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Thread: New Teensy 4.1 DIY Synthesizer

  1. #126
    Senior Member Rolfdegen's Avatar
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    The 1st draft in 3D


  2. #127
    Senior Member Rolfdegen's Avatar
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    It is progressing ..


    The 3D model of the motherboard. The board is roughly the size of a laboratory card in euro format (160 x 100).


    The Fx module is simply plugged onto the back.







    The current prototype



    Greetings Rolf

  3. #128
    Senior Member Rolfdegen's Avatar
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    Hallo friends


    The board is now ready. We thought about integrating an expansion connection (K4, K8 ) in the synthesizer for the electronics hobbyist).


    It consists of 3 analog inputs (0-3.3V), as well as data lines and power supply for controlling a second 74HC595.


    This means that potentiometers, switches and control voltages can be queried via two 16-channel analog multiplexers (74HC4067), for example.


    Frontside


    Backside


    Control Circuit with expansion connect ( K4, K8 )


    Greetings. Rolf

  4. #129
    Senior Member Rolfdegen's Avatar
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    Hallo friends..

    Now we are done and we start producing circuit boards in China







    Gruß Rolf

  5. #130
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    Hi,
    Looking very good!
    What will be your business model for this? Can I start ordering a a teensy 4.1 and audio board?
    Thank you
    Daniel

  6. #131
    Senior Member Rolfdegen's Avatar
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    Hi Daniel

    The PCB boards or DIY kit with case can be ordered in future from Tubeohm.com.

    You don't need an audio card. An 16Bit audio converter (PT8211) is fitted on the board.

    Greetings Rolf

  7. #132
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    Hi Rolf, can you tell me when the board will be available?

  8. #133
    Hello rolf! How much $ and how long until a Jeannie is in my hands here in California? I don't see them on tubeohm yet. Also, the presets seem identical to my Tsynth...how did that happen? Are they a set of known synth presets used by a bunch of synth designers?

  9. #134
    Senior Member Rolfdegen's Avatar
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    @alfrede
    We are waiting for the first boards. It will take a while before circuit boards or kits can be ordered.

    @trevorbryden
    The Jeannie Synth-core is a little different from TSynth. It's smaller and has 8 voices, 8 banks with 64 different waveforms, Sequencer, 24-bit Fx chip for reverb, delay, corus and more. LowPass filter at the output to reduce high frequencies. Boost switch for more depth. It will be a transparent yello plexiglass case.

    The price has not yet been determined. We are still negotiating with dealers in different countries.

    Greetings from germany. Rolf

  10. #135
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    I'll be watching this space.

  11. #136
    Senior Member Rolfdegen's Avatar
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    Hello..


    It won't be long before we can hold the circuit boards in our hands and then test them.


    My friend Andre has already published the "Jeannie" project on his homepage tubeohm.com.


    Link: https://www.tubeohm.com/new-developement.html


    Greetings Rolf

  12. #137
    Senior Member Rolfdegen's Avatar
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    My friend Andre is busy soldering. I'm curious ..

    Soldering the components shouldn't be a problem. I hope the SMD pads are not too small and can be soldered well.






    Example of the first case








    Greetings. Rolf
    Last edited by Rolfdegen; 04-14-2021 at 05:03 PM.

  13. #138
    I'm sure Andre is a great guy, but Jeannie needs some new friends out here in California!

  14. #139
    Senior Member Rolfdegen's Avatar
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    Yes.. I think so

  15. #140
    Senior Member Rolfdegen's Avatar
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    Hello dear Synthi friends ..


    We have now checked our "Jeannie" and everything works flawlessly. Andre listened a little more closely with his trained ears and noticed distortions in the sound.


    Measurements have confirmed this. The cause is a non-linearity in the PT8211 DA converter used.


    Here the measurement on the PT8211 with 4x oversampling (176KHz) and 500Hz sine tone. The non-linear distortion creates new frequency components (1000Hz, 1500Hz, 2000Hz ..) which are added to the original sound.




    At the moment we are wondering whether we should use a better converter in the Jeannie, e.g. PCM5102A. I have already taken measurements with a PCM5102A on the Jeannie.


    Distortions and the noise floor are much better (see picture).


    PCM5201A




    Greetings Rolf

  16. #141
    Senior Member Rolfdegen's Avatar
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    Since the DAC chip (PCM5102A) cannot be easily soldered, we considered using a ready-made converter board (3-6 euros) and plugging it onto the mainboard from behind.


    This eliminates the difficult soldering of the SMD components. The circuit boards are already available on the Internet for a few euros and cost almost as much as the converter chip alone.




    32Bit DAC PCM5102A converter



    Greetings. Rolf

  17. #142
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    Is is that DAC Chip which is used by the Raspi Hifi DACs?

  18. #143
    Senior Member Rolfdegen's Avatar
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    I tested the 24Bit ES9023P from HIFIberry DAC+ light. It works well too.

    But we will be using a 32Bit PCM5102A. It's a DAC with better quality.
    Last edited by Rolfdegen; 04-19-2021 at 06:44 PM.

  19. #144
    Senior Member Rolfdegen's Avatar
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    Hello..


    There are a few more changes. My friend Andre is changing the Jeannie circuit board and integrating the PCM5102A DAC converter.


    Like the other boards, the DAC converter is also mounted on the back as a plug-in module.


    The difficult SMD soldering is no longer necessary. I have already installed the DAC converter module on my Jeannie (picture).








    First sound impressions from Jeannie with a new PCM5102A DAC converter


    Video: https://youtu.be/H6IjdVNptUU


    Greetings from germany. Rolf
    Last edited by Rolfdegen; 04-25-2021 at 03:21 PM.

  20. #145
    Senior Member Rolfdegen's Avatar
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    The Fx module


    The Fx module is plugged into the marked socket strips on the back of the Jeannie.


    It contains a SPIN FV-1 24Bit DSP with 15 effects. The first 7 effect programs are set as standard in the DSP.


    The remaining 8 programs are stored in an EEPROM (24LC32A) and can be changed by the user. The software for this is freeware.





    The Fx menu


    With P1 - P3 the parameters for the effect can be adjusted. The parameter is selected with "SEL" and changed with "VAL".


    With "Mix" the effect signal is mixed with the audio signal of the synthesizer. With "PRG" you select the effects.


    A special feature is the adjustment of the "ClK" clock rate for the FX chip. The clock rate can be changed from 10KHz to 60KHz.


    This enables delays of up to 2 seconds in length.


    Greetings Rolf

  21. #146
    Senior Member Rolfdegen's Avatar
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    Hello..


    The changes to the hardware of the Jeannie are now complete.


    We had a few minor problems with the power supply and could solve that now.

    Before new boards are ordered, everything is thoroughly tested again and fine-tuned new sounds.


    There is a 2nd preview from Andre with very nice sounds from "Jeannie"




    Youtube: https://youtu.be/V-1fEZYGhbw

  22. #147
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    You're using KiCad, right?

  23. #148
    Senior Member Rolfdegen's Avatar
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    No. Its Target 3001

    Link: https://www.ibfriedrich.com/de/index.html

  24. #149
    Senior Member Rolfdegen's Avatar
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    Hello dear Synthians (:


    We have built in a small distortion stage in front of the digital filter in the software (picture).


    One voice



    The distortion stage consists of an AMP with an adjustable gain of 0.25 - 1.75


    I placed the function in the oscillator menu and called it Overdrive (ODRIVE).


    This can be used to program a distorted or screaming jazz organ, for example.



    Greetings. Rolf

  25. #150
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    Hello ,
    I would like to introduce myself first. My name is Andre , the man behind TubeOhm . After several projects Rolf and I are now working on the Jeannie. While Rolf does the programming/circuitry I do also the circuit design the conception/theoretical development of the synth and the circuit boards and later also the DIY kits .
    I am happy to be here in the forum. Maybe someone has questions or suggestions and maybe we need your help to finish the project.

    So, Rolf has just programmed the velocity dynamics.
    Very useful I think. Of course I tested it immediately and made a 'little velocity song'.

    https://soundcloud.com/tubeohm-sound...e-jeanie-musik

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