Acoustic Sensor Circuit Design

flux

Yes — based on the files you shared, your design does look like a 3.3 V analog acoustic front-end feeding an ADC, and the PCB file currently shows:
What I confirmed from your PCB

Table

SettingCurrent value seen
Board outline100 mm x 100 mm
Trace width in routed segments0.25 mm
Copper zone clearance on main copper zone0.5 mm
So if you want to keep the board size exactly 100 mm x 100 mm, that is fine. You only need to make sure the design rules match your competition/manufacturing target.
How to set minimum trace width and clearance in KiCad
These settings are in the Board Setup window.
1) Open the PCB editor
  • Open your project in KiCad
  • Open the PCB Editor
2) Open Board Setup
  • Go to File -> Board Setup
  • In the left panel, open Design Rules
  • Then check these sections:
    • Constraints
    • Net Classes
3) Set the global minimum clearance
In Design Rules -> Constraints:
  • Find Minimum clearance
  • Set it to 0.25 mm
4) Set the minimum track width
In Design Rules -> Constraints:
  • Find Minimum track width
  • Set it to 0.25 mm
5) Set the default routing width
Still in Board Setup, go to Design Rules -> Net Classes
  • In the Default net class:
    • Set Track width to 0.25 mm
    • Set Clearance to 0.25 mm
  • If you use custom net classes, set those too
6) Save
  • Click OK
How to set copper zone clearance in KiCad
This is separate from normal track clearance.
If the zone already exists
  • In the PCB editor, click the copper zone outline or filled area
  • Press E to edit it, or right-click -> Properties
  • In the zone properties window:
    • Find Pad connections / Clearance or Clearance
    • Set it to 0.25 mm
  • Click OK
  • Refill zones by pressing B
If the zone inherits rules
Some KiCad versions let the zone use the net-class or board rule.
  • If there is an inheritance option, make sure it resolves to 0.25 mm
  • If you want zero ambiguity, set the zone clearance explicitly to 0.25 mm
What to check after changing it
After updating the rules:
Run DRC
  • In the PCB editor, click Inspect -> Design Rules Checker
  • Run the check
  • Look for:
    • clearance violations
    • unconnected items
    • silk over pads
    • edge clearance issues
Refill zones
  • Press B
  • Then run DRC again
Important note for your current board
From your file:
  • Trace width already appears to be 0.25 mm
  • The main copper zone appears to be 0.5 mm clearance
That means you likely only need to:
  1. keep board size as-is
  2. verify Board Setup minimums are 0.25 mm
  3. edit the copper zone so its clearance is also 0.25 mm
  4. refill zones
  5. rerun DRC
Recommended final values

Table

RuleSet to
Minimum track width0.25 mm
Minimum clearance0.25 mm
Default net class track width0.25 mm
Default net class clearance0.25 mm
Copper zone clearance0.25 mm
For JLCPCB acceptance
A 100 mm x 100 mm board is usually okay if that exact size is intentional. I would not change it if your competition requires it. Just make sure:
  • Edge.Cuts is one closed outline
  • DRC is clean
  • zones are refilled
  • Gerbers look correct in a viewer before upload
If you want, I can next give you:
  • a click-by-click KiCad checklist, or
  • a JLCPCB pre-upload checklist for Gerber export.
KiCad click checklist
JLCPCB upload checklist
Inspect uploaded schematic
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