Digital noise on TPA3116 - I2S DAC - Raspberry Pi combo

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Twerp

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Joined 2013
This is most likely a schoolboy error.

I've rigged up a little audio device that uses a Raspberry Pi and I2S DAC to feed into a TPA3116, but I'm getting awful digital noise through the amp output whenever the Raspberry Pi blinks an LED! The 19.5v supply is from a laptop switching PSU.

However, if I power the Pi/DAC with a battery power pack, everything sounds fine.

Have I wired this up wrong, or is the KIS-3R33S step-down board defective.


An externally hosted image should be here but it was not working when we last tested it.


Thanks in advance!
 
T

Twerp

Member
Joined 2013
dogshome said:
How about grounding the 0V of the PSU?

Currently, there is no ground.

Also check what gains you have. How much signal gives full output and is it simply a case of reducing the gain on the amp by turning it's pot down?
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What can I ground it to?

I'm using a digital volume control in the pi software. So the gain is 26db i think.

Thanks!

Sent from my X5pro using Tapatalk
 
T

Twerp

Member
Joined 2013
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