 741 op amp, one capacitor (220nf) & 7 resistors.
The uber basic circuit is here
It's about as simple a circuit as you can get. An op-amp with positive and negative feedbacks.
The inverting input is connected to a RC (resistor capacitor) network. The non-inverting input is connected to a voltage divider.
It's classified as a astable multivibrator which has two states, neither of which are stable. It is constantly switching between these two states with the time spent in each state controlled by the charging or discharging of the capacitor through a resistor. The op-amp works as an analogue comparator... comparing the voltages at its two inputs.
The full schematic is here:

 Yup. It works both as a modulation oscillator and a audio oscillator.

Now to build it into the board.





So the the connections from left to right are:
- sequencer pulse in
- envelope inverted out / envelope trigger out (switchable)
- pulser pulse in
- pulser trig out (the internal short pulse occuring at the end of its cycle, not the ramp on yellow bananas)
- MO modulation switch CV
- LPG1 mode switch CV
- LPG2 mode switch CV
- LPG2 signal routing switch CV
- extra oscillator - switchable between LFO & Audio.
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