Static noise when teensy is connected to a mixer

T

tejas

Active member
Hello,

I have a teensy 4.1 whose stereo line out is connected to a mixer, which is connected to (and powered by) a laptop (running on battery) via USB. The teensy is also connected to the same laptop via USB to monitor serial messages. Headphones are connected to the mixer.

I hear a constant static noise (sounds like USB noise) from the headphones. I tried changing cables, used a different mixer, but the noise remains. The only time the noise goes away is if the teensy is powered by a different source, such as a 5V battery. However, I need to monitor its serial, so it has to be on the same laptop.

Is there a way I can get rid of the noise?

Thanks,
Tejas
 
Heavy filtering? USB is notoriously noisy and its probably wise to only use USB cables with big ferrites at each end. It may also just be noise from the 5V power over USB which comes from the laptop - a powered hub might be worth trying.

Another thought is you have 2 separate connections to the laptop which risks creating a big loop-antenna - can the cables be run together to reduce ground-loop area?
 
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