So I designed the schematic, build it on a breadboard and after all works as expected - send it to fabrication.

One week later the PCB's arrived !

Let's assemble the first.

Step 1 - solder Resistors and Condensators

Step 2 - solder pin-headers for the PCM5102A-module

Step 3 - put the PCM5102A-module on the pin-headers  and the pin-sockets for the ESP32-Devkit

Step 4 - solder the antenna-cable and put the ESP32-Devkit on 

Now flash it - via PlatformIO - connect the antenna cable to your receiver, pair it with your smartphone (via BlueTooth), play some music and tune your receiver to the frequency - Voila'