[ $35 ] DIY eurorack modular synth YAMAHA FM VCO with arduino and YMF825 / DX7 type for ambient

My second arduino projects.
Diy eurorack modular synthesizer FM VCO module with arduino and YMF825.
YMF825 is DX7 type 4 OP FM sound source IC.
The sounds are usefull for ambient PAD and bell.
Get YMF825board from
www.switch-sci...
or
akizukidenshi....
(Probably limited to Japan)
Please support me to continue projects.
/ hagiwo
My other DIY modular synth movie.
$20 DSP effect module:
• DIY modular synth / $2...
$10 EQ module.
• DIY modular synth / $1...
$7 LFO&VCO module
• [ $7 ] DIY eurorack mo...

[@jimmy_jamesjams_a_lot4171]

The chords sound wonderful, especially the minor chords. That at least you did really well. I think you’ve done splendidly all around, and you are a REALLY GREAT planner of extremely affordable diy modules from available boards out there! AWESOME job of making these things, and very affordable! Thanks for sharing!

[@asciisynth]

This is really great! I love the simplicity and low parts count of your modules too, that is always a plus for DIY builds. I see you said in another comment that you don't want to release the code because of bugs - but, I'd be really grateful to see your code! I have built an Arduino VCO myself which works well (I can share my code with you if you want), but it's always interesting to see how different people have solved the issue with analogue input noise, and how to get good V/Oct resolution with only 10 bits. I solved those issues fairly well, but there are probably other approaches that I haven't thought of.

[@HAGIWO]

Thank you. I also had a hard time with the V / oct problem with the 10bit DAC. The memory effect of the multiplexer had a negative effect on the pitch. The countermeasure is a large capacitor. Also, since the YMF825 operates in 12 scales, the noise effect can be reduced by quantizing. In fact, the reason why you can't open the source code is not only a bug but also a copyright issue. This is because the 30-bit sound data is based on Yamaha's work.

[@chrisspatschek8986]

Hey, I'm building a diy modular synth right now - I would love to see the code from your VCO and your build. Is there anything online or can you send me sth.? I m at the very beginning with my project so have no builds to trade so far but would shurely do as soon as I m into it (and its running without glitches) =)

[@asciisynth]

@@chrisspatschek8986 I've uploaded one of my designs to Github: github.com/Blinken-Lights/synth-modules/tree/master/8-Bit-Waves - it's not perfect and I would do things a bit differently if I built it again. But you can see the analogue input circuitry and the lookup table used to turn 1V/Oct into frequency. It is able to track with analogue oscillators pretty well over a few octaves.

[@chrisspatschek8986]

@@asciisynth thx for your reply! I ll have a look into it! Cheers

[@thnknde]

I will be making everything here, this channel is amazing!

[@lorenmax9460]

super dope--well done!

[@ChiefThomson]

that most certainly looks like a fun project to build and appears to produce quite cool sounds. nice one

[@えどもんど江戸者奴]

こんなモジュールからFM音源の音が出て来るなんて驚き踊ろ喜です。

[@turbochargedfilms]

Beautiful sounds ❤️❤️

[@soejrd24978]

Beautiful stuff! Hope you'll share the "in the works" files

[@arcticserpent]

As of March 2021, I have not been able to find these anywhere. Does anyone have a link that'll work with US?

[@seantyasmusic]

Ha! One year ago arduino was 1 cent? Its 9 dollars now on that same product page ha!

[@HAGIWO]

Until a year and a half ago, the arduino nano was $ 1.8. I pray that the terrible shortage of semiconductors will be resolved soon.

[@scottarmstrong8585]

splendid.

[@mammouthboutique1308]

Great job, I'm really interested with CV input/chords part. Is it's possible to have this part of the code? Thanks

[@BanjoMasterPete]

This is super cool, any chance of adding some cv functions other than pitch/gate?

[@jimmy_jamesjams_a_lot4171]

If you’re looking for soMething more comprehensive with the cvs and all, I am currently building a YM3812 based module that is a four operator FM module. The PCB uses surface mounts, and involves a LOT of panel wiring for lack of panel PCB, however with this you get added freedom with component form factors, or you could use your preference. It’s by Reckless Experimentation Audio, and I believe he is out of Florida. My experiences would lead me to believe that with this module there should be some room for firmware modifications, if not completely custom rewritten firmware altogether. So if you could manage another cv input for FM modulation, you could easily daisy chain these modules. IF I am wrong, it doesn’t mean that I am lying (just means that I believed what I said when I said it, ignorant as I may be)! So grab your data sheets, DL the developer’s environment, and poke around with it! I’ll bet you could pull something off that’s at least innovative albeit piggybacked from off this module. If you’re not very savvy with the coding stuff, you’ve got to start somewhere and I’d bet this module is a perfect candidate for innovations as you’re suggesting! Good luck!

[@HAGIWO]

You can also control FM parameters. However, Yamaha's FM parameters are complicated and it is difficult to find a sweet spot. That's why I implemented the preset selection feature.

[@martingerken7094]

Any European source for this module?

[@willemdaffo]

Good job, this is great. Any chance of selling a kit or module?

[@phonopollution]

This is fantastic, any chance to get the code and circuit?

[@HAGIWO]

The circuit is introduced in the video, but the code has many bugs, so I have not uploaded it. This is my second arduino project and my code is immature.

[@thenetware1]

Olá meu caro amigo, tudo bem? Gostei muito dos seus projetos, estou acompanhando todos os vídeos.... Pena que no Brasil é muito difícil encontrar os componentes para as montagens. Saudações do Brasil

[@HAGIWO]

YMF825 is difficult to find in countries other than Japan.

[@hostnik777]

Do you know of any 6op FM engines for Arduino? I want to make something like the Volca FM but with a sample engine and so it’s almost like a TG33.

[@HAGIWO]

I don't know 6op ic. The relatively new FM sound source IC can be modulated with waveforms other than sine waves, so I think that 4op is sufficient. As with REFACE DX.

[@sehrgut42]

I'd love to do something like this myself, but I'm running up against a brick wall trying to find the programming manual for the YMF825. Where did you find the information necessary to patch it?

[@HAGIWO]

plz refer to github. github.com/hasebems/YMF825_sample

[@sehrgut42]

@@HAGIWO Thank you!

[@jimmy_jamesjams_a_lot4171]

Wait wait wait wait wait my brother wait!! Those chords in the background playing. Were those a separate module or is it a poly- or paraphonic mode or maybe you used two of the same module there? It sounded really cool with the background chords and then you were playing on your key step when caption said prototyping at about three minutes 50 seconds or so. Also I applaud the perf board build, and just how low the parts count on the BOM!! AWESOME WORK!! I’m gonna keep an eye out for your work!!

[@HAGIWO]

Thank you!! The PAD of the latter half of the performance is single mode. It sounds like a chord because it has a deep reverb. The YMF825 has a maximum of 16 polyphonics, so its potential is great. However, controlling 16 polyphonics with a modular synth is just too difficult.

[@normdurkin6425]

..is it possible to get the source code information in English..?

[@MrGuillermofrancisco]

hello, beautiful module !! anyone know where i can buy the YMF825? Thanks a lot

[@HAGIWO]

Thank you ! It may be difficult to buy outside of Japan. Since it is a commercial IC, the sales channels for individuals to obtain it are limited.

[@doomsday.tomato]

They don't stock these chips anymore :(

[@diamant3njoe]

1:17 play him off, keyboard cat

[@restingglitchface4121]

Any chance on getting the code yet?

[@HAGIWO]

Since the tone data is copyrighted by Yamaha, we do not publish the code.

[@noahtotten]

@@HAGIWO Is there somewhere I can get the code from you privately? I don't mind starting from scratch if necessary but it would certainly save a lot of time! Thank you!

[@mattportnoyTLV]

Isao Tomita.