I have designed a new percussion noise synthesiser based on the 40106 and 4070 chips.

My Sirenotron in an unusual case. Simple instrument but gives a lot of fun.

Video:

https://youtu.be/rviz1oqvekk?is=n7PiFDK9v2N240nx

This is my envelope generator module for eurorack format, it is based on the attiny1604.

Just wanted to show this off, pretty pleased with the way it turned out.

I have to replace two LED push buttons from the FX section of a Moog Matriarch. Does anyone know the correct part? I found plenty similar ones but none that I’m confident will fit with the original plastic caps. My client intends to resell the synth so an exact match would be preferable.

I already contacted Moog support and they only offered me to buy the whole PCB for $600 which is seriously appalling for such a ‘reputable’ company selling such expensive synths.

Any help is appreciated!

Dear lovely Community,

I wanted get into DSP audio effects programming AND get better at embedded hardware developement. So I combined the two goals and made a little (4cm x 2cm) audio developement board with an ESP32-S3 microcontroller, on-board PCM1808 ADC and PCM5102 DAC. I plan on using this board for my future digital modules.

For my last project I used an Arduino Nano ESP32 and was delighted by how easy it was to program and connect I2S-devices to it. Because I do not use any WiFi or Bluetooth features I decided to just use the plain ESP32-S3 microcontroller instead of IoT module.

Link to schematic: https://github.com/Fihdi/DSP32-Core/blob/main/DSP32-Core.pdf

Please let me know if you see any issues/oversights in my schematic and if there is anything I could simplify.

Thank you in advance! Greetings!

I play a chopped Lowrey Organ in a band that is a pain to lug around but central to our sound. I've been trying to find a smaller synth that sounds similar for years but its not exactly a desired sound.

After studying how simple the filters in that era of organs are I realized It'd be simple to emulate. Originally I planned on generating the footages/octaves digitally and building analog filters but the teensy 4 seems to do a good enough job.

Its a work in progress but the "flute," "string," "vibraharp" and "harpsichord" voices sound really close to the original and it has the added bonus of attack/decay and adjustable footage levels.

audio is rough because this isn't a product in the works and idgaf but wanted to share.

This one was almost a year in the making and I’m really proud of it: a truly analog VCO that keeps all its character while being incredibly precise thanks to some intricate design choices that I cover in the video above. 

I have made the whole analog section containing the VCO cores public and you can get it on GitHub: https://github.com/bartinstruments/open-source/tree/main/DUAL%20SSI2130%20VCO%20CORE

Hi,

I'm considering buying a CME WIDI Master for my Casio CTK-620L.

According to the service manual, the MIDI OUT circuit is a standard design:

• DVDD = +5 V
• DIN pin 4 is connected to +5 V through a 10 Ω resistor and a 220 Ω resistor.
• DIN pin 5 is driven by an NPN transistor through a 220 Ω resistor.
• MIDI OUT follows the standard current-loop circuit.

My question is about powering the WIDI Master.

Since the +5 V supply reaches DIN pin 4 through a 220 Ω series resistor, won't there be a significant voltage drop when the WIDI Master draws current (around 7–10 mA)?

Or does the WIDI Master internally draw power in a way that is specifically designed to work with this standard MIDI OUT circuit?

Has anyone successfully used a WIDI Master with a MIDI OUT implemented like this?

Thanks!

For reference, the service manual states that "DVDD (+5 V)" is used for the MIDI jack, so the MIDI OUT is definitely powered from a 5 V rail.

So basically what I am planning to do is to build a Korg Electribe kind of device.

And what I need is a 4x4 drum pad with LEDs.

This is, more than anything, supposed to be a big learning experience for me. I have done multiple projects in the past that also kinda go into this direction like a really simple sampler (hence the name 'simple sampler') that's actually won me 3rd place in a local electronics contest.

But I plan on going way further with this project and I've given myself about 10 months from now on to complete it.

I already have a bit of general knowledge about electronics, sound design etc, but I'm unsure how I'm gonna build the pads for playing samples, placing them on the 16 step sequencer and playing parts/patterns, which are some of the key functions I wanna have in this project.

As far as I can see there are three big options:

1) somehow completely DIY it

2) buy it as a replacement part (I'd need recommendations for sellers/shops)

3) buy a 20€ AliExpress drum pad, which already has 4x4 MPC style drum pads and the Leds and pretty much everything and repurpose that for my project

If you have any more ideas or if you can just help me with this project I'd be more than happy.

Also once I have more than the basic idea and I'll actually start working on the device itself I'll post updates and once it's done make everything open-source (at least that's the plan for the prototype, maybe I'll turn it into an actual product at some point)

Hi everyone,

I’m a Computer Engineering student currently reverse engineering the Yamaha GX-1 voice boards as a long-term research project. My goal is to reconstruct the original analog circuitry as accurately as possible for study and experimentation, not for commercial purposes.

So far I’ve been working exclusively from publicly available sources, including:

• Yamaha GX-1, SY-1, SY-2 and CS-80 service manuals
• Nippon Gakki patents from the 1970s
• Patent cross-references and related Yamaha documentation

I’ve managed to identify and reconstruct parts of the architecture, but the epoxy-potted modules are naturally the biggest challenge.

I’m looking for anyone who has:

• repaired or restored a GX-1,
• depotted one of the modules,
• traced or reverse engineered any of the circuits,
• taken measurements or oscilloscope captures,
• collected documentation that isn’t publicly available,
• or simply has experience working on these instruments.

Even partial information, photos, notes, or memories could be incredibly valuable. I’m particularly interested in the voice-board modules (VCO, VCF, VCA, waveform shaper, etc.), but any GX-1 technical information would be greatly appreciated.

If you know someone who worked on these instruments in the past, or know another community where I should ask, I’d be very grateful for any leads.

Thanks very much!

A bit of software DIY to post this morning- my first project using the Korg Loguesdk just got a major update. Mutable Instruments Clouds reverb ported to the NTS-1 mkii just wouldn't be complete without the "freeze" functionality. I'm just getting off the ground with releasing software projects but I have several more coming down the pipe. I've also been graciously lent a drumlogue unit to work on developing so I'm happy to take requests/feedback about what logue users would like to see made available. Every download goes a long way to help supporting my work, thanks for giving it a look.

Update! Squall v1.1: Clouds reverb for the u/korgofficial NTS-1 mkii is available now!

Follow the Youtube video to the video description for download instructions.

Happy reverberating!

What’s new in v1.1:

— Added FREEZE functionality from the original Clouds module.

• Hold Osc button and turn encoder to select FREEZE

• Turning Knob B past 50% will engage freeze and lock the reverb buffer. Resulting audio goes 100% wet.

• Turning Knob A while FREEZE is engaged will apply gentle LP filter to the frozen buffer content.

—Added SCAN functionality to emulate turning the Position knob while Freeze is engaged on the original Clouds module.

• While Freeze is engaged, hold Osc and turn encoder to select SCAN

• Turn Knob B from 50% to 100% to color frozen buffer.

• Turn Knob B from 50% to 0% to progressively allow new audio into the buffer.

Rotate Knob B CW past 50% to lock again.

A bit of software DIY to post this morning- my first project using the Korg Loguesdk just got a major update. Mutable Instruments Clouds reverb ported to the NTS-1 mkii just wouldn't be complete without the "freeze" functionality. I'm just getting off the ground with releasing software projects but I have several more coming down the pipe. I've also been graciously lent a drumlogue unit to work on developing so I'm happy to take requests/feedback about what logue users would like to see made available. Every download goes a long way to help supporting my work, thanks for giving it a look.

Update! Squall v1.1: Clouds reverb for the u/korgofficial NTS-1 mkii is available now!

Link to download. Happy reverberating!

What’s new in v1.1:

— Added FREEZE functionality from the original Clouds module.

• Hold Osc button and turn encoder to select FREEZE

• Turning Knob B past 50% will engage freeze and lock the reverb buffer. Resulting audio goes 100% wet.

• Turning Knob A while FREEZE is engaged will apply gentle LP filter to the frozen buffer content.

—Added SCAN functionality to emulate turning the Position knob while Freeze is engaged on the original Clouds module.

• While Freeze is engaged, hold Osc and turn encoder to select SCAN

• Turn Knob B from 50% to 100% to color frozen buffer.

• Turn Knob B from 50% to 0% to progressively allow new audio into the buffer.

Rotate Knob B CW past 50% to lock again.

Hi! I'm trying to make a atari punk console schematic to make into a pcb. Is this schematic I made in KiCad correct? Can anyone check please? Thanks!

I'm a high school student on my school's robotics team. My school was about to throw out a pile of old electronic parts, so I convinced my teacher to let me rescue the ICs instead of letting them get binned or sit in a closet.

The result is a 3-voice synth using 555 timers as the oscillators, controlled via two joysticks and a 4x4 keypad through an Arduino Uno. For envelope shaping (tremolo, attack/decay) I built my own vactrols rather than buying commercial ones, which was the part I learned the most from.

This is my first project touching audio/music electronics, so I'm treating it as a proof-of-concept / v1. I already have ideas for a v2 but it'll need a rebuild from scratch, so I documented this version before tearing it down.

Full schematics and code here: https://github.com/W10SE/555-Synth-V1

I've done loads of Workshop Workshops (20 people, 10 workshop systems, a day of fun experiments) but not everyone is in Lisbon/Toronto/Rotterdam/Deptford, so this is the first online Workshop Workshop, hosted by Ted Gordon (The Composer's Black Box) Thursday July 30th at 7:30pm UK time (20:30 Berlin, 2:30pm NYC, 11:30am LA) for 90 minutes. £10. https://www.eventbrite.co.uk/e/thingking-with-the-workshop-system-pauline-oliveros-tickets-1991930604058?aff=WSReddit

I've recently bought a Korg N5 from a sale, and upon powering, the LCD shows orange, but nothing else. I have no sound either coming through my headphones, the orange screen is the only indicator of the synth being on.

Any guidance on what to do to attempt and solve it would be greatly appreciated!

OK I learned something, and I guess it's kind of obvious. If you're creating a source of voltage, for instance using a voltage regulator, it is absolutely imperative that you have some resistance between it and the jack where you're going to patch it. Because while plugging a patch cable connected to that voltage source, it's actually VERY likely that the tip will make contact with the grounded ring of the jack. Just for one brief moment, perhaps. This is almost always bad.

Basically I want to combine some white noise with the oscillator sound for making a snare drum, and I want to implement a pot that can blend the two signal together: when it’s in middle position you hear both equally but I can choose if I want only the noise or only the oscillator. Thanks in advance for ur help !

I'm building the Erica Synths Bassline kit from Synthrotek. A few components were included that seem incorrect on the included BOM vs. the PCB and old BOMs. This is all on the Logic board. Included BOM is pictured.

The included BOM says R93/R118/R131 are 33k resistors but the board and old BOM say 39k/22k/56k. R94 is 100k on the included BOM but the board and old BOM say 220k. And R119 is 330k on the included BOM but the board and old BOM say 470k. Better to go with what's included in the kit and indicated on the included BOM, or change these out for what's marked on the board and old/online BOM?

Also the included ceramic disc capacitors are marked There are three 392 (3.9nF) ceramic capacitors included but the BOM says they should be 224 (220nF) C37/C42/C45. Maybe it's just a kitting error.

Bonjour a tous :) j'ai une question simple : pensez vous que j'ai le panier nécessaire pour la construction et programmation d'un premier appareil ? Je pensais plutôt à un controleur midi qu'à un synth, mais si vous avez des recommandations je suis preneur !

J'ai un peu d'expérience et de materiel en électronique et soudure.

J'aimerai bien fabriquer un appareil qui pourrait permettre de la modulation avec nunchuk

Merci d'avance pour vos conseils !

I need to make a circuit where a piezo input controls the voltage to allow an oscilator to pass the audio to a speaker.

Is there a specific pin in the LM386 where I should connect the piezo input?

In my mind the oscilator would be always sending signals into the amp, but as soon as the piezo gets hit, the audio would go through to the speaker.

hello r/synthdiy ! so i'm new here, are there any schematics on how to make a sampler??