Hi,
I'm back with one of my last project based on Hifiberry product :
https://drive.google.com/open?id=15zUUjro6BIbIL4OiECDeJA8X9f5EvLq6
This config. is powered by PI3 & AMP2. I use Picoreplayer with extra : The rotary encoder manage volume & play / pause. Power switch is linked to 18V power supply (from Hifiberry shop).
Clean & soft result but powerfull and clear sound !