After I posted my replay, I read Jerry's recommendations.? I like the second receiver test for the BFO to verify that the Raduino RF section is working.? I will need to remember that for future references.? You can do that when powered by the USB connection as the Si5351a runs off of the 3.3v rail that comes from the Nano.
Another possibility for the source of the smell is it came from the volume control.? If you truly put 12v across it, and the wiper was close to one of the ends, you could have smoked it.? Since the resistor is behind a metal case, you may not see it without close inspection.? Run a resistance check on it as well.
73
Evan
AC9TU
