Videos

Class Prep Videos

  • Video 2: The Voltage Divider and Team Responsibilities

  • Video 3: Specification (“Spec”) Sheets

  • Video 4: Frequency Dependent Circuits

  • Video 5: Some Key Concepts and Addressing Each Configuration

  • Video 6: Reverse Engineering in Our Study of Inductors

  • Video 7: Inductors and Transformers

  • Video 8: Motor Project

  • Video 9: DC Motors

  • Video 10: Feedback and Op-Amps

  • Video 11: Math with Op-Amps and Ideal versus Real Circuit Components

  • Video 12: Real Op-Amp Differentiators

  • Video 13: Thevenin Equivalent Sources

  • Video 14: Indirect Measurements for Control Applications

  • Video 15: Beam Velocity Measurement Using DIY Guitar Pickup

  • Video 16: Math, Estimates, Multi-Stage Circuits, Specifications

  • Video 17: Relays

  • Video 18: Threshold Detection and Relays

  • Video 19: Analog Discovery Digital Measurements

  • Video 20: 555 Timers

  • Video 21: Switch Debouncing

  • Video 22: Diodes

  • Video 23: AC to DC Conversion

  • Video 24: Zener Diodes, LEDs, Photodiodes/Phototransistors.

  • Video 25: Pulse Modulation

Topic Videos

Complex Arithmetic

  • Part 1: Quick review of complex numbers, complex plane, polar representation, and Euler’s Identity.

  • Part 2: The real and imaginary parts of ratios and magnitudes of complex numbers.

  • Part 3: The phase of a complex number.

Transfer Functions

  • Part 1: The impedances of R, L, and C; RC circuit transfer function; simplifying transfer functions.

  • Part 2: The RC transfer function at low and high frequencies (not zero and infinity); corner frequency.

  • Part 3: Corner frequency and summary of major features of transfer functions; phase; physical meaning of low and high frequencies.

  • Part 4: Comparison of resistive, inductive, and capacitive impedances at low and high frequencies; replacing L and C with open and short circuits; discussion of open and short circuits.

  • Part 5: Both types of RC circuits.

  • Part 6: RL circuit corner frequency; real vs. ideal inductors; using the ideal capacitor to model real capacitors.

Transformer Properties

  • Part 1: General intro to solenoid properties and principles of transformer operation.

  • Part 2: More on transformer properties and notation.

  • Part 3: First assumption and beginning to set up the circuit equations

  • Part 4: The second and third assumptions for ideal transformers, continuing to set up the circuit equations.

  • Part 5: Deriving the ratio of secondary to primary current and the input impedance of a transformer. The voltage ratio is not derived.

  • Part 6: Final comments on modeling and design of transformers.

Inductance Formulas

  • Part 1: How to use simple formulas to predict inductance values for home made coils.

  • Part 1: Long solenoids, online resources to check your answers.

  • Part 1: Why ideal models are useful.

Thevenin Equivalent Sources

The Voltage Divider

This set of videos explores the general voltage divider and its use in various applications. It is not necessarily constructed with just resistors.

  • Part 1: What is a divider and how does it work if we build one?

  • Part 1.1: Measuring input and output voltages to fully characterize the operation of a circuit, with and without a load.

  • Part 2: Deriving the formula for an unloaded and a loaded divider

  • Part 3: Building and testing a loaded voltage divider. Both noise and loading of the divider by an oscilloscope become significant issues.

  • Part 4: Studying voltage dividers constructed with combinations of resistors, inductors and capacitors that function as filters. Some additional general properties of dividers are also identified.

  • Part 5: The use of voltage dividers for measuring internal resistances of sources and loads such as battery resistance and the input resistance of measurement devices like voltmeters and scopes. Also for determining the resistance of resistive sensors like photocells, strain gauges and force sensors.

  • Part 6: The role of voltage dividers in the operation of transformers.

  • Part 6.1: Designing circuits by functional blocks.

  • Part 7: Deriving the transfer functions for inverting and non-inverting op-amp amplifiers using what we know about voltage dividers. Also, voltage dividers where neither end is at zero Volts – a generalization useful for non-inverting op-amps and Schmitt Triggers.

  • Part 8: Configuring two voltage dividers into a Wheatstone Bridge circuit. Other uses of dividers as voltage references.

  • Part 9: How does SPICE work? The material in this video is not required for EI but is useful for anyone who wishes to understand circuit analysis a little more deeply.

  • Part 10: Transistor and relay switches. The Schmitt Trigger.

  • Part 11: Digital Logic Circuits and the 555 Timer

  • Part 12: Diode Rectifiers - Dividing voltage between diodes and resistors.

  • Part 13: Powering LEDs - Dividing voltage between an LED and a current-limiting resistor.