Raspberry Pi only comes with a jack output
In my audio projects, I'm always looking for better quality
Here, I share with you what I found
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Cheap USB Microphone
For your first audio projects on Raspberry Pi it can be enough.
Upgrade to the other one as soon as it becomes serious
Amazon.com
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USB Audio Adapter
Another way to manage audio is to get this USB adapter.
Just plug your current jack speaker/microphone
Amazon.com
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Conference Microphone
For projects like Alexa it's better to take a conference microphone.
As Jabra models are overpriced, this one from Amazon is perfect
Amazon.com
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Professional DAC
For professional audio projects, this hat can greatly
improve the sound quality of your Pi
Amazon.com

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I recommend these products because I use them myself and I know them.
This is simply a list of what I use and love