Ohm’s Law – Resistors for Fan Speed Part 4 - PCB Design

[the offset voltage]

Hi,

following https://www.eevblog.com/forum/beginners/ohms-law-resistors-for-fan-speed/ and https://www.eevblog.com/forum/beginners/ohms-law-resistors-for-fan-speed-part-2/ and https://www.eevblog.com/forum/beginners/ohms-law-resistors-for-fan-speed-part-3-pcb-design/ i have finished my first PCB, and i kindly ask for your review.


I am using the layer stack manager values from Fig.1 (this values are used on my PCB design course).

For the Rules i use (this values are also used on my course):
Rules:
   - Clearance: minimum clearance: 0.3mm.
   - Width: preferred: 0.5mm; min: 0.3; max: 1mm; (i have used 0.5mm trace width).
   - Routing via style: via diameter 0.6mm; via hole size 0.3mm. (no need to use any via).

Thank you,

[thm_w]

Normally I would suggest to use a ground plane and thicker traces.
In this case since you are using small currents (<100mA) it won't really matter and should work ok.

Mount holes just be aware the head of the screw is probably wider than you've drawn the copper pad, unsure what screw size you are using.