John Santiago's Blog

Circuit Analysis for Dummies to be Published in April 2013 or May 2013

For those who are interested in a Circuit Analysis book to go along with some of the videos, my first and new book will be published sometime during April or May 2013. The book is entitled, Circuit Analysis for Dummies (yep...the same yellow brand as the other dummies series books. I was asked to write the book back in May-Jun timeframe of…

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Added by John Santiago on February 5, 2013 at 9:00pm — No Comments

Circuit Analysis II: Introduction to Waveforms (Sinusoidal, Exponential) and the Unit Step Function

So far we've only talked about dc signals in circuit analysis. These constant signals do not change in time. However, signals must change with time to carry information. The series of videos will cover three basic, time-varying signals used in linear circuits as well as being used to create more complex signal.

An electrical signal such as a current i(t) and voltage v(t) is a…

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Added by John Santiago on March 29, 2010 at 9:43am — No Comments

Circuit Analysis Modeling: ORCAD - SPICE Simulation and Tutorial (Voltage Divider)

As a schematic editor, OrCAD allows you to draw circuit schematics. The program has a nice collection of circuit parts or components to allow you to perform their assignments and laboratory exercises.

PSPICE is an electrical simulator that allows you to model the operation of circuits whose schematic was prepared using ORCAD. Students can now check for correct circuit operation before building the circuit in the lab.

The student version of ORCAD runs PSPICE without leaving… Continue

Added by John Santiago on March 28, 2010 at 11:30am — No Comments

Basic Introduction to Active Filters and its Applications

Here is a short introduction to active filters and its applications. Active filters have comparable frequency selective performance when compared to passive filters. Active filters require power since operational amplifiers are involved to provide gain but do not require inductors since they can be large and lossy, especially for low frequency applications.

Briefly, let's begin the talk about the electric filter invented during World War I. These filters and… Continue

Added by John Santiago on March 1, 2010 at 6:13pm — No Comments

Update: Engineering Tutorials and Plans

Here's a short update that I posted on YouTube on my future plans on developing EE… Continue

Added by John Santiago on February 23, 2010 at 8:40pm — No Comments

Playlist of videos on Signal Processing

Here is a series of videos on Signal Processing, including some topics in digital signal processing, convolution, z-transform, Fourier representation, sampling and other… Continue

Added by John Santiago on November 28, 2009 at 4:00pm — No Comments

Interactive Simulations and Animations for Teaching Physics, Chemistry, and Physical Science

If and when technical subjects like physics or engineering are to be taught online interactive simulations and experiments must be available to reinforce important concepts.

Here, is one resource that provides fun, interactive, research-based simulations of physical phenomena from the PhET(Physics Education Technology) project at the University of Colorado. This is an ongoing project with over sixty simulations designed to teach… Continue

Added by John Santiago on November 17, 2009 at 10:30am — No Comments

Digital Signal Processing (DSP) Tutorial: Euler's Formula - Part 1

One of many videos on digital signal processing. Initial background is needed to discuss the basics of DSP. Here, we talk about the remarkable mathematical relationship and formula known as Euler's… Continue

Added by John Santiago on November 15, 2009 at 2:40pm — No Comments

Digital Signal Processing (DSP) Tutorial: Introduction to Geometric Series and the Discrete-Time Fourier Transform

This is an introduction to digital signal processing. Here, we begin with an introduction with geometric series and its application to finding the Fourier Transform for discrete-time signals.

More videos will be upcoming as to explain the Fourier… Continue

Added by John Santiago on November 15, 2009 at 11:30am — No Comments

Submit Algebra Problems To Over 1000Tutors For Free

For those who have kids and have trouble with algebra or to those who just want to sharpen their math skills and help people who find math challenging, here's a resource I found at http://www.algebra.com where there are over 1000 tutors available.

I've used to this resource to help many students. For example, here are over 1200… Continue

Added by John Santiago on October 18, 2009 at 11:30am — No Comments

Overview and Introduction to the z-Transform (Polynomial & Rational Functions)

Here's the first of a series on the z-Transform. Comments are welcomed.

We introduce the z-transform bringing polynomials and rational functions to help analyze linear discrete-time systems. The discrete-time convolution (or FIR convolution) is equivalent to polynomial multiplication and algebraic operations in the z transform domain can be translated as combining or decomposing linear time-invariant (LTI) systems. The most common z-transforms are rational functions, that is, the… Continue

Added by John Santiago on July 6, 2009 at 6:53am — No Comments

Circuit Analysis - Thevenin Equivalent and Resistance - Part 1

In many design instances, we frequently need to connect between circuits requiring an interface. As a result, there are analytical techniques used to handle these situations.

Usually, signals from another circuits feeds into a another part of a circuit, called a load circuit. The one generating the signal is called the source circuit. This interaction between the source and load circuit at the interface is a key design issue.

One of the most valuable analytical tools to… Continue

Added by John Santiago on April 18, 2009 at 9:45am — No Comments

Signals and Systems

Here is a series of videos on signals and systems. You can also find these videos at https://www.youtube.com/drjctu on the playlists section.

Added by John Santiago on March 11, 2009 at 2:36pm — No Comments

Discrete-Time Convolution Example (Inverse z-Transform)

You can view the convolution as the inverse z-Transform of Y(z)=H(z)U(z) where Y(z), H(z), and U(z) are the Laplace Transform of the output response, impulse system response, and input signal, respectively. DVDs are in progress and are based on market demand on selected topics.

Part 1 - Introduction

Part 2 - Discrete-time Convolution… Continue

Added by John Santiago on March 11, 2009 at 2:30pm — No Comments

Circuit Analysis and Design

Here's a series of over 30 videos on Circuit Analysis and Design that I posted at http://www.YouTube.com/drjctu.

Let me know if you find them useful.

Added by John Santiago on March 10, 2009 at 9:00am — No Comments

YouTube Videos from Freedom University

All,

Here's the link to various videos posted on YouTube from FreedomUniversity.TV.

http://www.YouTube.com/drjctu

Below is a playlist on Circuit Analysis and Design:

Here is a playlist on tutorials or examples on how to use Matlab or Simulink.…

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Added by John Santiago on January 25, 2009 at 4:30pm — No Comments

Fourier Transform and Its Applications

I've recently found a set of videos on YouTube posted by Stanford University. The course is entitled,Fourier Transform and Its Applications. In the layout at the above link, I would add lecture notes to follow the video lecture (I assume Stanford has those available for their students and if you read on the description and click on the appropriate link at YouTube you can find the lecture… Continue

Added by John Santiago on October 6, 2008 at 7:30pm — No Comments

Matlab Examples - Amplitude Demodulation Using Synchronous Detection

Here is a Matlab demonstration using Simulink on synchronous detection.

Synchronous detection is used to demodulate Double Sideband Suppressed Carrier AM (DSB-SC AM). Also known as coherent or homodyne detection, the scheme requires phase information to track the phase drift of the transmitted carrier in order for this detection scheme to work.

A basic component used to achieve this detection scheme is a phase-locked loop (PLL) circuit. The PLL circuit is more complicated… Continue

Added by John Santiago on June 27, 2008 at 2:30pm — No Comments

Matlab Examples - Amplitude Modulation

Here is an example using Matlab's Simulink to demonstrate the concept of Amplitude Modulation. Two types of amplitude modulation schemes are discussed: Double Sideband Suppressed Carrier (DSB-SC) AM and Double Sideband Large Carrier (DSB-LC) AM. DSB-LC AM is used your standard and commercial AM… Continue

Added by John Santiago on June 25, 2008 at 5:00pm — No Comments

Discrete-Time Convolution Examples (Inverse z-Transform)

You can view the convolution as the inverse z-Transform of Y(z)=H(z)U(z) where Y(z), H(z), and U(z) are the Laplace Transform of the output sequence response, impulse system response, and input sequence, respectively. DVDs are in progress and are based on market demand on selected topics.

Part 1 - Introduction This is an introduction to the convolution sum before giving you an example in Part 2.

Part 2 - Discrete-Time Convolution… Continue

Added by John Santiago on April 20, 2008 at 4:00pm — No Comments

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