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    Hello dear Synthians (: We have built in a...

    Hello dear Synthians (:


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


    One voice

    https://i.ibb.co/pZCKHHJ/TSynth-1-Voice.jpg
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    No. Its Target 3001 Link:...

    No. Its Target 3001

    Link: https://www.ibfriedrich.com/de/index.html
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    Hello.. The changes to the hardware of the...

    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,...
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    Hallo John.. Thank you for your development...

    Hallo John..

    Thank you for your development work. I will test it in my synthesizer. :)

    Greetings from germany. Rolf
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    The Fx module The Fx module is plugged into...

    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...
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    Hello.. There are a few more changes. My...

    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...
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    Thanks all for the information. The PCM5102A...

    Thanks all for the information.

    The PCM5102A (right) has very good values for harmonic distortion. I think I using this DAC in my Synth. :)

    https://i.ibb.co/M1VRxRM/PCM5102-A-FFT-Plot.jpg
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    Mixer Behringer QX1222USB Link:...

    Mixer Behringer QX1222USB

    Link: https://www.behringer.com/behringer/product?modelCode=P0AKX

    The measurement signal goes in Mixer analog in and USB out (16Bit 48KHz Samplerate)
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    I use 32Bit DAC PCM5102A and Audacity. The...

    I use 32Bit DAC PCM5102A and Audacity.

    The 440Hz sines wave is generated by AudioSynthWaveform from Teensy 4.1 and LCK 44.1KHz, BCK 2.857MHz.
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    I tested the 24Bit ES9023P from HIFIberry DAC+...

    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.
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    Since the DAC chip (PCM5102A) cannot be easily...

    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...
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    Hello dear Synthi friends .. We have now...

    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.
    ...
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    I am not satisfied with the PT8211. It sounds bad...

    I am not satisfied with the PT8211. It sounds bad in my DIY synthesizer. Because of this, I want to use a different DAC.

    The PCM5102A sounds very good and works very well with Teensy 4.1.
    ...
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    I made another measurement with PCM5201A and...

    I made another measurement with PCM5201A and 44.1KHz in my Teensy 4.1 . It's a good result.

    https://i.ibb.co/LZyD2Tw/PCM5102-A-44-1-KHz.jpg
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    A friend made this measurement with PT8211 ...

    A friend made this measurement with PT8211

    https://i.ibb.co/rdV35XZ/Analog-Sin.png
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    I also measured at 44.1KHz and found no harmonic...

    I also measured at 44.1KHz and found no harmonic distortion with PCM5102A and ES9023P. Only harmonic distortion with PT8211.

    Increasing the sample rate to 88.2KHz with the PT8211 was no...
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    24 Bit DAC for Teensy

    I tested different 24bit DACs on my Teensy 4.1.


    1. PT8211 16-bit DAC
    2. PCM5102A 32-bit DAC Burr Brown
    3. ES9032P 24Bit DAC HIFIberry Board

    Here are spectrum analysis from DACs. The sample...
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    Yes.. I think so :cool:

    Yes.. I think so :cool:
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    My friend Andre is busy soldering. I'm curious .....

    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. :)
    ...
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    Hello.. It won't be long before we can hold...

    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.

    ...
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    @alfrede We are waiting for the first boards. It...

    @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...
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    LUT version is a good suggestion. This is done in...

    LUT version is a good suggestion. This is done in the 8Bit Shruthi Synthesizer from Mutable instruments.




    // Copyright 2009 Olivier Gillet.
    //
    // Author: Olivier Gillet...
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    Hi Daniel The PCB boards or DIY kit with case...

    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...
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    Hallo friends.. Now we are done and we start...

    Hallo friends..

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

    https://i.ibb.co/6DvvHGC/Jeanny-PCB1.jpg

    https://i.ibb.co/P1MbYKT/Jeanny-PCB2.jpg
    ...
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    Hallo friends :) The board is now ready. We...

    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...
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    It is progressing .. The 3D model of the...

    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.
    ...
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    what was the issue :confused:

    what was the issue :confused:
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    Please. Can you draw that ?

    Please. Can you draw that ?
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    Hello Edwin. Thanks for the good tips. I will...

    Hello Edwin. Thanks for the good tips. I will check it.

    Greetings. Rolf
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    Power circuit for my teensy synth.. Link:...

    Power circuit for my teensy synth..

    Link: https://forum.pjrc.com/threads/63255-New-Teensy-Synth-quot-Shruthi-2-quot?highlight=Teensy+Shruthi

    23898

    23899

    23900
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    The 1st draft in 3D ...

    The 1st draft in 3D

    https://i.ibb.co/zXbw5jK/Jeanny1.jpg
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    The design is not final yet :confused:

    The design is not final yet :confused:
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    New "Jeannie" layout.. ...

    New "Jeannie" layout..

    https://i.ibb.co/7WnLZdn/Jeannie-MCU-3-0.jpg

    The rectangle below the display is the Fx module. This is put on the underside.

    Greetings. Rolf
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    Hallo Chris :) Thanks. When I'm done with the...

    Hallo Chris :)

    Thanks. When I'm done with the development I will upload my project to Githup. Its free.

    I use the Arduino Lib for the graphics. Parameter settings are converted for a resolution...
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    Hello Friends.. Our progress cannot be...

    Hello Friends..


    Our progress cannot be stopped. This time we really accelerate.


    The Fx PCB is ready. Now we has started to route the "Jeannie" mainboard. I'm curious..


    Fx board
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    Hello friends.. We have started to route the...

    Hello friends..


    We have started to route the boards. I'm curious how big they will be.


    Fx board
    https://i.ibb.co/d5Fm1bp/Fx.jpg

    Greetings from germany. Rolf
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    Hello and have a nice Sunday :) There are a...

    Hello and have a nice Sunday :)


    There are a few changes in the circuit diagram. The DAC output (PT8211) on the Teensy Board has an active 32KHz LowPass filter. This reduces high-frequency...
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    Hello again.. :D The prototype of the Fv-1...

    Hello again.. :D


    The prototype of the Fv-1 circuit is now completely soldered and works flawlessly. Will be a little smaller later because of SMD
    and relocation of the power circuit (+/- 5V) to...
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    Sorry.. double post

    Sorry.. double post
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    Hello Tomas I am using a 6N137. Pin 7 is...

    Hello Tomas


    I am using a 6N137. Pin 7 is Monitoring node and does not have to be connected.

    https://i.ibb.co/w6hHbdG/6N137.jpg

    Greetings from germany. Rolf
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    Hello friends :) It is progressing. Corona...

    Hello friends :)


    It is progressing. Corona also has something positive. You spend more time at home and on your computer.
    Before I start laying out the boards, I want to know if everything...
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    Thanks for your good ideas. There is hardly any...

    Thanks for your good ideas. There is hardly any space left on the circuit board.

    It's open source and you can change it if you want :)
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    Hallo Daniel That is not provided in Jeannie....

    Hallo Daniel

    That is not provided in Jeannie. We want to build this synthesizer very small and inexpensive with good sound.

    But maybe in an XT version with many pots ans knops :mit den Augen...
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    Hallo friends.. Here are complete Jeannie...

    Hallo friends..

    Here are complete Jeannie circuit diagram with FV-1 card. PWM1-4 and SPIN1-4 are Spin FV-1 control lines.

    MCU unit
    https://i.ibb.co/26trr1f/Jeannie102-MCU.jpg

    Control unit...
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    Hallo.. This function is not intended. But the...

    Hallo..

    This function is not intended. But the key that was pressed first becomes active.

    Today I got the FV-1 chips. These are 28 pin SMD chips but it's not difficult to solder. For...
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    The Spin FV-1 effect module is mounted on the...

    The Spin FV-1 effect module is mounted on the back of the Jeannie board.

    https://i.ibb.co/N9PkSPT/VF-1-01-1.jpg

    This is an old PCB version. I built it into my other DIY synthesizer...
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    Hallo friends :) This is the control unit from...

    Hallo friends :)

    This is the control unit from Jeannie. For the button query, I use an ADC input to save output lines on the Teensy Board.

    The LED Driver IC8 is controlled via the same SPI bus...
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    Yes that would be good. The envelope code would...

    Yes that would be good. The envelope code would have to be changed for this :confused:
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    Hello friends.. I adjusted the envelope Attack...

    Hello friends..

    I adjusted the envelope Attack time from 1ms to 0.25ms . That makes more punch with percussion sounds.



    1ms
    https://i.ibb.co/dct59rS/Envelope1ms.png
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    Small update .. :cool: The envelopes also...

    Small update .. :cool:


    The envelopes also get a delay and hold parameter. These two parameters will be added to the graphic later.
    In addition, there is a peak meter in the header for checking...
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