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  1. No it appears that Paul found out the USB volume...

    No it appears that Paul found out the USB volume is logarithmic... Your library is fine, anybody's application can control your library in a logarithmic way. The volumes on the library could have the...
  2. Hi Paul, Yes logarithmic volume sliders are...

    Hi Paul,


    Yes logarithmic volume sliders are better than linear. Interesting that windows does this that way, but it's a good thing for audio. Our ears don't hear linearly so they setup the...
  3. Ahh, this was going to make my life easy. But no...

    Ahh, this was going to make my life easy. But no because I'm connecting an ESP32 for AUDIO (I2S). The pins they use take too many of the I2S lines. Has anyone mentioned blackketter's board? You can...
  4. R2 and R3 need to bring 3.0v down to ~< 2.9. ...

    R2 and R3 need to bring 3.0v down to ~< 2.9.

    20343
  5. I found my answer in TI's documentation called...

    I found my answer in TI's documentation called Voltage Supervisor and Reset ICs: Tips, Tricks and Basics. In order to have an "AND" operation with two supervisors I needed to have an "open drain"...
  6. These parts monitor the level of the VDD (voltage...

    These parts monitor the level of the VDD (voltage source). The TLV320ADC6140 has IOVDD and AVDD power supply options. My design has options for single supply, or a separate AVDD power supply, which...
  7. Correct. I've left a 2.54 stack-able header...

    Correct. I've left a 2.54 stack-able header compatible through-hole in my custom "Audio Footprint" that would allow the MC2 and O1B to be passed along to any sub-board. But to get it to that pin...
  8. Hello, Thank you for your thoughtful...

    Hello,

    Thank you for your thoughtful responses.



    That is correct. My target is the TLV320ADC6140. It's about 95% completed, and hope to order this week. The SHDNZ pin (aka RESET, as far as...
  9. Hello, I have a question regarding my project...

    Hello,

    I have a question regarding my project overall, and I'm hoping to get input from people who have a lot of experience with the Teensy Audio Library.

    What is the best pin to use for a...
  10. mhelin, Still not convinced that it will be...

    mhelin,

    Still not convinced that it will be helpful. But it's interesting nonetheless and was easy to add. I added 4 pins, corresponding to the 4 data lines required for clocks and data.
    ...
  11. The miniDSP was just extra... The Teensy has the...

    The miniDSP was just extra... The Teensy has the "DSP" so having the miniDSP on the PCM5242 is overkill I think for most things. But I selected this chip for it's simple and effective quality. I...
  12. Hello alrj, Once the project is complete, I...

    Hello alrj,

    Once the project is complete, I will sell the boards via Tindie. You'll be able to buy pre-populated kits. My goal is to sell them affordably, but with some profits to support the...
  13. Hello, Yes it's up and running!!! I'll post...

    Hello,

    Yes it's up and running!!! I'll post more about it sometime next week. I'll be ordering my re-spun board, along with the ADC this week. :-)
    ...
  14. Teensy 4 Audio Library with ASIO4ALL for Low-Latency Playback

    Hello,

    I'm testing my new DAC, and opened Ableton Live 10 Suite to see if I can use the DAC with it. I was hoping ASIO4ALL would work but I'm getting the following error.

    20233

    Live does...
  15. Can anyone please tell me the clock speed for...

    Can anyone please tell me the clock speed for MCLK, BLCLK, and LRCLK when the Teensy is in I2S mode? What's the clock speeds on TDM mode?
  16. Hello, Updating the fact that I have in hand...

    Hello,

    Updating the fact that I have in hand my first prototypes. I wired them up, and I can send and receive I2C data. However, no audio yet. I'm currently talking with TI to see which register...
  17. Teensy 4.0 PCM1865 Audio Shield - 4 channel ADC with balanced/single ended + preamp

    Hello Friends,

    I'm now posting regarding my Teensy 4.0 PCM1865 Audio Shield. This is part of a larger project to create a many input, many output digital mixer. But I believe the cards could be...
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    Hello, I sent in the pull request on github...

    Hello,

    I sent in the pull request on github for the footprints and symbols. Let me know if you have any questions about them. Thx.

    I just finished setting up a layout for a new...
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    Lol. blackketter, thanks for the...

    Lol.



    blackketter, thanks for the information!




    I'm now working on a Teensy 4 ESP32 Audio Shield with a mating footer to this breakout board. I'm trying to debate the pros and cons of...
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    Correct, I've successfully done this on a...

    Correct, I've successfully done this on a breadboard. :-) I've fed bluetooth audio that's being received by the ESP32 into the I2S of the teensy and sent it out the output of the audio shield.


    ...
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    Hello blackketter, Great work. Thank you! I...

    Hello blackketter,

    Great work. Thank you! I notice the Teensy 4.0 ESP32 / USB Host / MicroSD Breakout Board. Very nice.

    I'm interested in something similar but I want to use A2DP audio...
  22. I feel bad, that we took over that other thread...

    I feel bad, that we took over that other thread regarding pins. It was my mistake, for posting that question there. This information is helpful here...





    So my question on that other thread...
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    Hello Palmerr, I came across this thread...

    Hello Palmerr,

    I came across this thread looking for information on the SPI for audio. I notice you have some jumpers for selecting a SCK, and a MOSI. I'm actually a little confused by how it's...
  24. Noted. The Teensy pin numbers frustrate me a...

    Noted. The Teensy pin numbers frustrate me a little. Only because matching the Pins from the pinout to my kicad footprint is a pain. I wind up confusing pin numbers from Teensy pin numbers, etc. I...
  25. No worries. It's nice to hear from you, I...

    No worries. It's nice to hear from you, I recognize your work on the new CS42448 board.



    I was browsing around your work and appreciated your header pins. Including the power in them will help...
  26. Since I had many requests for memory, sd, and...

    Since I had many requests for memory, sd, and other features, I designed another board to stack on top. It's the Teensy 4.0 Audio Toolkit Shield. These PCM5242 cards are really meant to do one thing....
  27. Hello MichaelMeissner, Great idea! I haven't...

    Hello MichaelMeissner,

    Great idea! I haven't finalized the order of those pins until I start routing the tracks. I'll organize them logically. But the idea is that the long header row can be used...
  28. Update - Localized Symbols, Footprints, and...

    Update

    - Localized Symbols, Footprints, and 3d models so it should be easier to download.
    - Fixed up MIDI schematic. There still may be errors...
    - Create a "Disable Ratsnest" which is just...
  29. Note to self... - Add I2C Expansion header,...

    Note to self...

    - Add I2C Expansion header, add pull up resistors with pull-up enable jumper.
    - Add resistor to MCLK, as recommended.
    - Finish connecting all labels to jacks and headers. ...
  30. PS - It dawned on me to expose the SAI pins on...

    PS - It dawned on me to expose the SAI pins on this device, so I did. This should make breadboarding audio modules much easier.

    Updated...

    19645

    19646
  31. Teensy 4.0 Audio Toolkit and Shield - An Open Source Audio IO Project in Kicad

    Hello Friends,

    I hope you find this helpful. The project is incomplete - but I spent a lot of time organizing my thoughts on this. I'm excited to get feedback from the community.

    19643
    19644...
  32. Thanks for your input. It's very helpful. ...

    Thanks for your input. It's very helpful.



    Chris on facebook suggested both micro-SD and flash memory. I think another board that can be inserted into "the stack" would be better than stuffing...
  33. Teensy 4 PCM5242 Audio Shield - Stereo Balanced/Single Ended DAC Module

    Hello,

    I'd like to introduce a Teensy 4 PCM5242 Audio Shield.

    It's part of a larger project to create a digital mixer based on the Teensy 4. I've experimented with a few different designs,...
  34. Instead of CS5343, why not pick an ADC that's...

    Instead of CS5343, why not pick an ADC that's balanced, like the other 6 inputs? Just a thought.
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    Ok, yes. Thanks for pointing that out. My...

    Ok, yes. Thanks for pointing that out. My original reply regarding the renaming of SAI ports was on topic but my project wasn't. I'll build one of these and then create a new post with my findings...
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    I didn't ask anything specific but would love to...

    I didn't ask anything specific but would love to hear your feedback on my digital audio mixer project details so far. Would a schematic help to get feedback? I haven't decided how far I want to share...
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    Shouldn't this be labeled as SAI1A, SAI1B, SAI1C,...

    Shouldn't this be labeled as SAI1A, SAI1B, SAI1C, SAI1D, SAI1E, and SAI2IN SAI2OUT? For my project I'm going to be converting some of the outputs as inputs. The OUT1A, OUT1B, OUT1C, OUT1D can be...
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    This conversation is interesting... Is this a...

    This conversation is interesting... Is this a similar process to "Anti-aliasing"? If I'm not mistaken, antialiasing for a DAC is the process of "smoothing out" the rhythmic pulse of a digital audio...
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    Thank you. I understand. So then how is anyone...

    Thank you. I understand. So then how is anyone running audio based sketches on the audio board or otherwise? Let's say ToneWaveSweep? It errors on compile.
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    USB Type Audio for Teensy 4 doesn't Show

    The only option in the Board Type menu for the Teensy 4 in both the current and beta versions is Serial. I don't see an option for Audio. Please excuse me if this is a trivial question. I appreciate...
  41. I kinda agree, it's a little extreme. It was a...

    I kinda agree, it's a little extreme. It was a good learning experience though. I'm now working on placing the chips I want to use directly onto the board, and skipping the Breakout Board altogether....
  42. I'm designing based on the FreeDSP Expansion...

    I'm designing based on the FreeDSP Expansion Connector.

    17513



    I thought about adding 3.3 and 5v to the FreeDSP connector (at the end of the connector), but people on DiyAudio.com suggested...
  43. Teensy 4.0 Bluetooth A2DP Wireless Audio Stream to I2S

    Hello,

    My project requires a Bluetooth A2DP Sink that is the fed to the Teensy 4 via I2S. I'm leaning towards an ESP32 chip connected to the Teensy for both control over its Bluetooth pairing...
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    Can you please post a link to he right datasheet?...

    Can you please post a link to he right datasheet? I'm also not finding the 5 data pins on the first SAI. I did find a note about 4 data pins in the application note but not 5. I wanted to read up...
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    Paul, can you please confirm that the exposed USB...

    Paul, can you please confirm that the exposed USB pins (other than the one hard soldered on) can be configured to effectively operate the same way? Are the two USB pins interchangeable? Can they both...
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    I agree, microusb is easily broken. I prefer 5...

    I agree, microusb is easily broken. I prefer 5 pin USB headers, so I can connect my own USB port. Pro audio gear still uses USB B for devices. It's much larger and robust. So I would likely try to...
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    From the PCM5102A datasheet...

    From the PCM5102A datasheet, "The serial audio interface typically has 4 connections SCK (system master clock), BCK (bit clock), LRCK (left right word clock) and DIN (data). The device has an...
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    The PCM5102A doesn't have software control, it's...

    The PCM5102A doesn't have software control, it's a hardware DAC. You'll have a digital volume, processed by the Teensy. Place it inline of the audio project on the audio design tool. Then you can...
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    OK, I'll still incorporate it into my breakout...

    OK, I'll still incorporate it into my breakout board. Then when there is time or interest, it will make testing easier. Does the schematic look right? Thanks Paul. I'm excited to work with this new...
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    In case you missed it, I documented the...

    In case you missed it, I documented the connections in a previous post. It seems to have resonated with many people because I hear about this chip being used with the Teensy a lot. :-)
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