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Thread: Quad channel output on Teensy 3.6

  1. #126
    Member Moo's Avatar
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    Thats great feedback! Thank you Paul - really appreciate that... I will make amendments...

  2. #127
    Member Moo's Avatar
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    Thanks again. I've made the corrections you've suggested, although I was slightly unsure of these things:

    if the decoupling caps for VA should be before or after the ferrite bead.

    if the CAT811T is wired correctly.

    if PIN1 / CS is setup correctly with two resistors and solderable pad options. Due to my inexperience, I wasn't sure how to represent this on a schematic.

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    Last edited by Moo; 03-31-2019 at 08:47 PM.

  3. #128
    Member Moo's Avatar
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    daydreaming about using cs42448 with a teensy...

    al-teensy3.6-cs42448.pdf

  4. #129
    Member Moo's Avatar
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    An artists' impression of a cs42448 eurorack module...

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  5. #130
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    Hallo everybody.
    I made al the mod on teensy 3.2 to work with 2 audioboard and quad-channel.
    I had some issue playing on both board at the same time: i get very fragmented audio on each channel.
    I don't get this problem when I play audio file on only one of the teo audio board. Any suggestion about ho to solve this?
    Thank you vary much in advance

  6. #131
    Quote Originally Posted by Mike McConney View Post
    Here are pictures of a few of the 7 that I have made.

    Attachment 11170Attachment 11171
    Could you by any chance make two or three for me? If yes, what will the price look like?

  7. #132
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    If you make one of these boards, please join the conversation!
    I bought three of these boards back when they came available. After sleeping on the shelf for nearly a couple of years, I grabbed one and set out to do my first SMD build in about 5 years. I can solder up a vacuum tube amp board in about 3 hours, but I designed it so I know where all the parts go. This little guy took me three days of squinting through a microscope and soldering my fingers. It's kinda ugly, and not all of the parts are the right size, but it's finished.

    I popped a T3.2 on top and loaded up the code I made from the fragment on the OSH park page and the original "guitar' code. I wired the mixed to all 8 output channels so I could test them. After fixing a few typos it worked. This will be part of the fourth music synthesizer I have built with a Teensy as the "brain." I tested with a T3.2, so that there were minimal variables in case things didn't work. The T3.6 will be next. This one will be a 6 voice polyphonic hybrid digital /analog synth with Moog style ladder filters for that fat Moog sound. Click image for larger version. 

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  8. #133
    Senior Member PaulStoffregen's Avatar
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    Quote Originally Posted by tubelab.com View Post
    This one will be a 6 voice polyphonic hybrid digital /analog synth with Moog style ladder filters for that fat Moog sound.
    Hope you'll be able to share more info and maybe even a demo video when it's built?

  9. #134
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    Quote Originally Posted by PaulStoffregen View Post
    Hope you'll be able to share more info and maybe even a demo video when it's built?
    Sure. The CS42448 board is the output for 6 audio channels created in the audio library. I have had good luck with the digital oscillators that I have been using. They are 1V/oct or MIDI controlled. Trying to make 6 notes of polyphony with three oscillators per note needs 18 VCO's. You can not keep 18 analog VCO's in tune with each other for more than 5 minutes. I also want to make this thing small enough to fit IN an electric guitar.

    The CS42448 board and Teensy are needed for the next step, which is tweaking out some ladder filter designs and trying out some new ideas on them. The CS42448 / T3.6 will use the same code I'm using in my current Teensy 3.6 synth. Progress will likely be sporadic since I have taken on a contract engineering job that gets first priority. I will post pictures and details as the project progresses.

    The first synth was your audio tutorial on a white breadboard with a bunch of pots wired to it. Number two is a small perfboard still based on and compatible with the tutorial, with 12 pots, 3 push buttons, 3 encoders and 1 V/oct CV / gate inputs added. It can be driven bu a music keyboard. I use the Arturia Keystep since it has 5 pin MIDI, USB MIDI and 1V/OCT I/O.

    Number 3 is a big breadboard with 49 pots, 4 encoders, and 1 V/oct CV / gate inputs. It's still running it's Kickstarter edition of the prototype Teensy 3.6.

    It is seen here on a Youtube demo video. This was before I got the 1V/oct calibrated well enough for the synth to be played with a keyboard or DAW.

    https://www.youtube.com/watch?v=gWf8Ohfw9EU

    I'm including a picture or two of the synth being played on a deck overlooking the Atlantic ocean on a vacation trip. I wanted to set it all up in the sand down by the water but the wind was creating a full on sandstorm which would have ruined it......and my eyes.

    Click image for larger version. 

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    Here is a picture of a Moog style ladder filter breadboard made with vacuum tubes.....it won't fit in the guitar, so i'll keep working on the SMD stuff.

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