DIY eurorack modular synth | MOD2 Claves : RP2350 based drum module

video upload by HAGIWO

"This module is an open source general-purpose Drum module based on Seeed XIAO RP2350.
Thanks to AI-friendly hardware design, it's easy to create software variations using generative AI.

With general-purpose components and a simple circuit, this module is affordable and DIY-friendly.

Claves:
A simple claves sound source.
The waveform mixes sine and triangle waves at an arbitrary rate.
The pitch CV follows the V/oct.

working documents
https://note.com/solder_state/n/nce8f...
https://note.com/solder_state/n/ne976...

PCB gerber data & PCB assy production data Download
////In preparation (scheduled to be uploaded to Patreon)////

Please support me to continue projects.
In patreon you will find content about my background , technical information.
/ hagiwo

-------------------------------------------------------------
Repository of HAGIWO's DIY Modular Synth
https://note.com/solder_state/n/n54e0..."

DIY eurorack modular synth | MOD2 Kick Drum : RP2350 based drum module

video upload by HAGIWO

"Thanks to AI-friendly hardware design, it's easy to create software variations using generative AI. With general-purpose components and a simple circuit, this module is affordable and DIY-friendly.

Kick:
Sin wave base , 6 parameters kick drum.
Pressing the button will change the assigned parameter.

working documents
https://note.com/solder_state/n/nce8f...
https://note.com/solder_state/n/nbdea..."

MOD2 Prototype test | Seeed XIAO RP2350 based Drum module for eurorack

video upload by HAGIWO

":Almost all of the programs were generated by ChatGPT.
Since the circuit has been simplified, there are few CV inputs and the audio is output via PWM, but the RP2350 is fast enough that even a simple program can produce reasonably good sound.

Although there are no plans to use it as a VCO, it also supports V/oct.
-------------------------------------------------------------
Repository of HAGIWO's DIY Modular Synth
https://note.com/solder_state/n/n54e0..."

DIY eurorack modular synth | MOD1 Square VCO & 3ch LFO : Arduino based general-purpose module

video upload by HAGIWO

"This module is an open source general-purpose CV/Gate module based on Arduino nano. It can be applied to various CV/Gate modules by changing the program. There are some performance limitations, but it uses general-purpose inexpensive components.

Square VCO:
Audio output operation is somewhat unstable and produces a noise sound.

Square wave oscillator with V/oct support.
LFO for vibrato and octave like chiptune.
The capacitor in the D11 output circuit needs to be removed."

DIY eurorack modular synth | MOD1 3ch LFO : Arduino based general-purpose module

video upload by HAGIWO

"This module is an open source general-purpose CV/Gate module based on Arduino nano.
It can be applied to various CV/Gate modules by changing the program.
There are some performance limitations, but it uses general-purpose inexpensive components.

3ch LFO :
1 CV in , 3 CV out.3 waveform."

DIY eurorack modular synth | MOD1 Clock sync Trigger burst : Arduino based general-purpose module

video upload by HAGIWO

"This module is an open source general-purpose CV/Gate module based on Arduino nano.
It can be applied to various CV/Gate modules by changing the program.
There are some performance limitations, but it uses general-purpose inexpensive components.

Clock sync Trig burst :
When POT3 is turned fully left, it accepts an external clock for F1.
When POT3 is to the right of 9:00, it switches to the internal clock.
The internal clock can be adjusted with POT3.

working documents
https://note.com/solder_state/n/nc05d...
https://note.com/solder_state/n/n59f6...

PCB gerber data & PCB assy production data Download
https://www.patreon.com/posts/mod1-ar..."

DIY eurorack modular synth | MOD1 Random CV sequencer : Arduino based general-purpose CV/Gate

video upload by HAGIWO

"This module is an open source general-purpose CV/Gate module based on Arduino nano.
It can be applied to various CV/Gate modules by changing the program.
There are some performance limitations, but it uses general-purpose inexpensive components.

Random CV sequencer : Periodic random CV sequencer.

working documents
https://note.com/solder_state/n/nc05d...
https://note.com/solder_state/n/nd2af...

PCB gerber data & PCB assy production data Download
https://www.patreon.com/posts/mod1-ar...

Please support me to continue projects."

DIY eurorack modular synth | MOD1 Tap tempo clock : Arduino based general-purpose CV/Gate module

video upload by HAGIWO

"This module is an open source general-purpose CV/Gate module based on Arduino nano.
It can be applied to various CV/Gate modules by changing the program.
There are some performance limitations, but it uses general-purpose inexpensive components.

Tap tempo clock : 4-output tap tempo master clock.
Four outputs: 4x fixed output, 1~16x variable output, and two variable 1~/16 division outputs.

working documents
https://note.com/solder_state/n/nc05d...
https://note.com/solder_state/n/nf004...

PCB gerber data & PCB assy production data Download
https://www.patreon.com/posts/mod1-ar..."

DIY eurorack modular synth | MOD1 Envelope generator : Arduino based general-purpose CV/Gate

video upload by HAGIWO

"This module is an open source general-purpose CV/Gate module based on Arduino nano.
It can be applied to various CV/Gate modules by changing the program.
There are some performance limitations, but it uses general-purpose inexpensive components.

Envelope generator : 3-output EG. end-of-cycle outputs can be self-patched for use as LFO or clock

working documents
https://note.com/solder_state/n/nc05d...
https://note.com/solder_state/n/n7499...

PCB gerber data & PCB assy production data Download
https://www.patreon.com/posts/mod1-ar..."

DIY eurorack modular synth | MOD1 Euclidean sequencer : Arduino based general-purpose CV/Gate

video upload by HAGIWO

"This module is an open source general-purpose CV/Gate module based on Arduino nano.
It can be applied to various CV/Gate modules by changing the program.
There are some performance limitations, but it uses general-purpose inexpensive components.

Euclidean sequencer: 8step or 16step sequencer. Adjustable output probability and number of hits.

working documents
https://note.com/solder_state/n/nc05d...
https://note.com/solder_state/n/n4284...

PCB gerber data & PCB assy production data Download
https://www.patreon.com/posts/mod1-ar..."

DIY eurorack modular synth | MOD1 LFO : Arduino nano-based general-purpose CV/Gate module

video upload by HAGIWO

"This module is an open source general-purpose CV/Gate module based on Arduino nano.
It can be applied to various CV/Gate modules by changing the program.
There are some performance limitations, but it uses general-purpose inexpensive components.

LFO: 3CV in - 1CV out simple LFO.

working documents
https://note.com/solder_state/n/nc05d...
https://note.com/solder_state/n/ne91e...

PCB gerber data & PCB assy production data Download
https://www.patreon.com/posts/mod1-ar..."

[$18] DIY eurorack modular synth 山景DSP FX Pitch Shifter & Reverb | BP1032 based

video upload by HAGIWO

"My 84th original eurorack modular synth DIY projects.
BP1032 DSP Reverb module from China based FX module.
Effect types and parameters can be changed using PC software called APCWrokbench.

working documents (schematics)
https://note.com/solder_state/n/nba86...

Sound test videos for other effects and parameter changes (patreon)
https://www.patreon.com/posts/shan-ji...

-------------------------------------------------------------
Repository of HAGIWO's DIY Modular Synth
https://note.com/solder_state/n/n54e0..."

Module description, Google translated:

Background
The 84th work of my own modular synth.
There are many suspicious circuit modules on sale on Aliexpress whose purpose is unknown.
Depending on your idea, you can easily create original modules at low cost.
This time, I planned to create a Pitch Shifter using such a suspicious and attractive Chinese module.

Pitch shifter
A pitch shifter is a type of effect that raises or lowers the frequency of the input sound. By layering 5th or octave sounds, you can create a thick sound.
There are also several Pitch shifter modules on the market for modular synths.

Specifications of the work
Eurorack standard 3U 8HP size
Power supply: 50mA (+12V), 10mA (-12V)

Pitch shifter module using BP1032 DSP IC manufactured by Mountain View Silicon, a Chinese semiconductor manufacturer.
The amount of pitch shift is fixed. In my case, I use it at a perfect fifth (5th).

DRY POT: Adjusts the DRY volume
WET POT: Adjusts the WET volume
INPUT LEVEL: Adjusts the input signal. Adjusts the input level to accommodate ±5V of modular synth sound and general line level.
OUTPUT LEVEL: Adjusts the output volume
Signal IN: Audio input
L Out: Left output. Not used with Pitch shift, but valid when the Reverb effect is selected.
R Out: Right output. Not used with Pitch shift, but valid when the Reverb effect is selected.
The biggest drawback of this module is that it does not have an interface for the applied effects or effect parameters on the front panel.
You can adjust the effects and parameters by connecting it to a PC via USB C.
In addition to being a pitch shifter, it can also be used as a reverb or delay depending on the settings.
ACPWorkbench
To switch effects, use PC software called ACPWorkbench.
This software is made in China and is of questionable origin, so use at your own risk. My PC's antivirus software did not detect any viruses, but I don't know if it's safe.

[$9] DIY eurorack modular synth Arduino Unison VCO w/ Seeed XIAO RA4M1

video upload by HAGIWO

"My 83rd original eurorack modular synth DIY projects.
Seeed XIAO RA4M1 based Dual Oscillator VCO.
You can create a thick sound by using detune or adding a 5th.

working documents (schematics , code)
https://note.com/solder_state/n/na0ae...

Python program for wavetable generation , Additive , FM and PWM duty. / 114675733

Seeed XIAO RA4M1
https://www.seeedstudio.com/Seeed-XIA..."

"Specifications

Eurorack standard 3U 6HP size

Power supply: 10mA (±12V), 20mA (5V)

2-oscillator digital VCO using Seeed XIAO RA4M1.

Supports V/oct, and the waveform can be selected from 16 types of wavetable.

The frequencies of OSC1 and OSC2 are always in a relative position relationship, and detune and overtones can be added by shifting the frequency of OSC2.

OSC1 FREQ POT: Adjusts the reference frequency of OSC1 and OSC2
OSC2 FREQ POT: Adjusts the frequency of OSC2 relative to OSC1. Can be set from 0 oct to 2 octs above.
OSC2 volume POT: Adjusts the volume of OSC2
OSC2 volume CV in: CV input for adjusting the volume of OSC2
Wave push SW: Selects the wavetable. 16 types in total.
V/oct IN: V/oct input, range is 0~5V.
OUT: Audio output, range is Vpp10V.

The selected waveform information is stored in EEPROM. When the power is turned on again, the last selected waveform is selected."

Seeed studio XIAO RA4M1 simple Arduino synthesizer : VCO for eurorack modular synth

video upload by HAGIWO

"Modular synthesizer VCO. using Seeed studio XIAO RA4M1.
Supports V/oct and audio output via built-in DAC.
This is an improved version of the UNO R4 VCO created in the past."

https://note.com/solder_state/n/n76a6b0a4a5d6

From Japan to Your Rack : #3 centrevillage CosmosQuencer +GATEM +ECQ|Japan's eurorack modular

video upload by HAGIWO

"Introduction to a modular synthesizer made by a Japanese garage manufacturer.

centrevillage https://centrevillage.stores.jp/

The modules from Centrevillage incorporate many useful features into a small size, and they're also affordable. Although the small size makes operation a bit tricky, the effective use of LED indicators ensures good visibility, which I like.

Cosmos Quencer : make melody line GATEM : make3ch euclidean rhythm for percussion ECQ : euclidean rhythm for bass CLKM : master clock"

See the Centrevillage label below for additional posts.

[$5] DIY eurorack modular synth Low pass gate for percussin | with cheap vactrol made in China

video upload by HAGIWO

"My 82nd original eurorack modular synth DIY projects.
Low pass gate for percussion sound.
Cheap, mass-produced vactrol LCR-0203 from China is used.

working documents (schematics)
https://note.com/solder_state/n/n4f1f...

Comparison of Attenuation Characteristic Curves for vactrol made in China
/ 109954005

Please support me to continue projects.
In patreon you will find content about my background , technical information. / hagiwo

-------------------------------------------------------------
Repository of HAGIWO's DIY Modular Synth
https://note.com/solder_state/n/n54e0..."

DIY modular synth jam #9 | Practice techno with the Arturia BeatStep Pro

video upload by HAGIWO

"Yeah, I definitely need more practice with playing, but I can't help it because building modules is just so much more fun."

Repository of HAGIWO's DIY Modular Synth

From Japan to Your Rack : #2 Sdkc Instruments Helical + Addition | Japan's eurorack modular synth

video upload by HAGIWO

"Introduction to a modular synthesizer made by a Japanese garage manufacturer.
Sdkc Instruments Helical
https://github.com/SdkcInstruments/He...

16-voice polyphonic synthesizer with automatic sequence generation.
With stereo output, it can easily create ambient sounds when combined with an FX module.
In Japan, it is becoming a popular module like "Rings to clouds." When combined with a VCF, it is also a versatile module capable of producing acid techno."

Geo-Gruven from Synthetic Sound Labs

video upload by NOISEBUG

"The 2655 Geo-Gruvn is a six channel, 16 step Euclidean rhythm / gate sequencer for Eurorack modular synths in only 6 HP.

Geo-Gruvn is inspired by the brilliant efforts of Japanese designer Hagiwo, and produced by SSL with kind permission. SSL has also significantly enhanced the hardware and software leading to better performance and improved functionality.

Each of the six output channels allow adjustment of:

Hits – The number of outputs generated, with Euclidean spacing.
Offset – Changes the starting point for the Euclidean sequence.
Length – The number of steps for this channel before resetting.
Mute – Turns on/off all outputs of the selected channel.

A single rotary encoder allows uncomplicated selection of channels and functions with simple visual feedback provided by a bright blue OLED display.

In addition to its extensive Clock / Sequencing related duties, Geo-Gruvn can respond to Clock inputs well into the audio range, making it a convenient 6-channel frequency divider.

A Pattern Memory screen allows non-volatile storage for up to 8 pattern sequences.

The Geo-Gruvn features a bright OLED display, clock and reset inputs, 6 gate / trigger outputs, a rotary encoder for selecting functions, and an eight Pattern non-volatile memory. All inputs and outputs are standard 3.5mm phone jacks with an associated LED panel indicator.

Power is supplied by standard 10 pin Eurorack power header.

Quality, solder-masked, fiberglass-epoxy printed circuit boards and meticulous hand-crafted assembly assure years of trouble-free service.

https://www.noisebug.net/products/syn..."

Stunning DIY VST Controllers by Craigyb

This one is in via Florian Anwander via the Sequencer.de forum.

According to the creator of these controllers, Craigyb:

"So when I was 16 (around 45 years ago) I used to dream of the Arp Quadra. A friend of mine who wasn't a keyboard player, but just wealthy bought one and it was sat in his front room doing nothing unless I could call around after school and have a play on this great synth.

Now I know I could probably afford to buy one, but the wife would kill me quicker than the Russians, so instead I took Cherry Audio's VST of the Quadra and created a physical beast with a PC built in to create sounds.

I then followed that up with a synth that I've never met in real life AFAIK but is also quite legendary, the Elka Synth (again a VST emulation by Cherry Audio).

I'm currently working on the Memory Moog version (MemoryMode by Cherry Audio) and I just need to finish the actual hardware as the software controller is complete."

Further below are a few more creations from Craigyb in a separate thread on the Sequencer.de forum here.

"This is a small collection of some of the real synths and accessories I have built over the last 4 years.

Details of most of the schematics and code can be found on my GitHub page http://github.com/craigyjp

A Roland A110 clone
Rack version of a VA polysynth with extras
A rack version of the MiniDexed
A Dual DCO monosynth based on Hagiwo VCO
6 voice polysynth based on the Polykit
16 voice bitimbral rack mount
FV1 based rack mount effects with memory
Gligli Prophet 600 clone with extras
Mellotron sample playback synth
Source inspired monosynth with memories
8 voice poly again Hagiwo DCO based
A 6 voice VCDCO based poly with memory
Dual XVA1 synths and editor in one keyboard
A MIDI analyzer/converter/injector USB and DIN
Roland MKS30 display upgrade to OLEDs
Arturia CS80v editor/controller
OSC Oscar Clone"

CLICK FOR MORE »

[$11] DIY eurorack modular synth SSI2131 VCO | analog oscillator

video upload by HAGIWO

"My 79th original eurorack modular synth DIY projects.
SSI2131 IC based analog VCO.

working documents (schematics)
https://note.com/solder_state/n/nf478...

Additional information about SSI2131 VCO module
https://www.patreon.com/posts/1054345...

Please support me to continue projects.
In patreon you will find content about my background , technical information.
https://www.patreon.com/hagiwo"