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Thread: No sound at the headphone output with audio board.

  1. #1
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    No sound at the headphone output with audio board.

    Hello,

    I have searched and tried a lot but I have a problem with the audio board and Teensy 4.1.
    There is no sound at the headphone output.
    Which pins must at least be connected for this? And do you have to make changes to the library for the version with Teensy 4.1?
    Many thanks for your help.

  2. #2
    Senior Member
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    Are you using the Rev D audio board?
    Post a photo which clearly shows the audio board and T4.1 connected together.
    The audio library works with T4.1

    Pete

  3. #3
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    Yes, I have the Rev D.
    I tested it with the examples from the library. And Frank Boesing's mp3 player.
    I can only take pictures on Friday because I'm on the road for work.

  4. #4
    Senior Member+ Frank B's Avatar
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    Some general rules:
    Don't use a low quality breadboard, no low quality china cables. If cables, they should be a short as possible (really).
    Minimum - for audio - pins are 7, 8, 18, 19, 20, 21, 23, GND, 3V3 - and look here: https://www.pjrc.com/store/teensy3_audio.html

  5. #5
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    Thanks for the tips. I soldered the audio board with 2 cm short wires directly over the Teensy.
    I connected pins 7, 8, 18, 19, 20, 21, 23, GND, 3V3. According to the description of PJRC. But unfortunately there is no sound.

  6. #6
    Senior Member PaulStoffregen's Avatar
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    Did you solder GND which is next to pin 0, or GND which is between VIN and 3.3V?

    The one next to pin 0 (on the audio shield) must be connected. It will not work if you used a wire only on the other GND.

  7. #7
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    I solder both GND Pins ;-)

  8. #8
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    Tomorrow I'll get another audio board and another Teensy. Maybe I damaged something while soldering.

  9. #9
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    I found the mistake. The connection had a pin offset at 7 and 8. Now it works.
    Thank you very much. Especially to Paul and Frank.
    That was a "stupid mistake". I looked for the fault for three days. Shame on me...

  10. #10
    Senior Member+ Frank B's Avatar
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    happens
    Been there..

    Glad that it works now

  11. #11
    Senior Member PaulStoffregen's Avatar
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    Oh, I know that mistake well too!

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