I'm thoroughly confused by the note in the Analog Discovery 2 Reference manual, Section "2. Scope" about having a common ground reference. I understand (at least I think I do) about the dangers of floating ground but I'm not sure how to fix it.
My setup at present is a breadboard with power supplied by a linear DC power supply usually set to 9v (I got tired of replacing 9 volt batteries). The power supply has - terminal, + terminal, and Earth Gnd terminal. Presently I'm powering my board with the + and - terminals, treating the - terminal as ground.
The Analog Discovery 2 (AD2) is being powered by a usb port on a laptop. Since the power to the laptop is being supplied by an AC/DC brick, I have no idea what the ground is on the AD2.
Is it simply a matter of taking a ground wire on the 2x15 fly wire and plugging it to the - terminal via the breadboard? Should I take the - terminal on the power supply and short it to the earth ground? Or should I be looking at the solution mentioned in the note above:
Question
Jeromed
I'm thoroughly confused by the note in the Analog Discovery 2 Reference manual, Section "2. Scope" about having a common ground reference. I understand (at least I think I do) about the dangers of floating ground but I'm not sure how to fix it.
My setup at present is a breadboard with power supplied by a linear DC power supply usually set to 9v (I got tired of replacing 9 volt batteries). The power supply has - terminal, + terminal, and Earth Gnd terminal. Presently I'm powering my board with the + and - terminals, treating the - terminal as ground.
The Analog Discovery 2 (AD2) is being powered by a usb port on a laptop. Since the power to the laptop is being supplied by an AC/DC brick, I have no idea what the ground is on the AD2.
Is it simply a matter of taking a ground wire on the 2x15 fly wire and plugging it to the - terminal via the breadboard? Should I take the - terminal on the power supply and short it to the earth ground? Or should I be looking at the solution mentioned in the note above:
Universal Serial Bus (USB) Peripheral Isolator Circuit
http://www.analog.com/en/design-center/reference-designs/hardware-reference-design/circuits-from-the-lab/cn0160.html#rd-overview
Thanks in advance for your help.
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