"Hello  rolf
very nice job,
I am waiting for my Tanaris radio. I am wondering why it is not possible to directly link the SBUS to the APM2.5 with a software modification ? There are a lot of serial ports available on APM ?

Regards
Vincent"

"You forgot the fact that the buffer just above the regulator is wrongly wired and can provoque some issues like short circuit on 3v3 ! And could be revealed by intensive use of log in flash memory.

Vincent"

"You are focused on 5V on the rail but what about short circuit on 3v3 comming from a failure of the buffer used the wrong way ! (this was the case on my board)
In this case the result is the same, no more infos from imu, baro...
So we need the proof…"

"Nice to put a full report. But before making a report, sending mail to customers to warn them about the risks would have been better.
In such a case 3DR should ask customers to send back there boards and not fly with it.
This issue seems to be known…"

"Hello,
I have the same probleme and same conclusion, I have removed the buffer because you can't change only the +3v3 and +5V because this component must have B lower than A it can't be reversed.
here is an extract of datasheet : 1.2 V to 3.6 V on A…"