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RASPIAUDIO AUDIO+ at Raspberry Pi GPIO Pinout
https://pinout.xyz/pinout/raspiaudio_audio
RaspiAudio enables your Raspberry Pi ( Pi 3, 2, B+, A+, and Zero) with a state of the art audio DAC. Great for home audio sound systems, an internet radio, or any project with audio. Features. DAC I2s 24-bit 96KHz audio with studio sampling quality. Included dual RCA phono connector line out stereo (soldering required) Line out stereo jack 3.5mm.
raspbian - How to output audio signals through GPIO ...
https://raspberrypi.stackexchange.com/questions/49600/how-to-output-audio-signals-through-gpio
On recent Pis the audio jack output is provided by PWM channels 0 and 1. PWM channel 0 is fed to GPIO40 which is connected to the (stereo) right channel, and PWM channel 1 is fed to GPIO45 which is connected to the (stereo) left channel. These PWM channels may additionally be fed to user accessible GPIO.
Raspberry Pi 3 Audio In/Out through GPIO - Raspberry Pi Forums
https://forums.raspberrypi.com/viewtopic.php?t=171165
Re: Raspberry Pi 3 Audio In/Out through GPIO Thu Jan 12, 2017 10:37 am I don't exactly how it will effect but I did this experiment on my Raspberry Pi 2 Model B and looking forward to do same on my Raspberry Pi 3.
Audio Outputs | Introducing the Raspberry Pi Zero ...
https://learn.adafruit.com/introducing-the-raspberry-pi-zero/audio-outputs
GPIO #18 is also known as PWM0 and in the original Pi was coupled with a very basic RC filter to create the audio output: If you don't mind getting a few 150 and 270 ohm resistors, and two each of about 33nF (also known as 0.033uF) and 10uF capacitors, you can basically recreate those two filters. Now all you need is access to PWM0_OUT and PWM1_OUT, …
Adding Basic Audio Ouput to Raspberry Pi Zero
https://cdn-learn.adafruit.com/downloads/pdf/adding-basic-audio-ouput-to-raspberry-pi-zero.pdf
The first uses a DTO that was recently added it seems: 1. There is a much simpler way to configure the Pi GPIO pins for PWM audio. Simply adding the following line to your /boot/config.txt will reconfigure the pins at boot without any external software or services: dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4.
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