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Friday, July 10, 2026

West Coast Mini

 







Another project that's been sitting on the workbench for years , another single panel synth ,this time in green and yellow knobs and jacks .This project is almost done but i grew tired of synthesizers i guess after 15 years of soldering ,one must grow tired a bit . The enclosure for this is very shallow i meant to make a new enclosure for the same panel and have a PSU integrated in the box . This is Volk comparing to Volca , it has 1 x 258 Buchla ,1 x Low Pass Gate ,1 x High Ripple VCF (Electronotes) ,1 x DUSG Serge ,1 x Serge SSG ,1 x NLC Spasm ,1 x Buchla 208 Uncorrelated Random ,1 x Serge Tripple Waveshaper ,2 x LFO's EFM ,Xmix EFM ,Serge Noise ,and thats alot ! The panel is specious and the thing is ,this is almost complete ... Most of the PCB's are soldered ,,2 or 3 left to complete and wire up . 

Thursday, July 9, 2026

Џумбуш Кутија


Another GrooveBox is finished. This time with 4× Hagiwo Sampler Drums, CGS Gate Sequencer, Yusynth Pulse Delay, and Buchla 208 Random. Instead of a regular kick and bongo, there are samplers — that’s the main difference from the previous machine. Together they now hold 240 sounds, each 600 milliseconds long at 48kHz.

The enclosure was something I found lying in the mud at the junkyard. It looks like an old fiscal cash register, or maybe some other device. Sometimes you can find boxes from medical equipment there too. Cleaning off the factory-baked paint wasn’t easy, and this machine changed its face several times before I finally completed it.

As always, some things could have been done better.

















Monday, July 6, 2026

Eventide Phaser

 


Here is some Schematic for Eventide Phaser i found somewhere ,have not tried to build this however ,a friend built the clock circuit on a breadboard and said it's not working .Anyway to mock up a high freq clock circuit is not so hard ,it would be amazing if the rest of the schematic is correct and working .

Tuesday, June 30, 2026

Groove Box

 




before the wiring


Saturday, June 20, 2026

Hagiwo Sampler Drum


Sampler Drums PCB

This is a second version of a PCB for this module , the first version i made was closer to the original Hagiwo module ,while here using a summing circuit both Pitch and Bank Select have active mixing of Manual  Control and CV ,to keep things simple i left Select Sample as passive mixed input , now using only 3 x Analog inputs of the ESP32C3 protected with 1N60P . 
 

Monday, June 15, 2026

Groove Box (ЏУМБУШКУТИЈА)

 


Here is the enclosure for the new Groove Box on it's way . It was hard work to peel of the baked paint . I will not disclose now it's features ,as i wait for a few remaining PCB's from China . I hope this build goes smooth and i keep this machine longer then it will take to record it properly .

Sunday, June 14, 2026

Studiomaster SESSIONMIX822

 


I rarely buy gear , so rare that nowadays i write the companies like Studiomaster ,Xvive ,and whoever before i buy something .So the people at Studiomaster after answering my query said that i can review this piece of gear . I bought it myself and here's what i think about it .


I am not audio engineer so i really can not speak all in dB and Hertz but i can give honest view and ear on the machine , i did go to SAE for a few months but i never graduated so i know nothing ... 


One thing that led me to this mixer for start is that Mic and Line inputs were separate for each channel, that was very important for me ,and something i prefer .and two aux channels unlike all the mixers in that price range that usually offer just one.


There are compressors on all 6 channels and I would like to test the compressors with premixed inputs and various sources  ,they really are a attractive feature and at first glance they sounded more like sound leveler than true compression until i pushed them all the way and there it was, a nice interaction . 

 I know the mixer is sort of a utility box for many ,and it will be set and forget but i like to treat it like an instrument and it's very good for that . One fantastic feature this mixer has is not only the great effects and the dedicated fader for the DSP but also the ability to turn off and on the Effects ,like an Effects mute . 

When it comes to the EQ's they are sort of very vanilla , they are just 3 band EQ's without sweep and gain controls separate which i loved with my old Fostex DMT8 , so for the price you can't ask for more . External EQ is needed if you want real thump or squeak but they do the job nicely for commoners .




 I still like the mixer .Actually it's layout is just what i would like or imagine !


It has mute on each channel which is important for live sessions , and the submix* is more than welcome for no input mixing as a 3rd aux channel , yes there are 2 x aux channels which is important if you wanna use external effects and stuff and more important if you wanna record some no input mixing experimental mambo jumbo . The onboard effects have dedicated pot per channel next to the aux 1 and aux 2 and sound beautiful ,i will only say that and it's nice that there is a proper effects processor included for the price , i can imagine it being very useful feature in Live Events situations , like amateur Theater or Poetry reading.


With the compressors and the additional gain preamps on the top of the mixer this thing has a lot of gain at least for me using synthesizer levels i never touch the preamps at all . 


Sadly there is no separate return channels for the 2 auxiliary outputs but a single stereo return and whatever that is is not talking well with my Polymoog Resonators which tells me i might need to adapt a cable for normal use . (There really is a User Manual:)


Lastly there is an mp3 player there , i wish it was just some picture of Phil Collins, i could live with that , you can just ignore the whole mp3 module , unless you are at a live event like a gallery or some book publishing event or everywhere else where you'd need music before and after some strange lady reads her semi erotic poem with a big white hat with purple ribbon


You have Group 1+2 as a linked stereo bus (Group 1 = L, Group 2 = R)

Each channel has a routing switch that sends signal to both groups at once

Then you get fader control over Group 1/2 output level ,So functionally, it’s less like:

“true independent subgroup routing”  and more like: “alternate stereo mix bus with per-channel assign”


But i can imagine those two outputs being properly abused in no mixing input session .You can also have alternate mix going thru a processor and then feeding it back to another channel or recorder , and then you can give to two people two variants of the recording..


There is proper RCA record output and i am yet to test it with a portable recorder ,i thought the Record output has it's own proper Attenuator or Gain potentiometer and that would be useful when feeding these cheap portables like H1n or XV1R ,or anything semi professional really but no , there is however Control Room gain potentiometer that might do the same job . I would hate to use additional attenuator with the Portable Recorder ..but budget dictates compromises . 

Conclusion. Yes, for me it is worth every penny. Companies keep cutting corners and features at this price point, yet this thing still manages to pack quite a lot inside. you get a lot of features that some might find useful , some less , but it's really worth as base for a small budget studio . 







I hope to update this article in the future with few no-input mixing recordings .



https://studiomaster.com



Tuesday, June 9, 2026

Tuesday, May 26, 2026

ooaaauuu

 


Monday, May 25, 2026

Electro Harmonix Sonic Boomer

 I found this schematic and layout many years ago and i even made PCB for this but never built it , so when i tried to find again the layout and schematic on line there was none , or just hard to find so i decided to share it here . This is not my layout ,and i have not built it , but reading the comments elsewhere this is a very nice Kick drum .






BOM : 

---------------------------------
| Electro-Harmonix Sonic Boomer |
|        Component list         |
---------------------------------


Sorted by name
--------------

R1 47
R2 10K
R3 3.3M
R4 3.3M
R5 390K
R6 43K
R7 220k
R8 9.1k ???
R9 1M
R10 68k
R11 47k
R12 47k
R13 1M
R14 100k
R15 10k
R16 10k

C1 0.001
C2 100 EL
C3 10 EL
C4 0.0039
C5 1 EL
C6 4.7 EL
C7 0.0047
C8 0.0047
C9 4.7 EL
C10 0.0047
C11 0.0047
C12 1 EL

P1 1M log
P2 1M lin
P3 1M log dual gang

D1 1N4148

IC1 TL064

SW1 DPDT

X1 Electret microphone






Sunday, May 17, 2026

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 Few more layouts are available at https://synthesizerunderconstruction.blogspot.com , i updated the Buchal 106 PCB layout with dual layer smaller PCB  .There is now PCB layout for 3 Band Moog Parametric Equalizer  . As i am building a new DIY mixer i decided to include few DIYRE Color modules like Distortastudio  and FA38 from Trident Consoles . There is a new layout for Vintage Serge VCO , and  updated the layouts for Buchla 194  ,and the MOTM Yamaha GX VCF for which i finally got the PCBs.








Friday, May 15, 2026

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( 9sjS )9JoZX )aIA )ajS DF09Ka9SA0D)aKS9

 

Monday, May 11, 2026

Chiruru



Saturday, May 9, 2026

Moog Parametric EQ

 







Many years ago i built the ACX Moog Parametric EQ and it was working fine , so i just saw now the original Moog 3 Band Parametric EQ .This is a striped down version without the switch .




This Moog Parametric Equalizer uses somewhat unusual potentiometers-dual 50k/500R





Thursday, April 30, 2026

the drawing board

 


Buchla 106 Mixer updated layout






FA38 Colour 





Monday, April 27, 2026