Hello wertkost,
I am considering buying the HiFiBerry DAC+ Pro and had done a little homework. There are two potential problems with using this DAC card:
1. When using the HiFiBerry DAC+ Pro with a Raspberry 3B there is a UART conflict with the built in bluetooth. You need to add the following line to config.txt to disable on-board bluetooth:
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dtoverlay=pi3-disable-bt-overlay
It is also possible that you will need to stop hciattach trying to reach the modem via uart0. This can be done in by blacklisting the bluetooth drivers as described in this post:
disable-wifi-and-blueooth-on-pi3-t3547.html#p14220 OR (I have not tried this) via the SSH interface disable starting the services with the command:
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systemctl disable hciuart
2. On the HiFiBerry website, hidden away in their documentation, you can find the text:
The DAC+ Pro onboard oscillators can interfere with onboard WLAN. Selecting a different WiFi channel usually fixes this problem.
You could try changing the WiFi frequency. But this statement points to a more general problem: WiFi (and Bluetooth) antennas & DAC oscillators don’t like to be close together. You should therefore consider switching off the built in WiFi. But if you really determined to use WiFi, you could use a dongle on a short USB cable to keep it away from the oscillators. You can switch off built in WiFi by blacklisting the WiFi drivers see this post:
wifi-disable-rpi3-t4390.html#p19743Regardless of the above you should read this post: disable-wifi-and-blueooth-on-pi3-t3547.html#p14220I am very interested in your progress, please post updates.
Janui