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  1. Hi Chip Thanks for your advice. I actually read...

    Hi Chip Thanks for your advice.
    I actually read your post and I am using this command ( to both of my Audio Boards (I am working with quad channels..) this really helps! but, it not enough and I am...
  2. I2S audio board (24bit/96Khz)- Working with 'generic' I2S ADC breakout?

    Hi,

    I am trying to work with the SparkFun ADC breakout https://www.sparkfun.com/products/retired/9365, I wonder if someone have an experience with working on this kind of breakouts or something...
  3. Hi Vincent, Very interesting project! Did you...

    Hi Vincent,
    Very interesting project! Did you manage to solve it?

    I will be happy to get more details and access for the code if that possible!
    I am trying to modify the audio library to work...
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    Dear Revalogics, I will be happy to look at your...

    Dear Revalogics,
    I will be happy to look at your PCB design and other things you have that will help me to build my own audio board...
    I've got the same high noises while using the Teensy Audio...
  5. Hi Paul, I tried to get deep into your code but...

    Hi Paul,
    I tried to get deep into your code but I still didnt figure it out,
    changing the usb_desc params changed the behaviour of the teensy as recording device to react as 4 channels audio card,...
  6. @Stendall thanks for such detailed explanation....

    @Stendall
    thanks for such detailed explanation.
    I understand that I cannot escape from system natural latency
    but If I understood right, 512 buffer should be enough to avoid lagging, but it still...
  7. I will pay attention from now on. one more...

    I will pay attention from now on.

    one more question..
    Once in a few minutes I've got "buffering noises" for a few seconds, and if I reset the ASIO4ALL everything back to normal...
    I tried...
  8. Thanks a lot! changing to 13 solved the...

    Thanks a lot!
    changing to 13 solved the problem~~!!:)
  9. strong noises while adding patchcords to fft256 objects

    Hi,
    I've got some strange noises while adding patchcord\AudioConnection to fft256 module..
    if I remove this patchcords the noise disappear.
    I have recorded the sound with and without the...
  10. Sure. Thanks for reply. Are you familiar with...

    Sure. Thanks for reply.
    Are you familiar with the usb code?
    Please, Can you look at my #26 reply?

    thanks again.
  11. Hi Paul, I am trying to understand the usb libs...

    Hi Paul,
    I am trying to understand the usb libs implementation by reading them with the Universal Serial Bus Device Class Definition for Audio Devices

    Starting with the descriptor, I found the...
  12. Please, does anyone worked with other DAW and can...

    Please, does anyone worked with other DAW and can tell me which driver is the best to get low latency while recieving audio from the teensy ? (AudioOutputUSB)
    Currently I am working with asio4all...
  13. Wow. Thank you so much for this deep...

    Wow.
    Thank you so much for this deep explanations..
    for sure I will check it. I need to order some parts.
    Anyway I will update with results.
    Thanks again!
    Alon
  14. LINE-IN shorted to GND to isolate the piezo, as...

    LINE-IN shorted to GND to isolate the piezo, as you told : no 1K noise..
    10636


    regarding your question, Maybe Paul could answer this question?


    I disabled the HP a week ago and some noises...
  15. Hi Chip, first of all thanks for reply....

    Hi Chip,
    first of all thanks for reply.
    Regarding you question, How is the unity gain buffer will help if I still have only single power supply? I still have to make this "DC coupling" to center...
  16. I tried this but it did'nt change much... I...

    I tried this but it did'nt change much...


    I will try that, but I dont think it enough.
    I tried to feed the the 3.3V from separate DC Power Supply and it didn't reduce the 1Khz noises..

    ...
  17. Noises while feeding analog circuit (pre-amp) from the teensy 3.3v and GND.

    Hi,

    I've got 1Khz (and the harmonics 2K,3K..) noises in the LINE-IN inputs while sampling a Piezo sensors that connected through self-built analog circuit, a pre-amp\Active filter.

    My analog...
  18. Replies
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    @Blackaddr Thank you so much for the detailed...

    @Blackaddr
    Thank you so much for the detailed explanation.
    Do you think that I must re-design the circuit to fit the Teensy Audio adapter(SGTL5000)?
    (I am asking because my knowledge in analog is...
  19. Replies
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    Please, Can you explain how RA7, RA9, CA3,CA5...

    Please, Can you explain how RA7, RA9, CA3,CA5 form a HPF and LPF? (I tried to play with the values in the 1/2piRC and I cant understand how it fits with 20-20Khz)
    and why is it necessary to form a...
  20. :eek: thanks tni, good to know ! The problem is...

    :eek:
    thanks tni, good to know !
    The problem is that I am using the USB Audio type, because I am sending audio to the PC (to connect with MAX MSP).
    Is there any way to filter this noises?
    I...
  21. Thanks... I dont think it will fit my project...

    Thanks... I dont think it will fit my project requirements, and I've got dimensions limits so I am trying to solve it without adding more units.
    I've changed some things and it's better now, but I...
  22. Hi manatok, I experience the same problem, I...

    Hi manatok,

    I experience the same problem, I also have pre-amp, could you please explain what exact changes have you done to solve this noises?
    Does your Analog 5V feeded from seperate power...
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    Alright! Thanks a lot! sorry for hijacking..

    Alright!
    Thanks a lot! sorry for hijacking..
  24. Replies
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    Thanks! I am working with your design(except...

    Thanks!
    I am working with your design(except that RA3=RA4=1M), but I've got much noise from that channel, Do you have an idea why?
    This is the Piezo connected straight to the LINE-IN
    10541
    This...
  25. Replies
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    Hi, I am working on some project, with quiet...

    Hi,

    I am working on some project, with quiet the same principles.
    my pickups are piezo sensors (I don't know their exact impedance but It should be is very high)
    I am working with the teensy...
  26. Anyone worked with the MAX\MSP using the Teensy...

    Anyone worked with the MAX\MSP using the Teensy as Audio interface?
  27. hi tni, Thanks, I just tried what you said, the...

    hi tni,
    Thanks, I just tried what you said, the Teensy now is not the default recording device and still I got red exclamation mark flashing..
    no signal in the meters of the ~adc element.

    while...
  28. Audio adapter stream to USB --> receive in MAX 7 with ASIO4ALL

    Hi,

    Anybody tried to work with ASIO4ALL with the Teensy as Audio card? or specifically with MAX7 and Teensy?
    - I am working with Win10. working with Teensy3.2 and Teensy Audio Board.
    - They...
  29. Is there a Teensy simulator with debugger that I...

    Is there a Teensy simulator with debugger that I can work with?
    Or any idea how can I understand the flow of the program?
  30. Why does the usb_audio_transmit_buffer set to...

    Why does the usb_audio_transmit_buffer set to array size 90 (AUDIO_TX_SIZE/2)?
    I can see that usb_audio_transmit_buffer is uint16_t type, so why every callback you copy there 32bit? (right and left)...
  31. Hi Paul, I am trying to dive into the USB specs...

    Hi Paul,
    I am trying to dive into the USB specs (specifically chapter 5). In the meantime I am trying to understand the logic behind the usb_audio lib.
    Any suggestion where to focus?
    The Idea is...
  32. Hi Paul, It's been a long time since I asked this...

    Hi Paul, It's been a long time since I asked this question - It took me a long time to dive in those things (much work in the university..)

    I see in the object AudioOutputUSB that there are 4...
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    Ohh I will look. Thanks! by the way the...

    Ohh I will look.
    Thanks!

    by the way the USBpassThrough also didnt worked..
  34. Replies
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    I removed all the new wiring. The Teensy 3.2 is...

    I removed all the new wiring. The Teensy 3.2 is now connected to the "Main" audio board, (the one that got 0.1u cap removing. near leg 15)
    I have tried to upload a few examples to test the board....
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    OK thanks. Does it make sense that the audio...

    OK thanks.
    Does it make sense that the audio adapters were blown because not cut those traces?
  36. Replies
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    Hi, I have a question regarding the sparkfun...

    Hi, I have a question regarding the sparkfun guide for the quad channel (input in my case) with Teensy3.2
    https://www.sparkfun.com/news/2055
    what is the meaning of "cut apart"?


    I've done all...
  37. Replies
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    Hi Paul, while streaming the signal from the...

    Hi Paul,
    while streaming the signal from the LINEIN to the LINTOUT on the audio board I hear no latency, probably that's under the 10ms you told,
    While trying to stream the signal to the USB...
  38. Replies
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    @bmillier Thanks again. Yesterday I decided to...

    @bmillier
    Thanks again.
    Yesterday I decided to connect the Piezo sensors straight to the SGTL's LINEIN.and suprisingly It actually works OK but with some constant noise around 3.8KHz.
    so for now,...
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    So there is a way for minimize the latency? I am...

    So there is a way for minimize the latency?
    I am trying to stream to the USB and I got big latency
    my code is very simple, how can i decrease the latency? maybe some changes in the pc buffer?
  40. Replies
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    @bmillier I designed an active filter in the...

    @bmillier
    I designed an active filter in the following way :
    9969

    I chose the PGA2311 because my piezo signals are inconsistent and I need to handle with bigger or smaller signals(depends on...
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    I got it.Sorry if its a stupid question but is...

    I got it.Sorry if its a stupid question but is the 100Khz oscillator wouldn't cause aliasing ? (the SGTL5000 sampling rate)

    My source is a piezo sensor, and it's p-p is around 100mv, it's not...
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    Hi bmiller, I just brought the ICL7660CPAZ, it...

    Hi bmiller,

    I just brought the ICL7660CPAZ, it works ok (I need to check if the ripples wont affect on my signal...
    Anyway I got another problem that I am trying to handle,
    The signal from the...
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    Dear bmiller, thanks for the explanation and the...

    Dear bmiller, thanks for the explanation and the tips.
    I am checking for the ICL7660 and I see that there are variety of types, all are DIP,

    INTERSIL - ICL7660CPAZ - IC, VOLT CONVERTER, 7660,...
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    Thank you all! I see that the package of...

    Thank you all!



    I see that the package of the LM2776 available only in DBV package, Its good for the PCB that I will print later, but in this point i need something to work on the breadboard,...
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    Hi Guys! Thanks a lot. I can upload a picture of...

    Hi Guys! Thanks a lot.
    I can upload a picture of my connections but its on a matrix and its hard to understand the connections..

    So I brought another 5V and connected to the VA- = -5VDC, and now...
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    Hi Paul, Thanks for your help. It seems that I...

    Hi Paul, Thanks for your help.
    It seems that I didnt used the oscilloscope as I should... Now I got clock, and stream of data. So I assume the SPI channel is ok, but not I have another problem, with...
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    i dowloaded the last teensyduino just today... ...

    i dowloaded the last teensyduino just today...

    regarding the code,
    if we leave the pga just for this moment,
    shouldnt i get clock and bits out from 13 and 11?
    11 is stable on about 3.3 v dc...
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    SPI not working - Teensy 3.2

    Hi all,

    I am new with the teensy, I got 3.2, I am trying to control PGA2311 with the SPI channel.
    I followed the SPI lib guide page to make the conections...
  49. Planning the driver for the Teensy Audio Board LINEIN

    Hi, I am trying to plan the driver that I should build for the teensy audio board before feeding it with Piezo electric - high impedance sensor,
    my source is a guitar piezo pickup, the impedance is...
  50. :eek: I looked here...

    :eek: I looked here http://www.pjrc.com/teensy/SGTL5000.pdf
    page 6
    8809


    I am trying to do the same, guitar connected to the audio board! but instead of the magnetic-pickup I am using this...
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