Negative Resistor Lesson

This tutorial is going to cover the topic of negative resistance. At first, it might seem like a strange idea that you could have a current flowing in the opposite direction of an applied voltage; but, hopefully by the end of this tutorial you will have a better intuitive understanding of what a negative resistance… Continue reading

Adding Spice Models to LTspice

Finally… a new tutorial. Who could have ever guessed that life in the real world would be so busy (note the sarcasm!)? This tutorial is going to cover adding custom Spice models into your LTspice simulations and library. While it is very easy once you know how to do it, there are a couple pitfalls… Continue reading

How to Compute the IFFT using only the forward FFT

How can you calculate the IFFT (Inverse Fast Fourier Transform) using only the forward FFT (Fast Fourier Transform)? It is easier than you think! Read on to find out how. Cheat-Sheet: Just tell me how! Derivation of the Method Cheat-Sheet: Just tell me how! Let’s start with just saying straight out what you do. Take… Continue reading

HP 50g Derivatives, Integrals, and Summations Tutorial

Arguably of the best reasons for getting a calculator with a CAS (computer algebra system) is to solve derivatives, integrals, and summations symbolically. Here’s how to do it with the HP 50g. Derivatives Indefinite Integrals Definite Integrals Summations NOTE: This (and all of my other) tutorial assumes that the calculator is in RPN mode. If… Continue reading

HP 50g Variables and Folders Tutorial

This is a basic tutorial on managing variables and folders on the HP 50g calculator. Deleting variables is easy once you know what to, but it gives people trouble at the start when learning how to use this calculator. Using folders effectively is important because it helps with organizing variables and lets you have more… Continue reading

HP 50g Basic Graphing Tutorial

Graphing on the HP 50g took me a while to get used to. You have to go through a few separate menus to create a nice looking graph. This threw me for a loop because I was used to a calculator that had most the options for creating a graph in one place. Here is… Continue reading

MATLAB Beginner’s Guide

This tutorial is meant to help you get started with MATLAB. It assumes you have never used MATLAB and will teach you the very basics of the program. Lets get started. Basic Calculations Creating Variables Using Variables Tips Basic Calculations When you first start up MATLAB your screen should look something like this For right… Continue reading