I tried wrapping the jack cable in tinfoil but it didn't help.Putting a USB extension lead between Pi and USB-DAC might help; put some distance between the Pi and the audio signals.
Using ferrites, 'wrapping everything in tin foil', may help prevent any induced noise.
If you can borrow a scope that might reveal what type of noise is bing picked-up by the audio, point to where it's coming from. I recall some poor quality HDMI leads may block Wi-Fi. Is there anything else connected to your Pi ?
PS : That mirroring of the Pi initially had me confused but I figured it out !
And no there's nothing else connected to the pi.
Also the noise is still present when using the onboard 3.5mm jack.
I'll try using an extension lead.
I dont think the noise is coming from the LM2596 because the noise is dependant on the PI's CPU. Its like i can hear every instuction being executed.Doing a quick search with 'Buck converter LM2596 noise' gave...
"AI Overview
A major concern with the LM2596 buck converter is its potential for generating significant switching noise due to its design as a simple switching regulator, which can manifest as voltage ripple on the output and conducted EMI across the power lines if not properly filtered and managed in the circuit design; this noise can be particularly noticeable at high switching frequencies. "
Statistics: Posted by wemid65033 — Sat Feb 22, 2025 2:29 am
