Saturday, 24 September 2016

3 Trins video synth with FetidEye's comparator

I really love this comparator. Awesome job FetidEye.
This is a short video showing the effect of the comparator on a external video.
(a old Japanese Samurai film)

The comparator video is the one on the top left. 


...

Thanks to Cobramatic for borrowing his comparator


Friday, 16 September 2016

RIP Don

RIP Don Buchla

So sad. Don will live on through his friends, family & instruments.
His life and achievements have changed so many people including myself.
He is Immortal.

Buchla 100

Buchla Music easel

These are all vintage 200 modules. 246 (Sequential Voltage Source ) on the top. From the left, 205 matrix mixer, 258 VCO, 281Quad Function Generator, a 296 Spectral Processor and a 221 keyboard controller on the bottom.

Tuesday, 13 September 2016

Euro build notes for a Serge Resonant EQ Mk. II

These are my build notes for a Euro format Serge Resonant EQ Mk. II.
Mk. II daughter board and Mk. II panel by Clarke

 First the virgin PCBs.
This Euro version still uses Ken Stones CGS 202 pcb.
http://www.cgs.synth.net/modules/cgs202_reseq.html

 Official BOM for the daughter board:

SMT Components
[3] TL074 (SOIC-14)
[10] 330R Resistor (0805)
[25] 47k Resistor (0805)
[2] 0.1uF Ceramic capacitor (0805)

Through-hole Components
[18] Kobiconn 16PJ138 jacks
[10] Bourns or Alpha 45mm LED sliders
[2] Alpha 9mm pots or similar, value 50k Audio.
[10] LED Current-limiting Resistors - value varies by slider brand and LED color.
        I'm using 1.2K.
[2] 22uF Electrolytic capacitors
[2] 1N4001 Diode
[1] 2x5-pin Eurorack power header
These are the 330R resistors.... outboard resistors.

Next the 47K SMDs.

[2] 0.1uF Ceramic capacitor (0805)
[2] 22uF Electrolytic capacitors
[2] 1N4001 Diode
[1] 2x5-pin Eurorack power header

SLIDER Pots, jacks, etc.


Now for the main PCB.
Resistors & headers 1st.

What capacitors should I use ???

Ken Stone's site says this:
"Traditionally, polystyrene capacitors are used for all of the smaller value capacitors in this module. I have not tried using other types and cannot say whether using the polystyrene capacitors makes any audible difference. From 10n, up greencaps were used. In modern terms these would be MKT or MKS. Note that there are also 10 x 10n decoupling capacitors. These decoupling capacitors can be MKT, MKS, monolythic ceramic, or anything else that will physically fit."

For this build I'm using ceramics for the 680pf & 220pf. The jury is out on whether axial polystyrene sound better. The price difference is considerable.
I'll use Axial poly's in my next build and see if I can detect a difference.


Links:
1. Muff wigglers
2. Ken Stone - CGS
Video 1
Video 2


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To be continued.

Friday, 9 September 2016

FK1T - VCF build notes (NonLinearCircuits)

These are my build notes for the NLC FK1T VCF.
This VCF is based on the extremely rare Korg FK-1 pedal.
They are hard to find and often sell on Ebay in the $1000AUD range.
The FK1 is a similar VCF to the ones found in the 800dv, 770 and 700 synthesizers.


The virgin faceplate & PCB.
Labels are based on 70s Korg nomenclature as per the original module.
 Korg 800dv

 ..
Mainly surface mount passive components.  ... just one TL074 opamp.
 ...

  No NLC build would be complete without some words of wisdom
 Contemporary Art Hates You - John Waters.

The point of art is to "wreck whatever came before it," he believes. "That something is pretty and beautiful is probably the worst thing you could say today in contemporary art...unless it's so pretty it's nauseating."

This 074 is hopefully the only tricky part of this build.


-----------------------------------
Links
++NLC Build notes
++NLC Blog 1
++Muffs... NLC 2016 modules
++ NLC facebook


To Be Continued. JP.

3Trins RGB + 1c

Testing the 3Trins with an old ARP 2500 video.



Wednesday, 7 September 2016

The 3Trins case

I'm putting this portable Video Synth case together for a future gig.

 An old Haliburton Zero came in handy.



3TrinsRGB Patches

Recording some patches.
The 3Trins patchbay is where all the magic happens.

This page will develop as I add to the number of patches.

video modulating the red oscillator (Vid -->Rcv)
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Video modulating red & blue oscillators.
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