Hierarchical label and GND appearing as +3.3V

[Wei_Cong]

Hi, I am new to Kicad here and am following an online tutorial.

I have following the tutorial step by step but found 2 issues when trying to go from layout editor to PCB editor:

1. For C18 that is linked to 3.3V and GND, it seems like it is still being detected as +3.3V on both pads on the PCB footprint

2. It seems like the hierarchical label for MIC_OUT is not being detected as a net and remains as Net-(U6-IN-)

[paulvdh]

Big fat short directly between pins 2 and 4 of U6.

[Wei_Cong]

Thanks, it was a mistake and had updated it

but it seems like C20 and R31 now has 1 pad as MIC_OUT and 1 pad as Net-(U6-IN-)

[paulvdh]

@Wei_Cong

but it seems like C20 and R31 now has 1 pad as MIC_OUT and 1 pad as Net-(U6-IN-)

Yes, what’s the problem with that?

[DaveL]

@Wei_Cong

but it seems like C20 and R31 now has 1 pad as MIC_OUT and 1 pad as Net-(U6-IN-)

One side of C20/R31 has a net name Net-(U6-IN-) because you didn’t otherwise assign a net name to that node, so Kicad made it’s own net name assignment. The other side of C20/R31 has a net name MIC_OUT because you did otherwise assign a net name to that node.

[nickmBY]

A brief comparison between your schematic and the data sheet’s “Typical Operating Circuit” on page one shows that you got it quite wrong.
The voltage divider R26 / R28 (R_bias) with the parallel R27 makes no sense.
R30 and C19 (C_in and R_in ???) are connected wrong.

But maybe that is just part of the tutorial: Fix your schematic, read the data sheet.

Edit: There’s a better schematic on page 8/fig 2