AddOhms by Bald Engineer

My new laser cutter didn’t seem to work. I tried all of the usual troubleshooting steps. Then, I got the idea to use a special kind of tool. Behind the scenes All of the sound effects you hear are ones that I added: “in post.” The footsteps, the laser cutter, and (obviously) the lightsaber were all recorded separately. I used the Adobe After Effects plugin Saber from Video Copilots to do the glow. If you watch carefully, you’ll see that it even reflects off my glasses and laser cutter!

Here are 8 questions you’ve sent in. Rare (at least, up until now) video of James talking unscripted. Questions answered in this video: Why does AC change direction? 2. What do home appliances run on? 3. Is Analog or Digital More Accurate? 4. When do you use Pull-down resistors? 5. Difference between LM7805 and LM7812? 6. What diode to pick for a motor’s flyback diode? 7. Does James draw his own Animations? 8. What does “AddOhms” mean?

This Addohms Brushed DC Motor Tutorial goes into the third dimension! Using a variety of 3D models, we show you what makes a brushed DC motor, a brushed DC motor. Then, like usual, we break two simple ways to control them with a microcontroller like the Arduino. You can use a single BJT Transistor (remember those from #10?), build your own H-Bridge, or use a popular H-Bridge chip.

Video Do electrons flow from positive to negative? Or do they flow from negative to positive? This AddOhms tutorial looks at the difference between Conventional Flow and Electron Flow. James also addresses whether or not his drawings are incorrect. Current Flow Direction Show Notes Ben Franklin by Duplessis 20 [via wikicommons]

Video Switching regulators make use of the energy storage properties of capacitors and inductors. A transistor, or switch, controls the charging and discharging. This method makes for an efficient regulator but can be difficult to design. Show Notes Here are links to the products mentioned in AddOhms #18: