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Thread: Crosstalk / noise on audio

  1. #1

    Crosstalk / noise on audio

    I am using the Teensy Audio Adapter for both inputs and outputs on a test fixture.

    The Teensy 3.2 is also switching an array of LEDs (bar graph display) powered by the 3.3V output on the Teensy 3.2

    This seems to be adding clicks and noise to the audio out.

    How much PSRR does the audio have?

    Would it be better to buffer the LEDs and power them from the raw supply (5V)?

  2. #2
    Senior Member
    Join Date
    Jul 2020
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    390
    Quote Originally Posted by bdoan View Post
    I am using the Teensy Audio Adapter for both inputs and outputs on a test fixture.

    The Teensy 3.2 is also switching an array of LEDs (bar graph display) powered by the 3.3V output on the Teensy 3.2

    This seems to be adding clicks and noise to the audio out.

    How much PSRR does the audio have?
    The datasheet will say, but not enough with heavy currents being switched on the same supply - separate supply is
    really going to help, as may some more decoupling, and attention to current paths to avoid sharing wires between
    audio and LED loads.

    Would it be better to buffer the LEDs and power them from the raw supply (5V)?
    Its quite likely to help, but watch out for ground routing, star-grounding is advised.

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