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  • Rolfdegen's Avatar
    Today, 09:15 AM
    Hallo Graham Thank you for your very good explanation. I will think about it for my project. :confused: Greetings from germany. Rolf My little "Jeannie" Synthesizer Prototyp
    12 replies | 251 view(s)
  • Rolfdegen's Avatar
    Yesterday, 08:23 PM
    Yes. Thank you for the information. The cutoff frequency now follows the midi note. It wasn't exactly before. For filter velocity to 7 octaves, we have limited the resonance to 4.0. Direct input of the filter...
    12 replies | 251 view(s)
  • Rolfdegen's Avatar
    05-15-2021, 06:58 PM
    This is the table for the filter tracking values. The middle frequency is 440Hz. The filter corner frequency and resonance is shifted 100% with keytracking. const static float KEYTRACKINGAMT = { ...
    12 replies | 251 view(s)
  • Rolfdegen's Avatar
    05-15-2021, 11:12 AM
    In the TSynth the key tracking is monophonic. I made it polyphonic in the Voices polyphone KeyTracking //************************************************************************* // play Voices...
    12 replies | 251 view(s)
  • Rolfdegen's Avatar
    05-15-2021, 10:48 AM
    I want to control the filter tracking over seven octaves with midi notes. These are the keytracking values (Signal) for the FilterModMixer input. Greetings Rolf
    12 replies | 251 view(s)
  • Rolfdegen's Avatar
    05-15-2021, 10:13 AM
    The calculation must work according to this formula. Signal is Filter.tracking value. For frequence shift with 1.octav is signal value 0.14285 (7 octaves) I can't find that in your code.
    12 replies | 251 view(s)
  • Rolfdegen's Avatar
    05-14-2021, 01:15 PM
    Hallo friends I'm using the Teensy Audio Lib for a state variable filter. I control the filter frequency for key tracking via the frequency control input. The filter's corner frequency is set via...
    12 replies | 251 view(s)
  • Rolfdegen's Avatar
    05-02-2021, 03:45 PM
    Hello dear Synthians (: We have built in a small distortion stage in front of the digital filter in the software (picture). One voice
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    05-01-2021, 05:19 PM
    No. Its Target 3001 Link: https://www.ibfriedrich.com/de/index.html
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    05-01-2021, 12:28 PM
    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...
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    04-28-2021, 05:02 AM
    Hallo John.. Thank you for your development work. I will test it in my synthesizer. :) Greetings from germany. Rolf
    20 replies | 1328 view(s)
  • Rolfdegen's Avatar
    04-25-2021, 02:12 PM
    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. ...
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    04-25-2021, 02:10 PM
    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...
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    04-21-2021, 06:48 PM
    Thanks all for the information. The PCM5102A (right) has very good values for harmonic distortion. I think I using this DAC in my Synth. :)
    14 replies | 666 view(s)
  • Rolfdegen's Avatar
    04-20-2021, 10:17 PM
    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)
    14 replies | 666 view(s)
  • Rolfdegen's Avatar
    04-19-2021, 09:42 PM
    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.
    14 replies | 666 view(s)
  • Rolfdegen's Avatar
    04-19-2021, 05:33 PM
    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.
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    04-19-2021, 02:49 PM
    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...
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    04-19-2021, 02:47 PM
    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...
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    04-18-2021, 08:07 PM
    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. Link:...
    14 replies | 666 view(s)
  • Rolfdegen's Avatar
    04-18-2021, 08:00 PM
    I made another measurement with PCM5201A and 44.1KHz in my Teensy 4.1 . It's a good result.
    14 replies | 666 view(s)
  • Rolfdegen's Avatar
    04-18-2021, 07:49 PM
    A friend made this measurement with PT8211
    14 replies | 666 view(s)
  • Rolfdegen's Avatar
    04-18-2021, 07:41 PM
    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 improvement.
    14 replies | 666 view(s)
  • Rolfdegen's Avatar
    04-18-2021, 07:05 PM
    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 rate for PT8211 to...
    14 replies | 666 view(s)
  • Rolfdegen's Avatar
    04-14-2021, 04:21 PM
    Yes.. I think so :cool:
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    04-14-2021, 03:45 PM
    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
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    04-13-2021, 12:17 PM
    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:...
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    04-12-2021, 07:31 AM
    @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...
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    03-23-2021, 01:00 PM
    LUT version is a good suggestion. This is done in the 8Bit Shruthi Synthesizer from Mutable instruments. // Copyright 2009 Olivier Gillet. // // Author: Olivier Gillet (ol.gillet@gmail.com) // // This program...
    20 replies | 1328 view(s)
  • Rolfdegen's Avatar
    03-23-2021, 12:44 PM
    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
    152 replies | 16952 view(s)
  • Rolfdegen's Avatar
    03-22-2021, 12:54 PM
    Hallo friends.. Now we are done and we start producing circuit boards in China :)
    152 replies | 16952 view(s)
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About Rolfdegen

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About Rolfdegen
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Germany
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Music, Electronic

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