PCB Track Width

[Munro306]

Designing my first 2 layer PCB in KiCad which will be manufactured via JLCPCB and looking for guidance on track width.
Is there a rule of thumb people use for selecting track widths? Either for power tracks or signal tracks.
I was able to find this 2015 writeup from MadBean stating:

Power traces are thicker (24mil) whereas audio traces are thin (10mil)

Is this still considered convention?

Also, how do I identify which connections (or nets) are power and which are signal?

Below is my schematic, I assume the tracks for the signal connections (10 mil) are for connections on the half part of the schematic, and power tracks (24 mil) are for the connections on the lower half of the page.

 

[Brett]

Is this still considered convention?

Generally speaking, it's good practice to make sure that power traces have as little resistance as possible, hence larger traces. Lower resistance means lower heat and a happier PCB. Ground is considered a power trace and should consume as much copper area as possible to ensure the return path is as close to zero resistance as possible. Ground path is typically done with copper pours on the front, back, or both (in cases of double sided boards).

Also, how do I identify which connections (or nets) are power and which are signal?

Everything around the power section (bottom of schematic) and any direct connections to the power section (VREF flags) are power lines.

 

[Brett]

I have not combed through your schematic, but I did just notice that you appear to be missing a junction at the negative pin of C100 and the net connecting H4:


It could be a visual thing, but if the junction is missed, your circuit will not work.

 

[Nostradoomus]

R102 should be 10k, you have your 833 set up reversed too (swap pins 2 and 3, the other half of the opamp is good tied off where it is) that’s about all I noticed

 

[Munro306]

Oh wow, thanks so much to both of you! You are absolutely right with those corrections! Thanks a million

 

[jimilee]

Oh wow, thanks so much to both of you! You are absolutely right with those corrections! Thanks a million

I like to lay mine out and check it over real good, come back to it in about 24 hours and fix the mistakes I completely missed.

 

[finebyfine]

I use diptrace but only use the track width conventions liberally. I use 10mil for signal and will usually use 15-20mil for power but I’m never afraid to knock those down to 10mil if it makes it easier to route or if it makes for better ground pours.