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  1. Replies
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    Hey guys, is the USB-C connector for programming...

    Hey guys, is the USB-C connector for programming on the microMod board itself or are those pins brought out the the M.2 connector? Being able to to do our own USB connector on a custom carrier board...
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    The very short answer is yes, there would be too...

    The very short answer is yes, there would be too much overhead to process audio in blocks of 1 sample at a time, performance would be very poor. There is a direct tradeoff between latency and...
  3. Hi Paul, I've been very interested in this new...

    Hi Paul, I've been very interested in this new feature and the limitations are okay with me. Is there any examples on how to use this with the onboard flash? I couldn't find examples of the following...
  4. If you need even more I/O pins then are broken...

    If you need even more I/O pins then are broken out on the TGA Pro, you can solder wires to directly to any unused pins on the TGA pro socket (the solder joints that are on the opposite side that the...
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    This is very similar to what I need for a high...

    This is very similar to what I need for a high volume product I'm working on. I've been looking at having to spin my own Teensy board because I need:
    - the USB programming interface broken out to a...
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    Hi Edwin, no, I think I made a mistake. My...

    Hi Edwin, no, I think I made a mistake. My previous post was on a phone via email link and I thought the comment was directed at me (misread, my fault = apologies), but I think they were intended for...
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    Hi Edwin, thanks for the feedback. I've tried to...

    Hi Edwin, thanks for the feedback. I've tried to answer all your questions comments below.

    "In the schematic I see failrly low values of capacitors on the outputs of the voltage regulators,...
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    I designed a high-quality, low-noise audio board...

    I designed a high-quality, low-noise audio board for use with guitar and Teensy. The schematic is freely available in the boards documentation. You can use that as a reference.

    Teensy Guitar Audio...
  9. It less likely the noise is getting from the I2C...

    It less likely the noise is getting from the I2C stream into the I2C stream (digitally) due to SW bug. It's probably more likely the noise is coupling from the digital circuits into the analog...
  10. Bumping this again. @Paul Any chance of...

    Bumping this again. @Paul

    Any chance of getting his update permanently added to the Teensy's platform.txt? It's seems it should be low risk, shouldn't break anything and bring it up to date with...
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    I'm also interested in I2C DMA for T4. I've got...

    I'm also interested in I2C DMA for T4. I've got an I2C OLED that I'm using as a simple display for an audio effect. Driving an I2C display requires pushing a moderate amount of data, but as a result...
  12. Is it the proprietary protocol for a specific...

    Is it the proprietary protocol for a specific product you're asking for?

    I'm not specifically familiar with how those devices are recognised but there are a few possibles, all of them an...
  13. Teensy does have a MIDI library. You would need...

    Teensy does have a MIDI library. You would need to make a board to hold your Teensy and add midi output circuitry (it's not complicated). Make sure you pick a Teensy that will have enough analog...
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    In case anyone is examining the schematic, the...

    In case anyone is examining the schematic, the Teensy actually uses an LDO to generate it's 3.3V, but since that supply is feeding all the digital circuits on the Teensy, the loads induce noise on...
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    The POG is believed by some to use a standard...

    The POG is believed by some to use a standard vocoder structure, but with quite a bit of secret sauce in how to separately handle transients vs harmonic content and deal with short FFT intervals,...
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    Most guitar pedals don't need to have resilient...

    Most guitar pedals don't need to have resilient power supplies because most have no digital circuits inside them. When powered by batteries, you get lowest PSU noise because batteries have no noise...
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    Ground loops tend to pick up 60Hz hum from the...

    Ground loops tend to pick up 60Hz hum from the mains, lighting, nearby refrigerators, etc. They are less likely to pick up digital interference. Digital interference is picked up by analog wires...
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    Sounds like you aren't linking the proper object...

    Sounds like you aren't linking the proper object files in your project and it can't find the constructor function. I would recommend you try to use the Arduino IDE first, and when you get that...
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    Anyone have issue with adding links to associated...

    Anyone have issue with adding links to associated 'maker boards' that use Teensy Audio Library and supported hardware? There are a number of related community-driven projects on Tindie, codec boards...
  20. I found out personally that Kickstarter is not...

    I found out personally that Kickstarter is not very friendly for international sellers, but I didn't know it had issues with international backers too?
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    I've created a very low-noise Teensy Audio Shield...

    I've created a very low-noise Teensy Audio Shield so I can assure you it can be done. Take a look here for full details, including the schematic: TGA Pro

    For starters with PJRC Audio Board, you...
  22. Yes, can power from your PCB, or via USB but NOT...

    Yes, can power from your PCB, or via USB but NOT at the same time. As long as you never do that you should be fine.

    I also have made a Teensy guitar pedal and while it's not that difficult to get...
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    The SNR of the WM8731 codec is 90dB, but you'll...

    The SNR of the WM8731 codec is 90dB, but you'll never get that in a real guitar circuit. Every component in the entire signal chain add some kind of noise and the CODEC is the lowest source of noise....
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    You didn't mention what you are using it for?...

    You didn't mention what you are using it for? Line-level signals? Guitar signals? Microphone?

    I have a Teensy shield that is optimized for low-noise and guitars but can also used with line level....
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    Hey Pio, for what it's worth, I think your...

    Hey Pio, for what it's worth, I think your existing approach to floats is the best compromised approach. Using floating point from end to end is wasteful of a lot of computation. 16-bit transport...
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    Looks pretty cool! I'll have to give this a try....

    Looks pretty cool! I'll have to give this a try. What is the processor usage % on the T4?
  27. That TI part you've selected looks pretty good...

    That TI part you've selected looks pretty good based on what you're asking for. Personally, I'm partial to the WM8731, mainly because it's decently priced, comes in a TSSOP package (easier to solder...
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    If you're going to be using a SPI memory you...

    If you're going to be using a SPI memory you probably want to be using DMA for transfers so that the CPU doesn't waste cycles busy-waiting. However, DMA only helps you if you've got something else...
  29. You might also want to take a look at the TGA Pro...

    You might also want to take a look at the TGA Pro Audio Board. I specifically designed it for handling both line-level or guitar signals and helping out people who don't want to deal with a lot of...
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    A few years ago forum user unicornpower did this...

    A few years ago forum user unicornpower did this using the JUCE framework. You might be able to leverage his work.

    https://forum.pjrc.com/threads/46864-Developing-Teensy-Audio-effects-as-plugins
  31. Not exactly ideal but if there are no other...

    Not exactly ideal but if there are no other options available I will need them to weigh this option against a panel mount adapter cable.
  32. Paul confirms in a similar thread that the loader...

    Paul confirms in a similar thread that the loader will only work with USB1, it can't work with USB2.

    https://forum.pjrc.com/threads/63956-Programming-from-the-USB-host-T3-6
  33. I suspect that will be sufficient for USB...

    I suspect that will be sufficient for USB functionality once the board is up and running, but my understanding is the the actual programming of the board over USB is accomplished by the code from the...
  34. Thanks for the suggestion. This would in fact be...

    Thanks for the suggestion. This would in fact be the long term plan, but for initial few production runs they need to keep things simple and use Paul's board directly. If a software solution is...
  35. USB programming via carrier board connector instead of micro-USB

    Why would I want to do such a thing?

    I've recommended the Teensy 4.1 to a company looking to make a commercial product. They will require a USB port on the enclosure for user programming and...
  36. Any chance of getting that small addition to the...

    Any chance of getting that small addition to the platform.txt file? Similar changes have been made on other Arduino compatible boards to support the precompiled library feature.
  37. Thanks, I'll try reaching out to Paul directly...

    Thanks, I'll try reaching out to Paul directly then.
  38. Solution for adding support for pre-compiled Libraries

    Anyone know which of Paul's repos on Github is for the Teensyduino files with regards to the following file. I can't seem to find which one it is and I'd like to make a pull request to get support...
  39. You can process the triangle or sawtooth with an...

    You can process the triangle or sawtooth with an IIR filter (look at the CMSIS biquads supported by teensy for accelerated filtering) or use the waveform approach. The latter is is certainly more...
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    Sorry for the very late reply, I missed this...

    Sorry for the very late reply, I missed this message a month ago. To answer you question, if you just want line in, the schematic in the datasheet is suitable. If you want really good noise...
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    The Teensy Audio library supports other codecs as...

    The Teensy Audio library supports other codecs as well. Take a look at any of the control_* files. Those are your options without having to write your own stuff....
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    I've not tried C++17 yet, but I know for sure...

    I've not tried C++17 yet, but I know for sure C++14 is supported fairly well by Teensyduino and for a while now so I would start with that to use something with some more maturity on Teensy. I use a...
  43. Yes, the Teensy 4.1 should be pin compatible with...

    Yes, the Teensy 4.1 should be pin compatible with the primary pins it shares with the Teensy 4.0. I've already ordered a few Teensy 4.1s so I'll be able to confirm everything works with the TGA Pro...
  44. If I recall correctly, you also have a TGA Pro. I...

    If I recall correctly, you also have a TGA Pro. I made an adaptor for people wanting to use the Teensy 4.0 with it.

    https://www.tindie.com/products/Blackaddr/tga-pro-teensy-40-adapter/
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    That number actually sounds spot on to me. The...

    That number actually sounds spot on to me. The SNR spec for the WM8731 is 90 dB on the ADC. Using the 6 dB-per-bit rule, this is 90/6 = 15 bits of usable noise-free bits in an ideal scenario. In...
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    I think you're being a little harsh on this...

    I think you're being a little harsh on this CODEC. All codecs from reliable manufacturers can meet their datasheet specs, but rarely do in a system because it's the design of the system around it...
  47. You are correct, the purpose of this is to fix...

    You are correct, the purpose of this is to fix the direct-DMA capability with the audio buffers which is only broken on the T4. There's no pressing need to make a similar change to the other...
  48. Let me know if you have any problems with the PR...

    Let me know if you have any problems with the PR and I'll look into it. If you also have any ideas on how to accomplish the same thing in a cleaner or more-portable, future-proof way I'd love to hear...
  49. You are right. If we wanted AudioStream to be...

    You are right. If we wanted AudioStream to be more future-proof, we need to have at least two objectives:
    - separate the control information (meta data) from the audio data. This could be done with...
  50. You can use my pull request for cores/teensy4...

    You can use my pull request for cores/teensy4 as-is and it should work for your user code, but you must also make a change in the Audio library, effect_freeverb.cpp to compile. There is a nasty bit...
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