Basic Electronics Tutorials Links

Basic Electronics Tutorials Links
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Many yonks ago I studied school level electrical theory, but since then haven't done much more electrical than wire the odd domestic plug or socket!
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I would like to recap relevant theory and learn lots more to hopefully develop sufficient knowledge, understanding, and confidence to build the electronics for a DIY CNC (with the help of this forum naturally) and maybe then do more using Arduino or Raspberry Pi ideas.
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As with most things on the web, one needs to hunt down the better stuff, so am opening this thread to hold any links to Basic Electronics Tutorials that anyone has found to be helpful.
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As a start I'm finding this series of 63 practical lessons helpful and each of the actual videos in these lessons is less than 10 minutes long:
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http://fearofphysics.com/Electronics/
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Lesson 1: Introduction to the "voltmeter" ~
Lesson 2: How to decode the colour bands on a resistor ~
Lesson 3: Tour of the electrical components used in this video series ~
Lesson 4: Measuring the voltage of various batteries. ~
Lesson 5: Why are there two leads on a voltmeter? ~
Lesson 6: Doing some basic resistance measurements ~
Lesson 7: Resistance of opened and closed switches. ~
Lesson 8: Resistance of a relay. ~
Lesson 9: Measuring the resistance of distilled water, tap water, and dirt (yes dirt). ~
Lesson 10: Introduction to the electrical breadboard. ~
Lesson 11: Investigating a breadboard by "ohm-ing out" the various hole patterns. ~
Lesson 12: The analogy between voltage current and resistance with a water pump water and pipes ~
Lesson 13: The difference between voltage vs. current measurements with a water pump analogy ~
Lesson 14: The difference between voltage and current measurements emphasized with electrical schematics. ~
Lesson 15: Battery resistor and LED circuit with a switch ~
Lesson 16: CdS photo-resistors and the potentiometer in LED circuits. ~
Lesson 17: Basic electronic schematics ~
Lesson 18: Current measurements with 3 different resistors and an LED. ~
Lesson 19: Doing some measurements with Ohm's Law in mind. ~
Lesson 20: Considering Ohm's Law where the voltage changes ~
Lesson 21: Considering Ohm's Law with a photocell (photo-resistor) and thermistor ~
Lesson 22: Considering Ohm's law with a flashing LED. ~
Lesson 23: Measuring voltages across an LEDs ~
Lesson 24: Using a reed relay as a magnetically controlled switch ~
Lesson 25: Voltage drop across a diode and different coloured LEDs. ~
Lesson 26: A mini-lecture on the voltage divider. ~
Lesson 27: Examining current flow in a voltage divider ~
Lesson 28: Current flow into and out of a lightbulb ~
Lesson 29: How voltage dividers work: looking at the current flow. ~
Lesson 30: Building a voltage divider with two resistors then a resistor and a photocell ~
Lesson 31: Using a thermistor and potentiometer in a voltage divider. ~
Lesson 32: Introduction to the Arduino and its ability to read voltages. ~
Lesson 33: Using a photocell in a voltage divider and measuring it with an Arduino. ~
Lesson 34: Using the Arduino as a voltmeter and analog to digital conversion ~
Lesson 35: Arduino software to read a voltage (have the Arduino act like a voltmeter). ~
Lesson 36: Proposal to use an Arduino to measure the earth's gravity ~
Lesson 37: The Arduino-based pendulum to measure the earth's gravity. ~
Lesson 38: Analysing the Arduino pendulum data to measure the earth's gravity ~
Lesson 39: Software for an Arduino that allows for the determination of the earth's gravity using a potentiometer-based pendulum. ~
Lesson 40: Flashing an LED with an Arduino ~
Lesson 41: Build an Arduino-based heat or fire alarm ~
Lesson 42: An introduction to the NPN transistor ~
Lesson 43: Using the brightness of an LED as a current indicator ~
Lesson 44: Build a simple NPN transistor circuit with LEDs as the visual elements ~
Lesson 45: Using LEDs to show how a transistor amplifies current ~
Lesson 46: Use an NPN transistor to turn on a lightbulb motor and buzzer ~
Lesson 47: A transistor circuit that can turn on a buzzer light bulb or motor in response to changing light conditions. ~
Lesson 48: Why one might use a transistor with an Arduino ~
Lesson 49: Turning on a transistor with an Arduino digital output line ~
Lesson 50: Building an automatic night light with an Arduino and transistor ~
Lesson 51: The use of base and collector resistors with an NPN transistor ~
Lesson 52: Mini-lecture on an introduction to capacitors ~
Lesson 53: Demonstrating how capacitors store electric charge or electric energy ~
Lesson 54: Demonstrating how a resistor and capacitor (RC) circuit gives timing in electronics ~
Lesson 55: The speed at which a voltage appears on a voltage divider vs. resistor/capacitor (RC) circuit ~
Lesson 56: Watching voltage fall in a resistor/capacitor (RC) circuit ~
Lesson 57: The charge equation for a capacitor Q=CV and using this with a resistor/capacitor (RC) circuit ~
Lesson 58: Using resistor/capacitor (RC) circuits and a transistor to turn on an LED ~
Lesson 59: The "hello world" of electronics: flashing an LED ~
Lesson 60: Introduction to a relay as the core element in building an LED flasher ~
Lesson 61: Proposing how we'll build a relay that can automatically discharge a capacitor ~
Lesson 62: How to build the relay that turns on and off automatically ~
Lesson 63: Putting the LED into the relay clicker circuit ~