Plasma Table Arduino THC: Board Overview

Upshot: A thorough look at the PCB for my Arduino based torch height controller, for my LinuxCNC plasma table build.

Topic index:
00:00 - Intro
02:54 - Tips on designing, building & KiCAD
06:52 - How a THC works, my Hypertherm, voltage dividers & adjusting for your plasma
12:30 - RC lowpass filter, Thevenin's theorem & picking a capacitor
21:05 - Other components (linear regulators, power supplies, and optocouplers)
30:12 - A couple notes on not breaking your stuff/electrocuting yourself
32:17 - Potential improvements, other quirks, stuff that didn't work, stuff you could change
44:24 - Digging into the wiring/schematic, LM317, PC817
66:33 - Looking at the PCB layout & finale

Here's a permalink where you'll find the schematics shown later in the video. Note that updated versions may be available if you check the latest version of the repository.
https://github.com/swolebro/swolebro-...

The latest version of the repo, with extra LinuxCNC stuff and more:
https://github.com/swolebro/swolebro-...

Here's the full plasma build series:
   • CNC Plasma Build (Full)  

Just Arduino stuff:
   • Arduino  

Your donations help me make more cool shit:
http://paypal.me/swolebroshopworks


Other YouTube channels:
Contextual Electronics:    / contextualelectronic  
CE's Getting to Blinky 5.0:    • Getting To Blinky 5.0 - Introduction  
EEVblog:    / eevblog  
All About Electronics:    / @allaboutelectronics  

Some wiki links (blame YouTube for automatically inserting the awful URL redirects)
https://en.wikipedia.org/wiki/Ohm%27s...
https://en.wikipedia.org/wiki/Resistor
https://en.wikipedia.org/wiki/Voltage...
https://en.wikipedia.org/wiki/Low_pas...
https://en.wikipedia.org/wiki/RC_circuit
https://en.wikipedia.org/wiki/RC_time...
https://en.wikipedia.org/wiki/Cutoff_...
https://en.wikipedia.org/wiki/Th%C3%A...
https://en.wikipedia.org/wiki/Network...)
https://en.wikipedia.org/wiki/Linear_...
https://en.wikipedia.org/wiki/Opto-is...
https://en.wikipedia.org/wiki/Operati...
https://en.wikipedia.org/wiki/Operati...)
https://en.wikipedia.org/wiki/LM317

A RC lowpass filter calculator:
http://sim.okawa-denshi.jp/en/CRtool.php