Tee Shirts here (USA & Canada): https://teespring.com/focus_us Rest of the World here: https://teespring.com/focus_eu In this vid; a speed controller for tools. We have a look at how it works, the components and we'll use an oscilloscope to see the dirty, dirty power it's providing to your tools. Long term projects here: http://www.Patreon.com/AvE