Overview

Delve into the fascinating world of electrons and see how mankind has harnessed their power to create devices that only decades ago seemed like science fiction.

Electronic devices underlie virtually every aspect of modern life. Yet very few of us have any idea of how they actually work. Now, get a working explanation of the principles that govern the electronic circuits and devices you use every day. In these 24 clear and easily accessible lectures, you’ll examine how these devices work, bypassing much of the higher mathematics without sacrificing functional and theoretical understanding.

You’ll get clear introductions to technology including transformers, transistors, capacitors, diodes, resistors, and semiconductors. You’ll also learn:

• The basics of circuit construction

• How to read a circuit diagram

• The inner workings of engineering instruments such as voltmeters, multimeters, and oscilloscopes

• The role played by transistors in controlling electric currents

• How capacitors can be employed to reduce and filter electronic “noise” in circuits

These lectures also provide the tools necessary for ambitious learners to get hands-on experience with the workings of electronics and build their own devices using inexpensive and readily available components. You’ll be provided with example problems and small projects to try, using a pen and paper or online circuit simulators. You’re free to work through the solutions on your own to test your skills, or work alongside award-winning professor Richard Wolfson. Whether you’re an aspiring engineer, an enthusiastic tinkerer, or simply intellectually curious, these lectures will demystify the behavior and inner circuitry of electronic devices and inspire you to see technology in a new light.

Course Structure

01: Electricity and Electronics

What is the difference between electricity and electronics? Begin your study of modern electronics by examining this distinction, and observe how electronics use the basic properties of electric circuits in a more sophisticated way. Witness firsthand how resistance is described with Ohm’s law, and learn how to measure electric power.

Duration: 35 min

02: Circuits and Symbols

Meet the battery! This lecture marks your introduction to circuit diagrams, displaying the interconnected assemblages of electronic components that make a circuit function. Learn how to decipher these drawings, and see how components assembled in series or in parallel may interact differently depending on their configuration.

Duration: 30 min

03: Instruments and Measurement

As you grow familiar with physical properties of electric circuits, become acquainted with the instruments used to measure these quantities: voltmeters, ammeters, ohmmeters, multimeters, and the oscilloscope. See how each of these instruments interacts with a circuit to test circuit behavior or measure quantities that may vary over time.

Duration: 33 min

04: AC versus DC

Examine the nuances of alternating and direct currents, see how transformers use electromagnetic induction to transform voltage levels in AC circuits, and observe the role of diodes and capacitors in regulating current. See how the DC power supplies that charge our cell phones are constructed so that they convert alternating to direct current.

Duration: 28 min

05: Up the Treble, Down the Bass!

From familiar audio equalizers we use to crank the bass or reduce hiss, to cell phone towers that need to separate calls coming in on adjacent channels, filtering electronic signals is often essential. Dive further into the critical role that capacitors play in electronic filters.

Duration: 29 min

06: Semiconductors—The Miracle Material

Semiconductors make possible the transistors at the heart of electronics, including integrated circuits and computers. Learn how the atomic configuration of semiconductors makes them unique, and how engineers adjust their properties to make two types of semiconductors—P and N. Witness the critical role that PN-junctions play in semiconductor devices.

Duration: 29 min

07: Transistors and How They Work

Transistors in all forms fundamentally do the same thing: they allow one electronic circuit to control another. Review the concept of electronic control, and study field effect transistors (FETs) as well as bipolar junction transistors (BJTs). See how the bipolar junction transistor can be used as a simple switch.

Duration: 29 min

08: Transistors as Amplifiers

Discover how transistors can be used to increase voltage, current, or power of an electronic signal while faithfully reproducing the signal’s time variation. See how biasing and load-line analysis play key roles in amplifiers, and help prevent distortion. Learn to design a simple one-transistor audio amplifier that increases the voltage of audio-frequency signals.

Duration: 29 min

09: Building an Audio Amplifier

Put your knowledge to use by building a complete audio amplifier. First, create a two-stage amplifier, then add capacitors to increase the amplification, or gain. Add a power output stage to drive a loudspeaker. Finally, add a volume control. In addition, learn how biasing with diodes can eliminate a subtle form of distortion.

Duration: 31 min

10: The Ideal Amplifier

Learn why large gain—infinite gain, in fact—as well as low output resistance and high input resistance are characteristics of the ideal amplifier. See how an integrated-circuit operational amplifier, or “op-amp,” puts all these things together and also how the op-amp can be used as a simple comparator.

Duration: 32 min

11: Feedback Magic

Define what “feedback” means in electronics, and how it can be used in a circuit. Learn how negative feedback utilizes communication between the output and input of an amplifier, and how operational amplifiers use this phenomenon to create thought-controlled robotic arms, intelligent light bulbs, and optical tracking systems.

Duration: 33 min

12: Electronic Feedback

Understand the math behind two basic rules that allow op-amps to leverage the magic of negative feedback: no current flows into op-amp inputs, and with negative feedback, V+ = V -. See how these rules allow op-amps to tame near-infinite gain in a circuit down to the exact amplification you want.

Duration: 30 min

13: Amplifier Circuits Using Op-Amps

Now that the versatility of negative feedback has been demonstrated, adjust the strength of negative feedback in op-amp circuits to build amplifiers with whatever gain you choose. Create an amplifier that sums two or more inputs, see a circuit that converts current to voltage, and explore the design and operation of an op-amp-based light meter.

Duration: 30 min

14: More Fun with Op-Amps

Explore peak detectors that “remember” the maximum voltage reached, as well as Schmitt triggers whose output retain their value until the input changes sufficiently to “trigger” a change in the output. Use these concepts to design a practical circuit: an alarm to warn if your freezer’s temperature has been above freezing.

Duration: 30 min

15: Using Op-Amps with Capacitors

By introducing capacitors to op-amp circuits, you will see how feedback capacitors can be used to introduce time-dependent behavior such as gradual voltage increases, and to generate useful waveforms. Learn in the process how op-amp circuits with capacitors can perform the mathematical operation called integration.

Duration: 30 min

16: Digital Versus Analog

Explore the difference between the analog and digital realms. Learn how the two states “0” and “1” can be used to represent numbers or textual information. Enter the digital age with binary numbers and operations that are the basis of computer logic, and discover logic gates and their truth tables for common logical operators.

Duration: 37 min

17: Electronics Goes Digital

See how distinctly different electrical circuits can implement basic logic operations, and how simple logic gates come together to form complex logic circuits, ultimately including computers. Return to transistors to see how both BJTs and MOSFETs are used to implement logic gates, the latter in an arrangement called Complementary Metal Oxide Semiconductor (CMOS).

Duration: 40 min

18: Flip-Flop Circuits

By combining logic gates and positive feedback, obtain circuits with two stable states. These “flip-flop” circuits “remember” their current states until they are forced into the opposite state. Learn the inner workings of several types of flip-flops as they lay the foundations for memory circuits.

Duration: 34 min

19: Shift and Divide—Your USB and Your Watch

Learn how electronic devices “talk” to each other by using flip-flops to send computer “words” one bit at a time, and observe how recipient devices reassemble incoming bits using serial-to-parallel conversions. See how Universal Serial Bus (USB) connections transmit communications between devices, and how the T flip-flop is utilized as a frequency divider in quartz watches.

Duration: 31 min

20: Digital Memory

Examine the circuits that enable your devices to “remember” everything from contact information to your browsing history to the keystrokes you type on your computer. Compare random-access memory versus sequential memory as well as volatile and non-volatile memory.

Duration: 30 min

21: Digital Counters

Flip-flops can be connected together to create counting circuits. Examine the circuitry behind 2-bit, n-bit, and decade counters, then see how the interruption of a light beam can be used in conjunction with such a circuit to keep count of people walking by or products moving along an assembly line.

Duration: 29 min

22: Digital to Analog

Because we live in an analog world—sound, time, temperature, speed, and light are all analog phenomena—it’s important to be able to convert outputs of digital circuits into analog signals that we can perceive. Discover two digital-to-analog converters (DACs): weighted-resistor DACs, and the delta-sigma DACs that provide high-resolution audio for our smartphones and mp3 players.

Duration: 30 min

23: Analog to Digital

Observe how circuit designers have formulated a wide array of schemes for converting analog signals to digitally encoded information. See how flash converters, integrating converters, and feedback converters use very different methods to accomplish the same goal, and weigh the situational costs and benefits of each.

Duration: 31 min

24: Your Future in Electronics

With some final tips, an introduction to the microcontroller, and a demonstration of an amazing circuit aimed at improving the efficiency of photovoltaic panels, Professor Wolfson leaves you with an enhanced appreciation for the complexity of essential modern electronics. You are now well equipped to embark on your own journey through the fascinating world of electronics!

Duration: 35 min