[ $7 Re-build ] DIY eurorack modular synth LFO/VCO with arduino nano & AD9833

My 50th original eurorack modular synth DIY projects.
This is my first DIY LFO/VCO module (terrible workmanship) rebuild.
I have improved the output resistance, V/oct support, etc.
working documents ( schematics )
note.com/solde...
Please support me to continue projects.
In patreon you will find content about my background , technical information and CAD data.
/ hagiwo
I would be happy to receive support from super thanks to continue my development.
Cheap components list ( Japanese )
note.com/solde...
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See Instagram and Twitter for the development status of my next module.
Instagram
/ hagiwo_1
Twitter
/ hagiwo1
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[@justinahrens1868]

Very clever way to correct for the amplitude difference of the square wave versus the sine and triangle waves. I made a sequencer using the AD9833 and ran into this issue - now I need to fix mine! Thanks!

[@-______-______-]

Beautiful looking and sounding. Well done.

[@MiguelRodriguez-ed7yc]

Hello, I really like your work that I follow closely. Please can you tell me what type of switch did you use in this project spst on-off-on or on-on-on? Thank you very much.

[@hughman8597]

As i said so many times before, you are a hero !

[@safetybreakroc]

Hi, I'm working on this build now, and digging into the code a bit to understand it. Can you show how you calculated the variable voctpow in the arduino code? I'm planning on adapting it to hz/volt to work with my ms-20.

[@imnobody303]

Nice rebuild ! I hope to find the time to realize it. Thx !

[@normdurkin6425]

excellent professor thank you..🔥

[@inductor5479]

nice rebuild. Will try that myself

[@buun1456]

[@TheXraften]

Hello! Can i replace the mpc with a CD7074? Will it work the same way? I only have that at the moment. Thank you for the video :)

[@HAGIWO]

I couldn't find the CD7074 IC, but I think it probably can't be replaced.

[@pioter997]

Have question what is SQU-R on schematic? It's on Digital 6 pin and one more next to opamp. Please help me

[@5rockbolt]

join the labels together. Standard method of representing schematics without spaghetti-izing them with criss crossing wires all over the place. There is another label too. Same treatment.

[@drdanoosh]

Serious question, were the potentiometers, knobs, wires, connectors, boards, switches, resistors, etc free? And if so, have I been missing out on a secret stash of free electrical engineering components

[@HAGIWO]

The small parts are bought from aliexpress and are inexpensive. It is in Japanese, but the linked page has a list of commonly used parts. note.com/solder_state/n/n8ef0479418a0

[@DaanKlijn]

Hi Hagiwo great video again! Do you have any other book recommendations besides "arduino for musicians" ?

[@HAGIWO]

I have read several books in the "Make" series. I find them inspirational.

[@nickst2797]

How does the audio signal travel through each module? Is it midi? Is it raw signal? If it is raw, does this mean every module has a adc and a dac stage?

[@jokkemartens8065]

Most of it will be voltages.. Only some chips will be digital. (like this arduino or maybe a midi to CV converter) So there isn't too much conversion going on.

[@nickst2797]

@@jokkemartens8065 Thanks! So its hard to incorporate a commerical keyboard with a DIY modular synth? Since you cant use MIDI.

[@jokkemartens8065]

​@@nickst2797 There are commercial options available. Most use arturia beatstep pro and/or keystep pro. (I use beatstep pro and a regular keystep) (edit: These options output control cv you can plug directly into a modular) There's also a korg sequencer and several other.. Some higher end midi-keyboards also have cv outputs. (I also think native instruments may have some keyboard support and also korg keystage f.e.) Then there's the option of building a midi to cv module, so you can plug a keyboard in that way. With a workaround I think it's also possible to get cv out via your audio interface with ableton. If you have an audio interface that supports it. (I couldn't get it to work easily...) So easiest/cheapest option is an arturia keystep.

[@RC_Cola2020]

Where can you get an Arduino for $2?

[@HAGIWO]

From aliexpress

[@woosix7735]

What do you use for your panels?

[@HAGIWO]

I use PCB. Refer to this video kzbin.info/www/bejne/q6vHZqlvqraiadk

[@woosix7735]

Awesome! That explains why it’s so cheap. I am building a system with 15mm thick aluminum, and it’s a bit more expensive

[@therealpepeu]

Your site needs to be in English! (or Swedish!)

[@HAGIWO]

Automatic translation of Chrome web pages is recommended.