Jeannie Polyphonic DIY Synthesizer

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rolfdegen
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Jeannie Polyphonic DIY Synthesizer

Post by rolfdegen »

Hello DIY friends
I would like to introduce you to Jeannie

Jeannie is an 8-voice polyphonic open source synthesizer with 24dB Ladder Filter and 12dB State Variable Multimode Filter

Jeannie is an 8-voice polyphonic open source synthesizer kit with digital sound synthesis and digital filters based on a fast ARM Cortex-M7 processor with 1MByte Ram. For sound generation, the user has a variety of classic and band-limited waveforms at his disposal. A pool of 15 waveform banks with 63 different waveforms each offer plenty of space for sound experiments. A waveshaper with different characteristics provides for gentle to vicious sounding distortions. To tame the waveforms, there is a digital 12dB multimode filter with fade function from low-pass to highpass and a band-pass function. In addition, there is a 24dB LP ladder filter. A 24Bit DSP effect module with adjustable parameters rounds off the sound synthesis. An integrated polyphonic 16-step sequencer provides for the playfulness of the small synthesizer. A total of 2048 sound patchesfrom 15 banks can be loaded and stored via an integrated SD card. A color 1.8 inch TFT display allows a clear menu structure and easy operation of the synthesizer. The parameters are entered via four rotary knobs below the display and an encoder for selecting the sound programmes and switching to the menu functions. In addition, there are six buttons for operating special synthesizer functions.

https://www.tubeohm.com/

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Features
• DIY 8-voice polyphonic synthesizer
• ARM Cortex-M7 processor 720MHz with 1MByte Ram
• two digital oscillators per voice
• 15 waveform banks with a total of 945 waveforms
• 12 standard waveforms, some of which are band-limited
• Noise generator (white and pink noise)
• Oscillator Modulation (XOR, XMOD, MOD, AND, PHA, FM)
• Waveshaper with different curve shapes
• 2 LFOs with 6 different waveforms and fade in / fade out function
• 2 ADSR generators 0.3ms – 12s with positive and negative control
• 1 PWM LFO from 0.04Hz - 25Hz
• Digital 12dB multimode filter with resonance and fade function (LP/HP/BP)
• Digital 24dB low pass ladder filter with resonance
• 24Bit DSP effect module with 15 effects and adjustable parameters
• Polyphonic 16 step sequencer
• SD cards for loading and saving the sound programs max. 2048
• Colored 1.8 inch display with a resolution of 160x128 pixels
• Volume control
• Boost function for improved bass reproduction
• Stereo audio output jack 6.3mm
• 4 potentiometers for parameter input
• Encoder for menu control and sound selection
• 6 function keys
• Midi In and Midi Out / Midi True
• USB 2.0 midi interface
• Simple firmware update via USB
• External power pack 12V DC / 1000mA
• and power switch

Sounds on soundcloud..






Videos on youtube..







Hardware

Panel Board
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Back
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Teensy 4.1 MCU Board with 720MHz
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32bit DAC Board PCM5102A
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SPN1001-FV1 Effect Board
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Schematics
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Greetings from germany. Rolf
steviet
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Re: Jeannie Polyphonic DIY Synthesizer

Post by steviet »

Very cool!! :sb:
Website - DIY/Euro/Gear Blog updated every Sunday
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guest
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Re: Jeannie Polyphonic DIY Synthesizer

Post by guest »

nice work!
openmusiclabs.com
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devinw1
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Re: Jeannie Polyphonic DIY Synthesizer

Post by devinw1 »

That's pretty badass. Nice work!

I will say I don't love the plexiglass case, but other than that it's awesome!
djs
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Re: Jeannie Polyphonic DIY Synthesizer

Post by djs »

This thing is way cool, and I hope to get one once I finish some stuff in my backlog (along with the de generator, if it's still around).

Question though- do you see any issues with the current chip shortage and the stuff needed for this?
"Noise is what the Earth is made of" - David Bowie
@neutronstar604
tubeohm
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Re: Jeannie Polyphonic DIY Synthesizer

Post by tubeohm »

****Question though- do you see any issues with the current chip shortage and the stuff needed for this?
Actual i got all parts i need , but the parts will be more expensive from week to week .
The only special IC is the MCP3208 , costs at first 2,80 and now 4,60......
G
Andre'
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brawnywynn
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Re: Jeannie Polyphonic DIY Synthesizer

Post by brawnywynn »

Love it! Congrats! Looking forward to playing this.
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rolfdegen
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Re: Jeannie Polyphonic DIY Synthesizer

Post by rolfdegen »

Klang Impressionen Jeannie and DeepMind 6



I personally like the sequence from 16:00 very much. All played live and randomly with the ARP in DeepMind 6.
The high chirp tones are played by the DeepMind 6 and the others come from the Jeannie.
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rolfdegen
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Re: Jeannie Polyphonic DIY Synthesizer

Post by rolfdegen »

SysEx Dump works now. See short video.

It was a bit more complicated than I thought. First, conversion routines had to be developed for all 212 parameter values in the Jeannie, which convert 8/16-bit integer values and 32-bit floating-point values into a 7-bit format for the SysEx dump. The same had to be converted back again.
This was followed by functions for the transmission and reception of SysEx data. Last but not least, a simple menu for operation had to be developed.
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The transmission path is selected with Destination (Midi or USB)
DUMP type is either a patch or a bank.
DUMP-Bank sets the bank (A-P) for transmission or reception.
Source is either the patch no. or when receiving the space in the selected patch bank.
SYSEX-DUMP is set to send or receive SysEX data.
The "Load/Save" button starts transmission or reception.
A progress bar shows the progress of the transfer.



Greetings from germany. Rolf
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KSS
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Re: Jeannie Polyphonic DIY Synthesizer

Post by KSS »

:tu:
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flagada
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Re: Jeannie Polyphonic DIY Synthesizer

Post by flagada »

Thanks for sharing!
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