* General Data

  1 in = 1000 mil
  1 in = 2.54 cm
  1 in = 25.4 mm

  1 mm = 39.37007874 mil

  1 mil = 0.0254 mm

  1 mil = 25.6 um

  ----------------

  1 kg = 2.20462262185 lb

  1 oz = 28.349523125 g


  *********************************************************

  copper : 

    density = 8.96 g/cm^3

    1 oz copper (over 1 ft^2)

    [using cm] --> [t * (12 * 2.54)^2] (8.96 g/cm^3) = 1 oz * 28.349523125 g / oz

                   t = 0.00340571 cm

                   t = 0.03406 mm

                   t = 1.341 mil

   

  

  1 oz copper = 1.341 mil
  1 oz copper = 0.0341 mm



  resistivity = 16.78e-9 ohm-m

  conductivity = 5.96e7 [1/(ohm-m)]

  1 oz copper --> 0.492 mOhm/sq

  *********************************************************

Standard PC board traces are typically 
  0.010″ 0.3 Amps
  0.015″ 0.4 Amps
  0.020″ 0.7 Amps
  0.025″ 1.0 Amps
  0.050″ 2.0 Amps
  0.100″ 4.0 Amps
  0.150″ 6.0 Amps


Standard PCB thickness is 0.063 in. (1/16 of an inch)

For a two layer stackup board this might thus be :

  (https://www.7pcb.ca/Upload_file/Multi-layer-stack-up.pdf)

  top = 1 oz copper        --> 0.0014" --> 0.0356 mm
  core = dielectric Er=4.2 --> 0.057" --> 1.448 mm
  bot = 1 oz copper        --> 0.0014" --> 0.0356 mm
                               






* Nice inductance calculation tools

  https://www.eeweb.com/tools/wire-inductance


* Nice microstrip calculator
  http://www.multek.se/index.php?page=microstrip-impedance-2


* Nice PCB trace calculator
  https://www.4pcb.com/trace-width-calculator.html