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Thread: New Teensy 4.1 DIY Synthesizer

  1. #176
    geiler typ! sequencer looks great in the video!

  2. #177
    Senior Member Rolfdegen's Avatar
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    Danke. Ich strenge mich an. Thank you. I will give my best

  3. #178
    Senior Member Rolfdegen's Avatar
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    Hi friends..

    We're almost there. My friend Andre now orders the new circuit board and if it works he will order the housing and components for a pilot series.


    For my part, I'm still writing around the operating instructions and programming a few "weird" demo sounds. I'm curious..


  4. #179
    Senior Member Rolfdegen's Avatar
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    Hello there..


    After minor technical difficulties, we are now in the final phase of our development.
    We still had some problems with the FV-1 DSP chip for the effects. But we were able to solve that.
    The procurement of components is still a minor problem. We try it through Chinese distributors.
    The housing construction is ready and will be ordered in the next few weeks. It becomes a transparent one
    and colored housing with support feet (similar to the one in the picture).



    More informatin here: https://www.tubeohm.com/new-developement.html

    I can already reveal a few technical details about the Jeannie ..

    • 8 voices polyphoner DIY Synthesizer
    • ARM Cortex-M7 Prozessor 816MHz mit 1MByte Ram
    • 2 digitale Oszillatoren per voice with PWM controll for Variable Pulse and Variable Triangle Waveform
    • 1 PWM LFO
    • Pitch Envelope für beide Osczillatoren
    • 2 LFOs für Pitch und Filter
    • Osc FX (XOR, XMOD, MOD, AND, OR, FM) with OSC-Mix function
    • 12 Standard Wellenformen (zum Teil bandlimitiert)
    • 500 User Wellenformen
    • Noise Generator (White or Pink)
    • Digitaler 12dB Multimode Filter mit Resonanz und Überblendfunktion (LP/HP/BP)
    • 2 ADSR Envelopes max 12sec für Amplifier und Filter mit positiver und negativer Steuerung
    • Waveshaper mit verschiedenen Kurvenformen
    • Unisono Modes
    • 15 DSP Effekte mit einstellbaren Parametern
    • Farbiges TFT Display mit 128x160 Pixel
    • 16 Step Sequencer
    • SD Karte fürs laden und speichern der Sound Programme max 2048
    • Externer Netzteilanschluss 12 VDC/1A und Netzschalter
      und einiges mehr..



    Sound Demo: https://drive.google.com/file/d/15U35TvE...iew?usp=sharing

    Gruß Rolf

  5. #180
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    816 MHz.. how hot is it, when inside the houseing? Is there a ventilation?

  6. #181
    Senior Member Rolfdegen's Avatar
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    We tested it with a heat sink on the CPU. The temperatures in the case are below 60 degrees.

  7. #182
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    In summer, too? (well, a real summer, not this summer here in Germany) Teensy reboots or switches off if the die temperature is too high (but you can set the "panic" temp higher)
    A very very nice project.

  8. #183
    Senior Member Rolfdegen's Avatar
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    I test the temperatures. At 74 degrees the CPU does a reset.

  9. #184
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    The die temperature is about 90°C, then.

  10. #185
    Senior Member Rolfdegen's Avatar
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  11. #186
    Senior Member Rolfdegen's Avatar
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    Do the same again on Youtube if it doesn't work on Soundcoud. Everyone has.
    In the future I will only upload the sound to Youtube. I am not aware of any other free,
    unlimited and free platform for music.



    https://youtu.be/UMu46sERF3A

    Regards from West germany

  12. #187
    Senior Member Rolfdegen's Avatar
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    Hello dear Synthians


    The new Jeannie Panel Board has arrived from China. Andre has now soldering the board and
    tested. It all works wonderfully. The DIY manual is also almost ready. Now that's all that's missing
    Housing and then we're done.





    Greetings Rolf
    Last edited by Rolfdegen; 09-12-2021 at 06:14 PM.

  13. #188
    Member DIYLAB's Avatar
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    Hi Rolf,

    i have no idea about synthesizers, but your GUI is beautiful, i appreciate every pixel ;o)

    Best
    Bruno

  14. #189
    Senior Member Rolfdegen's Avatar
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    Thank you. :Ö

  15. #190
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    Hello Rolf,

    in #187 you show a picture which says FXDSP Phaser.

    In Green it says DEEPTH, should this not be DEPTH

    Regards, Otto

  16. #191
    Senior Member Rolfdegen's Avatar
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    Thanks for your tip. Of course you are right. It has to be called depth

  17. #192
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    happy to help.

    Regards, Otto

  18. #193
    Senior Member Rolfdegen's Avatar
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    The backside from Jeannie with the assembled boards.



    Now the case is made and then we're done. The assembly instructions can be downloaded from tubeohm.com. Sales will start soon.

    https://www.tubeohm.com/

    New Sound Demo: https://youtu.be/MubIuBQYDOw

  19. #194
    Senior Member Rolfdegen's Avatar
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    The case is now ordered. I'm curious..


  20. #195
    Senior Member Rolfdegen's Avatar
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    I changed the filter page a bit. Instead of "AMT" I have "ENV" as
    Parameter designation selected. The red marker for CUT is now also available.


    FilterMix LP / HP (LP red / HP yellow)


    A filter submenu can be reached using the Shift key. Then you can
    Set the filter velocity, key tracking and LFO modulation strength.




    Software changes in the sequencer
    The sequencer record function now records velocity values when playing the notes on the keyboard.
    The volume of the notes corresponds to a color. The lighter the color, the louder the note.



    A poly-mode sequencer is also planned. After all, we have an 8-voice synthesizer.
    A maximum of 4 notes are saved in one step at the same time.


    Greetings Rolf

  21. #196
    Senior Member Rolfdegen's Avatar
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    Hello Paul

    I have a problems with the releaseNoteOn function (5ms) in my polyphonic DIY Synth.
    If the releaseNoteOn phase were the new note will be played (see picture).
    I'm using Teensy 4.1 and the latest Audio Lib. Release Phase is 4.4sec long.
    Play 8 voices is good and Click the 9th note and the following

    Envelope curve



    1. Voices block


    Thanks for help

  22. #197
    Senior Member Rolfdegen's Avatar
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    Hallo everybody

    The new colored cases have arrived. We have three colors: black, blue and yellow.






  23. #198
    Senior Member Rolfdegen's Avatar
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    Small video about the polyphonic sequencer ..


    The sequencer now has a mode function.
    In mode: REC, notes are received from a connected midi keyboard.
    The pitch of the notes can then be edited with pitch or muted with mute.
    In mode: TRP, the sequencer notes can be transposed using a midi keyboard.
    In mode: KEY you can play additional notes via a midi keyboard.



    Youtube: https://youtu.be/-MgLeGGeYow

  24. #199
    Senior Member Rolfdegen's Avatar
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    Hello there..


    My Jeannie has finally found a nice home



    Kits, components and assembly instructions are now available at tubeohm.com.

    Greetings Rolf

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