"We're so excited to share with you the new Q108 Amplifier DIY KIT!!
The Q108 Voltage Controlled Amplifier is a staple of any synthesizer system.
The amplitude of any waveform can be controlled by another signal such as an envelope generator, sequencer, oscillator, etc.
An Initial Gain control allows manual adjustment of the amplitude and a Level Control determines the impact of the control signal.
Both Linear and Exponential responses are available to simulate a variety of real-world sounds.
Positive and negative output signal polarities are provided.
"Project Link: https://github.com/GuitarML/GuitarPed...
Walkthough of my custom STM32 based digital guitar pedal. I give an overview of the features, and then dive into the project hardware and software. I also show a demo of the included Reverb/Delay.
00:00 - Pedal Features
4:25 - Open Source Project Overview
5:58 - KiCad Schematic
10:35 - KiCad PCB layout
16:55 - STM32CubeIDE and code
23:05 - Reverb/Delay Effect Demo
"In this video, I’m giving you a quick update on what I’ve been working on over the summer and showing three new projects that have recently made their way into my Eurorack setup.
🎛️ First up is kefir, a simple 24HP four-channel stereo mixer with input normalization. I needed another stereo mixer for my 1U row, so I took one of my already proven mixer designs and turned it into a dedicated 1U utility module.
🍉 I also made a 1U version of melon. Since a 4HP Eurorack module fits perfectly into a 1U row when rotated by 90 degrees, I designed a new 22HP panel for the existing melon PCB. The module now fits nicely into my 1U row, and there are already more new firmwares in development including a port of the Mutable Instruments Elements engine.
🌱 Lastly, I completely redesigned my Daisy-based stereo multi-effects module. The new version is called carciofo and is built around the new Electrosmith Seed 3. It is only 6HP wide and adds two buttons and a WS2812B RGB LED for a much more flexible interface.
For this video I’m also taking the new Quattro firmware for a spin, which puts drive, chorus, delay and reverb behind the four knobs."
⏱️ Chapters
00:00 – Intro
00:03 – Coming Up
00:19 – Kefir: 1U Stereo Mixer
00:50 – Melon goes 1U
01:42 – Melon Mod 303 Demo
02:30 – Carciofo: 6HP Stereo Multi-FX
03:01 – Quattro demo
04:18 – Final thoughts
"The JvR Spin F1 Formant Dual is a high-performance Digital Signal Processing (DSP) multi-effects unit designed for the DIY Elektor Formant Synthesizer system. Powered by an ATmega328P microcontroller (standalone DIP-28 package) and a Spin Semiconductor FV-1 DSP chip, this module architecture bridges old-school analog synthesis with modern digital studio effects.
"Modular Town — a synthesizer town, drawn by hand.
Modular Town is a single Amorph instrument: a hand-drawn village you scroll through, where every knob, step-sequencer and jack is mounted on a building facade wired by hand, just like real hardware.
🏭 Filter (Cutoff/Resonance) on the factoryVCO1 / VCO2 on the vending machinesDetune and Attack/Decay/Release tucked into the houses🥁 A 16-step drum machine (Drums Volume, Accent, Drive) running through its own sequencer🍜 Ramen Bass Shop, a mono bass synth with its own 16-step piano roll, playable live or sequenced. A day/night cycle you flip from a shop sign. Delay (Time/Feedback/Mix) on a canal-side wall. A full patch panel route LFO, ENV and random modulation across the whole village with real cables✨ Reverb, aged-paper texture and film grain for a sketchbook feel"
It started as a simple synth-tom experiment, but gradually evolved into a much more flexible percussion synth capable of producing deep kicks, toms, short noisy hits, laser-like sounds and all kinds of strange electronic percussion.
RudeBox is played dynamically from an external drum pad, with hit velocity affecting the generated sound. Its controls allow shaping the oscillator, pitch envelope, amplitude decay and transient click/noise:
• *Novation Bass Station II* — bass / synth lines • *Korg Volca Sample* — additional drums and samples • *Allen & Heath ZEDi-10* — mixing everything together
The idea behind RudeBox was to build something simple, immediate and playable rather than another menu-driven digital instrument. Despite running on an ESP32, it behaves much more like a small piece of dedicated hardware: plug in a pad, turn the knobs and play.
"Meet the keypad version of Samplotron — my DIY hardware sampler and loop player built around the ESP32.
In this demo I’m using Samplotron to trigger samples and loops live. Some of the sounds are my own recordings, while others come from publicly available sample sources.
What you hear is the direct audio output from Samplotron — no post-processing, EQ, compression or additional effects were added to the recorded audio track.
You can also see another one of my DIY projects in action: a small oscilloscope I built, displaying the audio waveform in real time.
DUCKTRONIC has made a ROM Expansion currently compatible with Oberheim DX and Linn drum machines. You can find the user manuals for each on a Google drive here.
The following is the intro in the DX manual:
"The ROM EXPANSION extends the Oberheim DX with 104 sounds, most of which originate from the early 1980s. This makes it possible to recreate the sound of drum machines from that era. It is also possible to save custom-assembled soundsets and load them again at a later time.
Installation requires the CONTROL BOARD with the "Sound Control" software, the CONTROL PANEL, and six EPROM BOARDS with EPROMs. If only individual instruments are to be modified, fewer EPROM BOARDS are required accordingly.
Installing the ROM EXPANSION does not require any mechanical modifications or irreversible changes. The original state of the Oberheim DX can therefore be restored at any time."
"This is a diy analog digital 8-voice paraphonic synthesizer I designed and
built over the past year. It features external midi control capabilities as well
and an integrated keyboard.
"A very useful modular synthesizer utility for VCO transposition and octave switching, as well as audio and CV signal switching.
The Transposition & Patch Select module features two six-octave switch banks, a one-octave keyboard, and four independent analogue signal switches. External volt/octave CV signals can be summed with the transposition controls, making it easy to change octaves or keys while playing or sequencing without repatching. The built-in keyboard also provides a gate output and can be used on its own as a simple control keyboard.
The four analogue switches can be used to quickly change audio or CV signal routing at the push of a button, making the module particularly handy for live performance and experimentation.
Constructed using discrete logic and analogue ICs with no microprocessor or programming required.
Complete construction details, photographs, circuit description, and the full schematic are available at The Electronic Peasant: www.epeasant.com/transwitch/transwitch.html"
"Changing keys, octaves, and patches at the push of a button!
A handy utility module for volt/octave transposition and audio/CV signal switching.
Many modular synthesizer VCOs don't have built-in octave switching capabilities, which are useful for extending the range of a keyboard. Dynamically changing keys and octaves while using a sequencer is often not an easy or ergonomic process. Unplugging and plugging cables to modify a patch while playing can be cumbersome and inconvenient as well. This project provides the capability to easily and automatically do all of those things in one handy box.
The module includes a pair of six-octave latching switch banks, a one-octave switch keyboard, and four SPDT analogue switches. There is a combined output that mixes one of the octave switch banks with the keyboard output so that they can be used together, and the keyboard has a gate output included as well, so that it can be used as a freestanding keyboard. The keyboard circuit itself is adapted from Ken Stone's CGS10 Pedal board/Mini Keyboard project. Both of the octave switches and the keyboard include a CV input for precision summing of external volt/octave signals with each switch output."
1. The BOTANICA Sequencer: First Look at My New Project
0:00 Intro
2:35 What is BOTANICA
4:00 Sequencer features
12:17 Jam demo
17:29 Outro
2. Botanica: Live Demo of My Custom MIDI Sequencer
3. BOTANICA - Sequencer Prototype | Try It Now
"I've been designing and building my own midi sequencer called BOTANICA. This hardware midi sequencer creates expressive sequences from simple patterns.
In this video I tell you about how I started this project (learning electronics and pcb design), a demo of the sequencer and the project status. You can get involved by playtesting, discussing in my discord channel and stay up to date.
A first look at the Botanica midi sequencer prototype. See how this custom hardware controls generative sound design.
I have been refining the design and interface of this new project for quite a while now. This device features a custom pcb and a tactile front panel, allowing for hands-on control over complex musical patterns. It is built for anyone interested in diy electronics and the process of creating custom musical tools from scratch.
Watching the digital display react to each knob turn is satisfying. Botanica is designed to push my generative music performances further, giving me more control over the output. It is a work in progress, but seeing it come to life on the workbench is a major milestone for this modular synth project."
"BOTANICA is in prototype phase with a small group of testers. After that, the first 5–10 units get built for sale."
"A natural sequencer that grows simple patterns into whole compositions."
FEATURES Sculpt intricate sequences from 1 to 64 steps. Add, trim away, create space to add fills and variations.
TIMED PHRASES Add timed phrases and variations to from 1/2/4/8 bars to continuous chance-based evolution.
GENERATIVE MELODIES Seed melodies and dial in Root, Semitones and Range to taste. Color them with a preset scale (Seasons)
EXPLORE WITHOUT RISK Turn knobs, modulate, experiment. Dial everything back to return to your original sequence and tones.
EXPRESSIVE REPEATS Blossom adds timed MIDI repeats at varying intervals and velocity curves
TONAL OPTIONS Pattern, Arpeggiator and Chord modes
"The AI250 BXR is a eurorack module inspired by vintage nuclear test equipment. It can be used as an audio mangler, cv generator, and VCO. The BXR is a nod to vintage Boxcar Averagers, which were designed to acquire and analyze fast signals. The AI250 specifically replicates the real-time mathematical portion of a Boxcar Averager System, and processes audio or cv signals against either another signal or its internal v/o variable wave-shape VCO."
AI250 BXR Eurorack Test Equipment Build Video
video upload by AI Synthesis
Press release follows:
Portland, OR, USA September 2, 2026 – New for Knobcon, AI Synthesis has released the AI250 BXR in both a built and guaranteed version, as well as in kit and PCB/Panel format.
The AI250 BXR is a eurorack module inspired by vintage nuclear test equipment. It can be used as an audio mangler, cv generator, and VCO. The BXR is a nod to vintage Boxcar Averagers, which were designed to acquire and analyze fast signals. The AI250 specifically replicates the real-time mathematical portion of a Boxcar Averager System, and processes audio or cv signals against either another signal or its internal v/o variable wave-shape VCO. The internal VCO has 11 different voltage select-able wave shapes and can be played v/O.
It's also our first digital module, and runs on the Daisy Patch.
Depth: 39 mm
HP: 14
-V mA: 11mA
+V mA: 120 mA
“In the year 2000, I was in college and obsessed with modular synths, but could barely afford to eat. I knew it was possible to build your own synth, but there wasn’t anyone, or anywhere to turn to for advice. In the past decade, much more information has been published online, and in 2013 I started down my path to DIY modular. Even with all of the information online, there still lacked a single, simple, comprehensive guide for those looking to build their own synthesizer. I want AI Synthesis to be that guide. Prior to building my own synth, I was a dreamer, after building my modular, I felt I had awoken. I want to help others do the same.”
Note 1:43 in the video. Patternflow can be used as a controller via OSC.
"Patternflow is an open-source LED synthesizer — a 128×64 HUB75E matrix driven by an ESP32-S3, with four knobs wired straight into the pattern math. Turn a knob, and the pattern bends with your hand.
Everything is open source: STL files, Blender sources, PCB gerbers, and firmware. The full build runs around $100 depending on where you order parts.
— What's in the video —
0:00 This is Patternflow
0:08 How it works
0:26 Build your own (~$100)
1:04 Make patterns in your browser
1:42 OSC — a pocket-size VJ rig
2:03 Why it's open source
Patternflow began with Nam June Paik's Participation TV (1963), the first work where the audience could touch the image. I wanted to go one step further — so I built an instrument where you make the image yourself.
About Daisy
Daisy is an embedded audio platform for creating musical instruments, effects, synthesizers, and other audio projects. Learn more at https://daisy.audio
Credits
Production team: Michael Corell, Andrew Ikenberry, and Takumi Ogata
Presenter: Takumi Ogata
Music: Eugen Schott (bensound)
Stock footage: Pexels
Chapters:
0:00 Intro
0:39 Designing the turntable interface
2:48 Rotary encoders are useful and surprisingly easy to program
4:09 Controlling the pitch of a sample
5:11 Controlling the position of a sample
6:46 Time to build!
8:42 Demo
10:36 Outro"
"Another DIY instrument! This time I used a famous microcontroller: an Arduino Nano (compatible, tbh), a few buttons, and some code to made a really basic (lo-fi) FM drum machine with a built-in sequencer.
Here are some of its features:
• 4 instruments: kick, snare, hi-hat, and tom
• 4 main sound controls: tune, decay, FM amount, and FM ratio
• 4 secondary sound controls: balance, pitch envelope decay, pitch envelope range, and FM feedback
• A full 16-step sequencer with swing and basic parameter locks and on-grid rolls
At the moment, it only has a basic audio output, so I recorded everything into Ableton and added a bit of filtering and some reverb.
These are four beats I made from scratch using only these basic parameters and the internal sequencer.
"Updated version of Divine CMOS. Wonderful module for harmonically rich sounds or use as a complex CV patter and gate generator. Thought the LEDs were superbright purple but turned out to be a mild light blue."
"This module has been thru a few cycles. The original idea for the design is from an article in Electronotes EN#98 by Lester Ludwig, spectacularly titled ‘A Square-wave Frequency-division Sub-octave Cross-product Module, it’s relationship with Lie algebra, and other related processes’ or more simply known as The Cross Product Module.
The frequencies of two VCO signals are separately divided by /2, /4, /8 & /16 ratios. The corresponding divisions are ANDed together and the results, along with all the raw divided frequencies are mixed together in various ways. You end up with a very harmonically thick, animated sound.
I did a full bloat CMOS (Ludwig’s design was TTL) version for a 4U panel back in 2008 or so, but changed the AND gates to XOR gates for a more ring-modulated effect. Then a minimal, slimmed down eurorack version, called Divine CMOS. This just used the XOR’d signal and outputted a signal determined by the pots.
After some requests for an expanded version, I re-visited the design.
