Are there any analog to digital DIY projects?

Are there any DIY analog to digital projects, boards or kits out there? I would love to get something like the Mytek Brooklyn ADC (Not DAC) but it's discontinued. That leaves me with searching for a used one or seeing if there is a project for one.
 
Yes, another (simpler) possibility could be PCM1803. I guess SCKI needs to be supplied from an external crystal oscillator.

https://github.com/sparkfun/AD_Stereo_Converter-PCM1803A

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