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Do It Yourself

My Modular Synth




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pcb SEM error - 12/09/2019 - 13:59

Thanks to "SpoutnickStudio" to detect an error on the SEM pcb.

Due to an inversion between Q101 and Q104, you have to cut tracks near the drain of both Fet and patch Q104 drain to node R129, R131 and patch Q101 drain to node R141 R113. I apologize for the inconvenient.

Mini Drum Modular - 08/10/2018 - 13:53

Here is my contribution to drums instruments. It's a module with 7 instruments with external trig ( sequencer, LFO,) Each instrument has its own output and there is a general Mix. You will find all the elements in the item below and a pcb in the shop.

New URL - 18/06/2018 - 09:36

Please note the new URL of this website : thanks

New Shop - 19/05/2018 - 19:27

Setting of printed circuit board sales. Only few circuits are available, This will depends on the demand. 

At least the VCO Companion - 22/10/2017 - 22:04

This companion will bring to the VCO-Extra the Square frequency : F/4, F/2, F/3, 2F/3, and 3F/2

And with Triangle and Sine : F/2 and F/4.

some new little things... - 22/10/2017 - 21:27

VCO Extra : Change in the file to be adapted to the futur Companion circuit and availability of professional double side pcb.

CV Offset : New release with pcb.

VCO-Extra - 31/05/2017 - 21:40

Scanner - 13/03/2017 - 21:45

Finally the scanner is ready. This new circuit as can do a pan but with 4 inputs morphs sucessively the 4 inputs with a manual control or a CV (+-5V). You can watch 2 videos on 2 possibilities of use between several.

Little Sequencer - 28/03/2016 - 18:43

This litte sequencer allows up and down counting in 2*8 or 1*16 mode. See the new item for full specs.

Input Follower - 30/01/2016 - 22:52

A Small amplifier followed by an envelop detector and 2 gates generator.

Quad-Quantizers - 25/01/2016 - 21:17

Still an other module for DIYer, a four voices quantizer with the idea of building from 1 to 4 voices, as you like.

Filter bank - 20/12/2015 - 22:22

From the band pass filter of the SH5, then mofify to become a multimode LP,  BP, HP with gain , frquency and resonance. This filter is copy 3 times.

Spring Reverb - 20/12/2015 - 21:47

Here is my release of a classical spring reverb with ideas from "Elliot Sound product". Very usefuil fo our modular synth.

DigiNoise - 16/08/2015 - 22:12

Here is a pseuso random digital noise generator with a filter to give him some color then a low pass to give a random control voltage.

A 440 Hz ref - 09/08/2015 - 20:15

A useful 440 Hz reference.

Dual VCO VCAmixer improvement - 04/02/2015 - 12:01

Thru improvement in the range and deletion of this ugly output capacitor

Clipper/rectifier - 12/01/2015 - 12:12

From  Stephen ( idea first then I cloned the Q130 from This module less famous allows rectifying and  clipping signal (positive, negative, both). For application see dot com site. I recommend the book  :  IC Op-Amp Cookbook from W. JUNG which help me.

See article.

Lay out files for 960, 962, and gate bus have been improved. A correction has been made on In/Out pcb.

Thanks and Happy new years to you all guys smile

Dual Lag Processor - 28/12/2014 - 13:05

Here is a pcb for the "Harry Bissel" schematic. This board provide 2 processors which can be used as a portamento, a glide, a gate slew...Rising and falling edges have independant control and the response can move from linear to logarithmic.

Dual VCLFO - 18/09/2014 - 19:26

Hello here is a great classical : a VCLFO from the FORMANT ELEKTOR. In addition to the voltage control for the frquency you will find an input Reset which could be use to synchronize the 2 LFOs.

Shapes available : Triangle, Square, Sine and Slope + Ramp at the double frequency.

2 waveform generators - 19/07/2014 - 17:55


I have extract the wave generator from the VCO Kobol and adapt it to a standard Saw +5V-5V as input. With one output we get all the classical waveforms triangle, saw square, pulse plus a modulation Cv.


Double pulse waveform generator

This one is coming from I. Fritz : . I did some light modifications and adapt it to a +-15V supply. It needs a triangle as input. The purpose of these generator is to bring some even harmonics which are not so present in our classical waveforms.

SEM Filter - 19/07/2014 - 16:31

Here is a filter which is not in the Yusynth collection : the SEM filter from Tom OBERHEIM. It 's a state variable filter 2 poles using JFET as buffers in a reverse position as a source follower.

It 's a copy but not a true one from purist point of view because I didn't use the original component as AOP 301, 741 or JFET.

Sub-Octaves - 15/06/2014 - 18:21

My new sub-octaves module with several choices in term of frequency and waveshape for the ouputs.

VCo Add-on - 15/06/2014 - 18:14

A new small add-on for VCO. A wave mixer with modulation. This is not wave morphing just a mixer made with a VCA.

An easy dual Quantizer - 27/04/2014 - 16:41

Cherry on the cake to follow the Moog sequencer. This easy Quantizer with no PIC only discrete componentsbiggrin

Last small one for the 960 - 17/04/2014 - 12:44

As it was due. Here is the "Gate Bus " for sequencer MOOG 960, which allows to distribute the 8 gates on 2 busses.

I have made an add-on to the ADSR Yusynth to add 3 features :

  • a Gate LED
  • An input "Retrigger"
  • An output signal 0-5V :"DSR Phase" with a LED.

These 3 functions are wholly independant !

Pedal Switch - 14/04/2014 - 16:17

Here is a GATE or a TRIGGER, triggerered by a push or a pedal NO. Usable for ADSR, Sequencer, delay...... 

Clone Moog Sequencer 960 - 17/03/2014 - 12:30

I had a dream so I did it : the MOOG sequencer 960. After a long period of study it's alive. I have added a Reset mode on stage 1 to 7 and a clock output with variable PW from 90% to 10%.

WARNING : This project can be realized by an hobbyist but needs patience  and be meticulous mainly for the wiring. It's made with 4 boards.

The schematic become a bit complicated because I wanted to get robustified input output. 

Clone Moog 962 - 15/03/2014 - 19:08

Here is a new module : the sequential switch clone of MOOG 962. As you may know it was used to chain the 3 sequences from the "Sequencer 960".

As additional features you can push a sequence every two passes and the in and out can be reversed.

Waiting for more to come coolsmile