Showing posts with label DIY. Show all posts
Showing posts with label DIY. Show all posts

Friday, 12 October 2018

Soma Lab Lyra-8 DIY build - Part 1

Some pics of my Soms Laboratory Lyra-8 build.
This synth comes from Russia. Soma describe it as a "Organismic Synth".

It's 8 voice, totally analogue, with built in delay & distortion.

Each voice can be tuned independently.


It's making me reconsider what a synthesizer actually is .... Soma don't desciribe the voices as VCOs..
rather they are organ style voices that are triggered with circular touch contacts. This does not have a regular keyboard. There is no 1V/oct input.
(I'm actually using some circular screws I got from my local hardware store).

" Each voice produces raw waveforms that can be shifted from triangle to square. Acting in pairs, they serve as carriers and modulators in a rather mind-blowing form of knobby, interactive FM synthesis." (SOS).

The frequency of each voice ranges from LFO can be triggered via the touch contacts to form chords, drones etc.


I owe much to radio engineer Vlad Kreimer for making this possible.



This has been an on-going build for quite a while.


Many of the parts can't be sourced from my regular suppliers like mouser , etc so I've resorted to Ebay ... so who know how good the quality will be.
So far the build has been easy - it's all thru hole, and the components are well spaced.
Lots of room for future mods.


Most of my time has actually been consumed with translating the BOM to parts which are easily available in Australia (digikey, mouser etc).
Also I was initially confused with the different PCB revisions

It has stalled for the moment as i'm waiting on a front panel (from a friend which may never appear ???).
I may resort to hacking my own DIY panel.

Part 2 of the Lyra Build can be found here:
https://djjondent.blogspot.com/2020/03/lyra-8-build-part-2.html

Part 3 is here
https://djjondent.blogspot.com/2020/03/lyra-build-part-3.html

Part 4: Making the Lyra Panel face plate

Links:
+ Lyra FX eurorack module
+ Soma Lab
+ Muffs DIY kit
+ Muffs - modded lyra ?




Wednesday, 10 October 2018

New Sound Waves - Meeting 2

This was held on Sat Oct 6th Oct.
Lots of fun !!!


sOME LZX cyclops lazer action




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Come to the next meeting.



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Tuesday, 9 October 2018

Voltage Processor - CVP - Build

Though not the sexiest module in your modular rack, the voltage processor is very useful and in fact essential to get the most out of your system.

I've got a quite a few in the Buchla format.
These are great pages concerning the Buchla CVPs
++http://buchlatech.blogspot.com/2008/10/musings-on-voltage-processors.html
++ Muffs = 257r build

Serge also have many voltage processors. These links should get you started
++http://www.serge-fans.com/m-class-cv-processor.cfm
++Random source
++http://djjondent.blogspot.com/2015/11/voltage-processor-cgs-81-build-notes.html
++Elby ES14
++ Serge.net -R1 The paperface dual voltage processor

Today I'm building a Euro CVP From Manhattan Analog
The build notes are here


Pretty easy build. the components are marked on the PCB.
The trimpot is 20k

The two ICs are basic Op-amps ... a TL074 & 072


There are two 50k and a 1M pots , The 50k are Linear.
I've seen builds of this with the 1M being either audio or linear (P3/Glide is the 1M.)
I'm building this with 1M linear.
I'll build another one with a audio pot and see how it behaves.









The anode of the LED goes into the square hole.

to be continued......

 

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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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Thursday, 27 September 2018

3Trins Plugin: Video in-Lines

Some pics of my build for the last of the 4 new plugins for the 3-trins video synthesizer by
Gijs Gieskes. Called "Video In Lines".
The manual says :
" This plugin adds high frequency vertical square wave lines (to) selected inputs.
   These inputs can be any of the header connection points.
   It works best on the output connection points or the - connection points,
   so connect for instance >0Filt to <>Rout.
   CV inputs wont work well, because the frequency is to high".
 

The official plug-ins page is here.
http://gieskes.nl/instruments/files/3TrinsRGB1/Plugins/

 *****3trins facebook******

The SN74HC14N is a Inverting Hex Schmitt-Trigger.
A Schmitt trigger is a comparator circuit with hysteresis. It converts an analog input signal to a digital output signal. 

I think the 7414 is being used here to build the oscillator circuit. 
for the new high speed square waves.







:: HEADER CONNECTIONS
> 075: 75ohm output
> 075: 75ohm output
> 470: 470ohm output
>0Filt: Output with capacitor filter fade effect
<Reset: Reset input
<Reset: Reset input

 So we have 4 outputs and two reset inputs.

SOME patches



INSTAGRAM


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3Trins Plugin: 2xVideo in Negative

Some pics of my build for the 3rd of 4 new plugins for the 3-trins video synthesizer by
Gijs Gieskes.
 The official plug-ins page is here.
http://gieskes.nl/instruments/files/3TrinsRGB1/Plugins/

 *****3trins facebook******

This is called the "2xVideo in Negative"  
Looks like it adds TWO more external video inputs to the header
The manual says that the "two signals can be faded independently and are inverted.
You can make them positive by using the - (minus) inputs".
 
::HEADER CONNECTION.
There are 3 header inputs for each connection
> V1 x3: input one
> V2 x3: input two


 

 

 
::HEADER CONNECTION.
There are 3 header inputs for each connection
> V1 x3: input one
> V2 x3: input two

 These  (V1 & V2) appear to be inputs only. Maybe for plugging some modulation sources like LFOs ???

3 trins RGB +1 - plugin SPST & SPDT

Some pics of my build for the 2nd of 4 new plugins for the 3-trins video synthesizer by

Gijs Gieskes

The official plug-ins page is here.
http://gieskes.nl/instruments/files/3TrinsRGB1/Plugins/

 *****3trins facebook******


This is slightly different to the previous 2SPDT/4SPST build.

This SPST & SPDT uses a CMOS 4066. It's a Quadruple Bilateral Analog Switch.


The SPST&SPDT behaves like a CV controlled switch.
There are just 2 switches:
Switch A on the front & switch B on the rear.

Switch A has the following connections (on the extreme right in the photo above):
<> 1CTRL: Toggle input
<> 1Anc: Normally connected
<> 1Bno: Normally open
<> 1AB:Pole/common connector

The  "1CTRL" input is where you plug your modulation source (such as a LFO).
The pot on the right appears to modulate the 1CTRL input

Switch B on the rear has these connections:
<> 2CTRL: Toggle input
<> 2Bno: Normally open (multiple connection)
<> 2Bno: Normally open
<> 2Ano: Normally open

The  "2CTRL" input is where you plug your modulation source (such as a LFO).
The pot on the left appears to modulate the 2CTRL input
2n3904 TRANNIE



tOP header


Testing the perspex guards.... the transistor needs to be bent down for everything to fit.


Example patch:

So you take a signal, eg video from the header and patch it to 1AB.
Then run G- to 1Anc and B- to 1Bno.
Now patch one of the LFOs (eg F01a) to 1CTRL. The knob on the right appears to set the point where switching occurs ...you should start seeing the video input jumping from B- to R- in time with the LFO.

The B side is similar, but it just connects two points On or off, instead of the A sides 'this or that'.



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...............

3 trins -video synth plugin - 2xSPDT & 4XSPST

Some pics of my build for the 1st of 4 new plugins for the 3-trins video synthesizer by
Gijs Gieskes

The official plug-ins page is here.
http://gieskes.nl/instruments/files/3TrinsRGB1/Plugins/

 *****3trins facebook******


This (as the name implies) uses 6 push button switches.
Two single pole, double throw (SPDT)  & four  single pole , single single throw (SPST)
Looks like switches A & B are the SPDT.
Switches C,D,E,F are the SPST
These will turn on & off any extra connections you that you choose to make using the upper header patch bay.
 
aND the other side:


 The upper header first;
Finished.
Such a simple build. Now to try some patches:

tHE switch system is really cool and easy.

The inputs and outputs of the SPDT switches (buttons A & B) are on the left of the module.
Connections for Switch A is on the front & for switch B on the back.
 For switch A:

So you would connect any inputs to AP1 and outputs to AT1 & AT2
-----------------
The right side (front) has connections for the C & D switches.

That same side on the rear has connections for E & F. (FR,FT & EP,ET)


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