Tri interesting circuits for hi-fi or post-production ,or simply experimentation with synthesized sounds ,circuits are from Bulgarian magazin : Radio ,Televizija  Elektronika 1975 ,i read somewhere one can use NTE 909 as equivalent


 presence filter ,tone controls and 4 band eq

Digital Quantisizer  from Elektor Magazine October 1983

 

 

 

too much fm in the buchla oscillator one ,changed the attenuator from 50K to 200K for more reasonable detune ,on soundcloud : https://soundcloud.com/r25990127/sound-71

drndorec.

Serge Gamalan VCO , tested and working , IC is LM3900 ,updated layout to better fit the resistors and the second trimmer - here

earlier builds

a little gallery of the synths i've built

 

This is a 4U format ,Serge-a-like single panel modular ,i think this was something i spent most time on ,it is specific as it had only Yamaha GX BPF and Low Pass Gate ,2 x 258 Buchla VCO's ,Serge Wavemultipliers ,Serge SSG and Hagiwo's Bezier Random ,also Buchla 106  and Buchla 194 BPF and few other things .The enclosure was packed with shitload of PCB's .The PSU was external .This one went to Croatia .

This is my current synth . It was built out of modules i had leftover from my big Serge-a-like with 5 panels .It is still not completed ,few pcb's just wait to be populated . This is mostly Electronotes - Synthesizer ,VCO ,VCA ,VCF is Electronotes ,the rest is a pair of 111 Buchla ,NLC Spasm ,Buchla Quantized Random ,LPG and so on . This one is built inside an old tube radio enclosure and i love how it turned out .

 

 

This is Best of CGS that i built for a friend in Netherlands ,he had the complete kit so i just put it all together , it was really fun as i never built anything with a kit earlier ,this is really a breeze ,if you can buy the kit buy it .t

 

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This is a 4U Serge-a-like panel i built for a friend in Japan .This was a first time i built anything into a Hammond enclosure so it was a battle for me .Anyway in the end it turned out all right i guess .This one has a 4 Step Programmer/Seq by Serge ,2 x Serge VCO's ,Serge 73 VCF ,DUSG and so on ..

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This one went to UK ,and it was built many years ago actually .Into an enclosure from Industrial Equipment ,it was really heavy ,I recorded some interesting patches using just this ,based mostly on Serge VCS ,NLC Difference rectifier ,NLC CHaos ,CGS Grinder and so on.

This one i built for friend locally ,and i really built it as if i was making it for myself ,it had really interesting selection of modules like a Wogglebug ,Serge VCO ,Oberheim VCF ,even a PAiA BPF .

This is my very first synthesizer ,it was really a wreck and you had to hold parts of it when you played ,it had lot of cardboard and whatever i could find for panels ,i had lot of fun with it ,and even recorded something i still like the most .
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I built this one for friend locally and it really was first really good looking synth i built i think ,it had Arp VCF , 2 x Buchla 258's ,Electronotes Thru Zero VCO ,VCS Serge ,Roland ADSR and so on ..
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This one....

this panel is next ,the case is Modcan style ,using banana jacks as my earlier panel ,ring mods and quantized random are ready ,panel printed ,psu ready and good mood, modules yet to be inside for more then noise :
    Quadrature Zero VCO
    Yamaha GX VCF ( or Korg MS20 VCF)
    Buchla 291 VCF (single )
    Buchla 111 Ring Mod. (Dual to use for Freq Shifting)
    Dome Filter
    Crossfader Dual
    Extended ADSR Serge ( Dual )
    Fixed Filter Bank ( 18 Bands )
    Master Clock Divider CGS
    Buchla SOU (only Quantized Random section )
    Attenuverters x 3
    Analog Switch Matrix - Roland System 700
    Hip Bass Drum - C. Anderton

Snare Drum Roland 808

Rimshot Roland 606
Electro-Harmonix Sonic Boom
Envelope Follower/Preamp Buchla Music Easel
Noise Gate J.Haible
Experimental Hardware Neurons x 4 - Wiard

something played live in audiomulch in year 2008

Buchla 194 fixed bandpass filter according this this schematic , PCB layout is not tested yet

PCB Layout for VCA from Nonlinear circuits and Xmix from EFM's Wildcat on a single PCB 70 x 70 mm ,tested and working ,schematics is here

Simple Theremin ,article by Jake Rothman in 1995 September issue of Practical Elecronics

 

 

Filtellator Filter/Oscillatror - prototype by Aaron Cram at waybackmachine