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 : 

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| Electro-Harmonix Sonic Boomer |

|        Component list         |

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Sorted by name

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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

***

 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.

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

the drawing board

 

Buchla 106 Mixer updated layout

FA38 Colour 

in case you missed this...

 

   

Serge '73 VCF ,original layout from Serge ,using 2 x CA3080 , i cleaned up this layout to my taste and build this filter using this ..twice ,little tip : if you're using this layout and don't have a metal can CA3080 you can use that chip in SMD with adapter ,using CA3080 in TH can be hard ,this one and few other original layouts from that Serge system can still be found at the wayback machine . Here is Gerber files for this interesting filter , you can see i did not completed the silkscreen since the original documentation contained that information .

This information was already online ,contact me if i need to remove it from this google website .

SynthesizerUnderConstruction

 Here are links to my other blog . These are all tested working layouts . If you can buy the kit ,it's easier but if you have a few spare parts and need a specific project maybe it's here : SynthesizerSecrets 

SIAM (Siemens Inspired Equalizer )

Preamp and Envelope Follower ( By Juan Bermudes Costa)

Thomas Henry 555 VCO (Slim Version)

Crossfade Panner (Buchla Based)

Experimental Hardware Neurons (By Grant Richter)

Non-Linear Circuits Primal Hyperchaos 

Non-Linear Circuits Jerk

Non-Linear Circuits SPasm

NLC Neuron/Grant Richter's CV Twister

CGS95 Reverb

Serge n-Step Programmer/Sequencer

Buchla Low Pass Gate/Envelope Follower

Serge Wavemultiplier/Overdrive 

Paparail's VC AUX

Hagiwo's Addive VCO

Serge SSG/Bazier CUrve

Serge Triple Glide

Buchla 194

Yamaha GX BPF

Frequency Shifter

  This is yet another untested layout . I made the boards for this and even collected the parts ,but have not completed yet . I found this schematic at Henry's Electronics web page . There is not much information on line other then that sadly as well as no other reported builds . The frequency shifter there contains also a Sine/Cosine VCO and i decided to use another Quadrature VCO for this purpose ,so in that sense this is uncomplete . I made two layouts ,that is for the Dome Filter and the Ring Modulators & Summing Mixer .One of the boards is double layer ,while the Ring Mods board is single layer with a number of jumpers .Normally you would want to match the caps in the Dome filter as closely as you can .This is set up in such way that you would use the +/- 5V from the Ring mod board and connect it to Dome filter board ,other than that both boards are connected normally to +/-15V

 

links to original post and gerbers here : https://synthesizerunderconstruction.blogspot.com/2024/12/frequency-shifter.html

links to original project by interesting henry's electronics : https://www.interestingelectronics.com/old/henrys_interesting_electronics/henrys_exciting_electronics_contents.htm

Synthesizer Secrets

 https://synthesizerunderconstruction.blogspot.com

I made a new Blog Page ,is this end of life for this one . Over the years i made more then few PCB layouts ,and many of them were built ,tested ,modified ,so it kind of itches to place them in one directory ,like a schematics vault ,or a modular synthesizer ,so i found a layout that is working good for this purpose ,this documentation is free to download along with gerber files . Music and pretty pictures are not hosted here but i hope the list of modules will grow as i need to revisit some of the earlier layouts i made . Most people will just go and buy the kit and this is if you think you might save a few bucks . Here's the link :

voltage scrambler

 This is not an attempt to design a module ..still the ideal diode tutorial from Jim Patchel inspired me for this module ,i was gonna make a panel that featured few of the examples he gives in the tutorial ,and so i even draw this schematic combining 3 simple modules . As in the basic ideal circuit from Patchel's site this module has one input and one break cv input .At the outputs you get 2 different voltages derived from the input voltage and the break voltage input ,these are later fed into 2 voltage controlled glide modules originally designed by Serge ,as these fit very well as submodules cause of their simplicity ,and finally the slewed voltages coming out of the glide submodules are mixed with single cv processor also originally designed by Serge . I find it interesting cause the two upper and lower parts can be inverted with the processor . I am not sure if this would make sense in a modular ,as i have not built it yet ,however i have built a waveshaper based on the ideal diode circuit and that is working fine .

 

 

 

 

 

pcb layout for this module ,made to fit 2 x LCR Vactrols

пцб

 

untested!

yamaha bpf

 

old crow's yamaha bpf - verified working pcb

nlc spasm

 

( verified ,working pcb )

Serge n-step programmer sequencer

 

top

pcb

parts

bottom 

( verified pcb )

8KLFO

 

This is the 8KLFO from Magic Smoke hosted at electro-music ,it has tri and square outputs plus a wave output ,in this layout one of the shapers can be modulated with cv using a vactrol and manually with 100K potentiometer with +/- 15V ,the vactrol part is borrowed from NLC's Low Pass Gate as it works good with LCR0202 vactrols ,that is for the ramp/tri waveshaper ,the sync addition is included ,i meant to add a gated delay but that is not included here .This is untested layout .

CHAOS

 

by Ian Fritz ,untested!

 PCB Layout here at Synthesizer Under Construction

*

 

MYSTERY WAVESHAPER

Oscillator

Ian Fritz's multiphase vco http://ijfritz.byethost4.com/sy_cir11_68phase.htm ,i hard wired it as 6 phase vco ,this is still untested  ,and i can not confirm this layout at the moment 

it's funny how in not overcomplicated circuit like this i didn't spot little error ,

so this is rev3 ,and i need yet to verify this layout  

 

 

ARP Quadra phaser (J. Haible)

 

sadly i could not get this one to work , i spent lot of time tracing the bad print layout from Jurgen Haible

Experimental Hardware Neurons (G. Richter)

 

tested, working!

TRAPEZOID

 

https://synthesizerunderconstruction.blogspot.com/2025/01/emsjhaible-trapezoid-function-generator.html