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Electrical engineering

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#### Course content

#### Introduction to electrical engineering

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#### Circuit analysis

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#### Amplifiers

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#### Semiconductor devices

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#### Electrostatics

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#### Signals and systems

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#### Home-made robots

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#### Lego robotics

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225 Lessons

Getting started

Electric current

Current direction

Voltage

Conventional current direction

Circuit elements

Ideal circuit elements

Ideal sources

Circuit terminology

Sign convention for passive components

Resistor circuits

Series resistors

Parallel resistors (part 1)

Parallel resistors (part 2)

Parallel resistors (part 3)

Simplifying resistor networks

Voltage divider

Analyzing a resistor circuit with two batteries

DC circuit analysis

Kirchhoff’s current law

Kirchhoff’s voltage law

Labeling voltages

Application of the fundamental laws (setup)

Application of the fundamental laws (solve)

Node voltage method (steps 1 to 4)

Node voltage method (step 5)

Mesh current method (steps 1 to 3)

Mesh current method (step 4)

Natural and forced response

Capacitor i-v equations

A capacitor integrates current

Inductor equations

Inductor kickback (1 of 2)

Inductor kickback (2 of 2)

RC natural response – intuition

RC natural response – derivation

RC natural response – example

RC step response – intuition

RC step response setup (1 of 3)

RC step response solve (2 of 3)

RC step response example (3 of 3)

Sketching exponentials

Sketching exponentials – examples

LC natural response intuition 1

LC natural response intuition 2

LC natural response derivation 1

LC natural response derivation 2

LC natural response derivation 3

LC natural response derivation 4

LC natural response example

AC circuit analysis

AC analysis intro 1

AC analysis intro 2

Trigonometry review

Sine and cosine come from circles

Sine of time

Sine and cosine from rotating vector

Lead Lag

Complex numbers

Multiplying by j is rotation

Complex rotation

Euler’s formula

Complex exponential magnitude

Complex exponentials spin

Euler’s sine wave

Euler’s cosine wave

Negative frequency

AC analysis superposition

Impedance

Impedance vs frequency

ELI the ICE man

Impedance of simple networks

KVL in the frequency domain

Operational amplifier

What is an operational amplifier?

Non-inverting op-amp

Feedback

Inverting op-amp

Virtual ground

Virtual ground – examples

Summing op-amp

Diode

Diode

Diode graphical solution

Electric force and electric field

Coulomb’s Law

Fields, potential, and voltage

Proof: Field from infinite plate (part 1)

Proof: Field from infinite plate (part 2)

Electric potential energy

Fourier series

Fourier Series introduction

Integral of sin(mt) and cos(mt)

Integral of sine times cosine

Integral of product of sines

Integral of product of cosines

First term in a Fourier series

Fourier coefficients for cosine terms

Fourier coefficients for sine terms

Finding Fourier coefficients for square wave

Visualizing the Fourier expansion of a square wave

All about Spout

3rd graders build robots at Santa Rita Elementary School

SPDT switch

Spout’s sliding SPDT switch

Spout lights

Spout motor

Spout battery configuration and polarization

Spout’s reversing circuit and final assembly

Spout Bot with Solder

Parts for Spout

Spout tools

Soldering Safety

Spout switches

Spout motor mount

Spout motor wiring

Spout wiring for LED eyes

Spout antennae and tail

Spout Bot without Solder

Tools and parts to build a Spout

Connect the SPDT switches

Attach the LED eyes

Wire the SPDT switches

Create the motor mounts

Secure and wire the motors

Install on/off switches

Connect the LEDs to an on/off switch

Attach Spout’s antennae

Add Spout’s tail

Give Spout some grippy feet

Spider parts and tools

Spider’s click n’ stick

Battery and motor mounts for Spider

Click n’ stick base & batteries

Spider’s motor controller

Spider’s power switch

Spider’s bezel

Spider’s wheels

Spider’s Arduino Nano

Motor controller connections

Spider’s LED eyes

Spider’s stabilizer bar

Spider’s romance

Ben Eater’s Spider

Spider Bot

6th graders learn to build a Spider robot

Fun with Spider Bot

5 volt power distribution board

Digital recorder/player connections

Power connector for the Arduino

Prototype board

Motor controller connection to Arduino

Camera connection to the Arduino

Bumper switches

LED eyes

IR sensor

Chassis modifications

Camera wiring update

Bit-zee Bot

Bit-zeeeeeeeeeee

Bit-zeeeeeeeeeee (long version)

Introduction

Planning and propulsion

Parts

Chassis/frame

Wheel mounts and fenders

Component mounting holes

Batteries/power

Battery wires

Power wires and on/off switch

Motors/propulsion

Motor controller functions

Motor controller

Motor controller connections

Arduino connections

Digital camera connections

Digital camera connections II

Introduction

Anything is possible!

DLab: Inspired by sumo robots

Introduction to programming using lego NXT

Light guitar

Demo: light guitar

Data wires

Math block

Coin detector

Demo: coin detector

Construction

Rotation sensor

Switch statements & logic

Design review (calibration)

Polling sensors (Opens a modal)

Ant bot

Demo: ant bot

Robot construction

Move block

Switch block (nested)

Programming basics

Move block

Loop block

Switch block

Switch block (nested)

Switch statements & logic

Math block (Opens a modal)

Variable block (counter)

Data wires

Polling sensors (Opens a modal)

Household items

What is inside an alarm clock radio?

What is inside a coffee maker?

What is inside a tap light?

Hair dryer

What is inside a hair dryer? (1 of 2)

n What is inside a hair dryer? (2 of 2)

Compare the hair dryer motor to the one you can build

DVD player

What is inside a DVD player? (1 of 5)

What is inside a DVD player? (2 of 5)

What is inside a DVD player? (3 of 5)

What is inside a DVD player? (4 of 5)

What is inside a DVD player? (5 of 5)

What is inside a universal remote control?

Digital camera

What is inside a digital camera? (1 of 2)

What is inside a digital camera? (2 of 2)

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