Envelope Follower and preamp from the book Nouva Generation de Musicales Istrumentos electronikos , PCB layout is 300dpi not tested

EM&M Harmony Generator redrawn layout , print is in 300dpi 

Dome Filter designed by Osamu Hoshuyama , i assume there can be a pot to get a 3rd phase , PNP layout is 300dpi not tested 

Fixed Filter Bank Based on design by Juan Bermudez's Nueva generación de instrumentos musicales electrónicos , i added 4 more bands following the capacitor table , high q settings on the resistors , individual outs , PCB is 160x100 mm 300dpi

Xfade Dual Crossfader based on Buchla circuit , PNP layout is in 300dpi  , more about the circuit here : http://electro-music.com/forum/topic-17019.html matched transistors are BCM847 (edit: this is a working circuit ,however you need to add 68K or similar at the audio inputs to fix the gain problem)

Roland System 700 Analog Switch, here is schematics  , without the manual push button ,only 3 inputs i needed for my synth, pcb is still untested the single op-amp is TL071  , it's 300dpi ready for PNP

Save File II : Serge VCO (Retro) , Serge R-Series Envelope ,Buchla 291 BPF , Yamaha GX VCF ,Xfade x 2 , Clock Divider , Experimental Hardware Neurons G.R. ,Dome Filter O.H. , EMS Ring Modulators , Monotron Drums ,Hip Bass Drum C.A. ,DC and Audio Mixer ,18 Band Fixed Filter Bank J.B. ,Noise Gate J.H. ,Roland Analog Switch

R Series Serge - Envelope Generator ,before it cycles

Serge VCS in Eurorack

Buchla 192 Dual VCF / DC Mixer-Processor / CV Twister - Eurorack format 

   Buchla VCO's Eurorack panel

Demo : https://soundcloud.com/r25990127/buchla-258-x-2

Buchla 258 VCO PCB 

Serge VCFQ and Waveshapers eurorack panel

Multi Phase Waveform Animator circuit from http://electronotes.netfirms.com/ #87, by Bernie Hutchins , original layout by Scott Bernardi ,i just draw over it , there was mistake in original layout with power lines as it's described here http://www.bernacomp.com/elec/og2/og2_waveanim.html , there are four jumpers on the print png instead , print image should be 300 dpi , you might need to rescale it 

my 'save file' . loading with pcb's .

https://archive.org/details/SketchbookIi-SynthacksModular

Dual VCO and dual Waveshaper Combo - Eurorack