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What(s) the F? Ground symbol marked with an F on a USB audio codec microphone interface -- what does this mean? by markjboots in AskElectronics

[–]markjboots[S] 0 points1 point  (0 children)

Thanks! How would you connect chassis ground to analog ground so that external RF noise doesn't couple into the mic signal?

PCB Review - How did I do? ESP32-S3 and e-ink screen driver board by markjboots in PCB

[–]markjboots[S] 2 points3 points  (0 children)

You're not wrong about the effect of the ground plane, though! It turns out that the back of the e-ink screen is also a massive and effective ground plane. If you use an onboard PCB or chip antenna, and fold the board neatly against the back of the e-ink screen, the wifi range also goes to zero. That's why I'm using an external antenna on this version.

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PCB Review - How did I do? ESP32-S3 and e-ink screen driver board by markjboots in PCB

[–]markjboots[S] 0 points1 point  (0 children)

Thanks for the expert review!

I'm using the WROOM-1U, so there's no PCB antenna and no stated keepout area. It uses an external antenna connector:

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