Raspberry Pi zero/3B/4B speaker expansion board GPIO audio amplification PWM sound card

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Software

sudo nano /boot/config.txt
add to

dtoverlay=audremap,pins_18_19

save & Exit restart
sudo raspi-config

Select Audio -> 'headphone'

Connection Examples

Working With Raspberry Pi ZERO 2

Working With Raspberry Pi 4B

External 8Ω 5W Speaker output mode

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Raspberry Pi Audio Module (B) User Guide

Software

Connection Examples

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Raspberry Pi GPIO audio amplification PWM sound card speaker expansion board