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Thread: [queued] TSynth - Two Oscillator Polysynth

  1. #26
    Junior Member
    Join Date
    Feb 2020
    Location
    The Netherlands
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    5
    Hi UHF,
    The PCB and front panel look great. You do fantastic work. Where did you make this in?

  2. #27
    Hello, I'm using KiCAD. I'm trying to get a decent looking front panel silkscreen and am also playing about with Eagle on Fusion 360. The front panel will be red with white graphics, although JLC offer other colours including matt black. The components are chosen so that you can get them from a 'proper' supplier (like Mouser, RS, DigiKey...) or go to AliExpress and save, because most of them are fairly standard. The 4067 MUXs and MIDI optocoupler components will be SMDs that JLC will assemble onto the main PCB. They'll probably be offered on Tindie or whatever, I need to actually make one first though! I also need to do another demo video, as I want people to appreciate the range of sounds that it's capable of.

  3. #28
    Junior Member
    Join Date
    Feb 2020
    Location
    The Netherlands
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    5
    Hi UHF,
    I just came across a board that is not available yet named DAISY. It is on Kickstarter. Maybe it is worth checking out, always good to know what others are doing. https://www.kickstarter.com/projects...form-for-music
    Last edited by nixward; 02-26-2020 at 08:48 PM.

  4. #29
    A monosynth for $399 hmmm... or a programmable poly for $99.

  5. #30
    Junior Member
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    Feb 2020
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    The Netherlands
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    5
    Yes that is a big difference

  6. #31
    Junior Member
    Join Date
    May 2019
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    6
    Hi, do you plan to release the schematics for this impressive project

  7. #32
    Hello, thanks for all the interest. This will probably be a last update. Further information for those interested will be here electrotechnique.cc. The PCBs arrived last week and I'm pleased with the results. The prototype is shown below and is fully working with updated code. I'm anticipating that it will be ready by May and the website will be updated with all the files, including plans for an enclosure. It is open source with the exception of the files to create the PCBs. I'm hoping users will contribute to the code. A Teensy 4 version will be available when it's in a larger form factor, supporting the same functionality.

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  8. #33
    Member
    Join Date
    Jan 2015
    Location
    Toms River, NJ USA
    Posts
    37
    Very cool. Why didn't I see this thread before!

    I very recently built the Notes & Volts TSynth and while is was pretty good, I was also disappointed by the anti-aliasing of the saw and square waves. Could you explain how you solved that problem, or am I using an old version of something?

  9. #34
    Senior Member
    Join Date
    Oct 2015
    Location
    Roma (IT, EU)
    Posts
    336
    Wow, super project!
    Fantastic!!
    Congratulations!!!

  10. #35
    Junior Member
    Join Date
    May 2019
    Posts
    6
    This is my Tsynth (Headless, all editing over USB or MIDI).

    Click image for larger version. 

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  11. #36
    This really looks great, congratulations

  12. #37
    Very nice to see how your synth is coming along and of course I am flattered you are using my ensemble chorus code.

    I have a "string machine" project using the Teensy 3.6 with a Blackaddr interface board. I managed to get lucky drilling holes in a Hammond box and have it cased nicely. String machine code is here: https://github.com/quarterturn/teensy3-string-machine

    Main problem preventing it from being something I'd ever consider selling is the 16-bit nature of the audio library. It's just not enough bits when you start summing a lot of waveforms or voices. I have to cut the gain by 25% at each mixer input stage to reliably avoid digital clipping. I know Paul has said he chose 16-bit to align with the M7 floating point but I'd gladly trade that for 32-bits in the processing path. I'll admit I'm selfishly waiting for someone else who is better at c++ to do the 32-bit conversion dirty work. I could probably handle something like writing exponential curve functions for the ADSR envelope waveforms. I would really like to have the sound of exponential decay on the release phase, it sounds so much more natural than a linear ramp.

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