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 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