[ $6 ] DIY modular synth FM VCO with arduino mozzi library | 2 operational FM synthesizer

[@ronsone8373]

Omg pair that with that cv seq and you have instant techno

[@maciejadamczak7231]

Beautiful! Love it

[@asciisynth]

Brilliant module as ever! I've been wondering if an STM32 Blue Pill would make a good 1V/Oct VCO running Mozzi. The only problem with those is that the analog reference voltage is tied internally to the microcontroller power, so even though it has 12 bits of analog accuracy, the measurement can be really noisy. I just ordered an ADS1118 SPI 16 bit ADC which could add a good analog sample rate and accuracy for a 1V/Oct input. Which might work well with Arduino Nano too! Anyway the sounds you've got are great and don't need any improvement, it's just amazing what you've done with an Arduino Nano.

[@HAGIWO]

You're right. I was also skeptical about the accuracy of V / oct, but when I actually played the sound, I felt that it was not enough to bother me. Thank you!

[@demondays3396]

An Etsy seller is marketing this as a "VOICE SYNTH" and yet, using THIS video as their example of the 2OP FM. Kinda weird to advertise it that way when there's no voice track being ran through it.

[@TobaTobias]

Great work HAGIWO! Question for you, could I use a TL072 op amp instead of your NJM2732 op amp? I think those are just from Japan :)

[@HAGIWO]

TL072 cannot be used because it is a split power supply. A single power supply operational amplifier can be used as a substitute.

[@benjiaomodular]

Thanks! I was wondering the same thing. I'll try it out with an LM358 soon.

[@TobaTobias]

@@benjiaomodular Let me know how that goes, I tried the LM741 and it’s a little noisy...

[@sergioska]

I'm trying TL072 and it works fine

[@freduti]

@@sergioska I'm thinking to use TL072 too, did you use it with +5V/0V?

[@freduti]

I really love your desings! You're are an inspiration to me. I have one question, how do you "see" that waveforms in oscilloscope? I understand it's PWM, not real signals, right?

[@HAGIWO]

The pin out on the Arduino is PWM, but when it passes through the CR low-pass filter, it becomes an audio waveform.

[@RetroPlus]

Sounds so good, and so cheap

[@benjiaomodular]

This is awesome! And thank you for sharing your code and schematics. I'll definitely try to build one for my own all-DIY setup.

[@jean-philippefalcon3238]

Man, you’re a Rockstar ! You’re modules are truly breathtaking. Can’t be more grateful for all the great stuffs you’re sharing with us.

[@Ferrichrome]

Wow... That's awesome. You should sell these, as I have neither the technical prowess nor the patience to build one myself. But I'd love to make music on something like this.

[@HAGIWO]

Since FM synthesis is installed in the mutable inst plaits, it can be used as a substitute. thank you!

[@danielmendes5682]

so amazing that an arduino nano can do such sounds

[@lodwar]

Hero! i want to rebuild some of your ideas. Guess i will support you...

[@eduponte1857]

Awesome. Really glad for those project. The Mozzi fm it’s a good deal to make percussion sounds with this metallic noise. Could be possible integrate the AR envelope together?

[@HAGIWO]

Thank you! You can add AR by changing the program. In my project, I removed the built-in AR feature due to the size limit of 6HP.

[@eduponte1857]

@@HAGIWO awesome Like a percussion made interesting as hell. Thanks for the tip

[@AdrianMagni]

Here today, gone tomorrow, that's me. Hahahaha!

[@monzonoiselab5695]

Man i love Your work you’re really talented and inspiring, i just put together the 2 oscillator module and I’m going to try this one next, but I wanted to ask, do you use 100 or 10k pot? Is the only thing I didn’t understood! But your work is amazing dude, i wish i had half of your talent

[@HAGIWO]

Thank you! It doesn't matter which one you use for the resistance value of the pot.

[@monzonoiselab5695]

@@HAGIWO thanks a lot!

[@romanopekushin3099]

Handsomely! And it's very easy to repeat. Your work is simple at first glance, but inherently very technologically advanced. You are a talent! The right direction in life.

[@expensivenotes]

Cool Sounds. Great work!

[@MrGuillermofrancisco]

Thanks my Hero genius!!

[@normdurkin6425]

..definitely need this one.. thanks professor 😁👍

[@carlosmanssurbaus1267]

Amazing. Do you sell this modules?

[@HAGIWO]

Let's DIY!!! thx!

[@imnobody303]

For my purpose I've upgraded your module with two additionals potentiometers to select carrier wave and modulator wave. It is very interesting.

[@barrierloss]

wanna share them upgrades?

[@weirdofromouterspace3515]

I just started building the 2OP FM and Additive VCOs on the weekened. I have just one question though: I suppose using linear pots (B100k) is suitable for most purposes, but what about the basic tune pots (carrier frequency in the FM VCA; fundamental frequency in the Additive VCA). Also Linear (B100k), or rather logarithmic/audio (A100k)? Thanks for all your great work, this is truly amazing and inspiring!

[@HAGIWO]

Since the resolution of Arduino's AD converter is not good, it may not be possible to make detailed settings with A curve or C curve. Thank you.

[@weirdofromouterspace3515]

@@HAGIWO Thank you so much, that was really helpful! I'll then use linear/B pots throughout. I'm rather familiar with analog synth DIY and have built quite a few including a TTSH and a MFOS SoundLab Ultimate, but I'm not that experienced concerning Arduino stuff :).

[@DaanKlijn]

Hi HAGIWO, thanks for another great module! I have one question: What is the purpose of the 100K resistor and 68nF capacitor next to the schottky diodes? Are they also needed for reverse voltage protection?

[@HAGIWO]

The 100k resistor is there to stabilize the read voltage when there is no external voltage input. The capacitor is there to stabilize the voltage when reading the external input voltage.