Hi Maniac, realy impressed by your box
I can say too, I have a very stable behaviour, since more than one month now, on the NanoPI side or the Hecate side.
One thing puzzled me on your pictures. How do you manage the different grounds ? If I see well the copper case seems to link all connectors ground?
Along my experience, with these setup we have to manage at least 3 or 4 different PSU:
- the SBC (RPI in your case) PSU => 5V
- the Hecate's input PSU through USB (which is the same as the SBC PSU in my own case in NanoPat) => 5V
- the Hecate's output PSU for the Xilink processor and the I2S+SPDIF outputs. This one is self powered (may be a weak point?) and isolated from the Hecate's input PSU.
- the I2S/HDMI LVDS output mudule's PSU => 3.3V
I took care to not ground them all together. Especially the input and output of the Hecate board are isolated, so I think it make sense to let things as they are. The HDMI module will be inevitably grounded with the Hecate Output, so we have no choice to link the 3,3V PSU ground with the internal output PSU ground of the Hecate. For that I choosed, a bit arbitrarly I must admit, to ground my metal box only to the HDMI output module PSU ground.
How do you manage your grounds and do you think that grounding all together does not harm anything ?