#21 Brushless (BLDC) Motors
<a href="http://addohms.com/brushless-dc-motors">Brushless Motors</a> have no commutation ring and no brushes. Here is how they work and the circuit you would use to control one. (Although, I say, use an ESC.)
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#15 Pull-Up Resistors
AddOhms Episode #15: Pull-Up Resistors
When questions can't easily be answered in the YouTube comment system, I'll post them here. Feel free to participate in any of the questions, but please do not create new topics.
#4 Basic Terms
#6 Digital and Analog
#7 Arduino vs Raspberry Pi
#8 Current Limit Resistors
#12 Rasp Pi B+
#13 Voltage Dividers
One Correction: I point out that there are 6 instruments, but seemingly only show 5. When I refer to the Oscilloscope as a "Mixed Signal Oscilloscope" I meant to call that 1) an oscilloscope and 2) a logic analyzer. That's how I got to 6!
#17 Linear Regulators
#19 Current Flow Director
#20 Brushed DC Motors
Learn what makes a brushed DC motor, a brushed DC motor. You will also learn how to control them with an Arduino, 2n3904, and an h bridge. Understand how an H Bridge lets a brushed DC motor spin in two directions, without a negative voltage.