Search:

What is powering the Teensy and audio shield? And when you listen to the line out signal, what equipment is used and how is it powered?



Unintended noise on the line out but not headphone...

344 Hz noise is almost certainly a "ground loop" problem.

When running the audio library, the Teensy CPU does quite a lot more work (draws more current) 344 times per second.

This is exactly the reason why I'm wanting to get Whollender's board with I2S isolation. Testing with isolated I2S signals could really help narrow down whether these types of noise issues are...

Whatever's happening, I'm pretty sure it's not a memory fault due to a 16 or 32 bit access across the 1FFFFFFF to 2000000 barrier. Such a fault would cause all audio updates to stop, because the...

Ground loops are tricky, but usually the problem is ground currents related to non-audio signals flow through the audio ground wire. Being wire, it has small resistance and inductance, causing tiny...

Maybe someday we'll be able to build Whollender's 24 bit audio board, with the isolation parts...

Usually these types of problems are due to ground loops. Without knowing what you're connecting to listen to the signal, and more specifically, how it's grounded, it's difficult to say what to try....