Raspberry Pi uses its HDMI port as a default port for audio output. This article explains changing audio port on Raspberry Pi to 3.5” mini jack in a couple of simple steps.
Changing audio port
We will use the amixer command that lets you manage sound card settings.
sudo amixer cset numid=3 1
Line above sets third sound card element to 1 and activates the mini audio-jack port.
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