On this page I will post spreadsheets, software, various computer files, and other information that electronic engineering students and engineers may find useful.

Sources for Electronic Test Equipment  By popular demand, here is a list of some very good sources for electronic test equipment and manuals.

Note: I am in the process of scanning many pages of interesting hand notes I have developed over several decades and will be posting those here.  Once I get them all posted I will reorganize this page to make it easy to find related notes.  Initially, things are going to be in random order.  The following list will be growing during 2009.

Hall Network  This is an interesting passive RC notch filter that is tunable via a single potentiometer.  The notes are primitive right now -- more is coming.
Hall Network Symbolic Analysis   This is a scan of a symbolic analysis I did of the Hall Network back in 1979.  I worked on it during lunch where I worked for several weeks before I got it all right. This is a huge picture that full size is around 34" x 22". Although tiny it can be printed in landscape mode on a single 8.5" x 11" sheet and is still perfectly readable.  The analysis might be a little hard to following since there is no guidance other than the circled numbers for the main steps.  Guidance notes are in the above article.  This is an example of perseverance -- it is often that math explodes like this but ultimately becomes very simple.  There are a few errors where I wrote 's' that should have been 'w'.  My thanks to coworker, Kristin O'Connor, who skillfully used Photoshop to stitch the individual sub scans of this into one perfect document.  Coming soon -- a spreadsheet to explore the circuit design and frequency response.

Frequency Filter Notes  These are a collection of various hand notes concerning the analysis and design of low-pass, high-pass and band-pass filters.

Impedance Matching This shows the derivation of a variety of ways to match one impedance to another using two reactive elements.  It is a little crytic but if you know what you are doing it makes perfect sense.

Notes on Transistors and Diodes  These are an extensive set of notes I developed for teaching an engineering course concerning diodes and transistors including details on analysis and design rarely found elsewhere.  You could spend hours on the information in this link.

Notes on Operational Amplifiers  These are an extensive set of notes I develoed for teaching an engineering course concerning operational amplifiers and applications.  You could spend hours on the information in this link.

General Electronics Notes  This link has a couple of useful information for electronic engineers at around the middle of the page.

68hc11.asm This ASCII file is a learning aid to the instruction set of the Motorola 68HC11 processor. I developed this file for use when I taught EE337. The file shows all permutations of each instruction along with a pseudo-C equivalent of the instruction. The instructions are also logically grouped. I recommend that anybody working with a new processor develop an equivalent file. This file can be assembled by the assembler to see the hex codes for each instruction. There are a few minor errors that I intend to fix someday.

The Science of Design This is a paper that I wrote and presented some years ago about the design process based on my many years of experience designing electronic circuits. I have adapted it for posting on the Internet.

An Introduction to Design Reviews This is a paper that I wrote to assist students preparing for a design review.

Impedance Measurement  This is a short note about how to measure complex impedance with a simple setup and some calculations.

Managed Alias Sampling  This brief note discusses a clever method to eliminate power line alias for low frequency sampled data systems where the sample frequency is low compared to that of the power line.

rf_enclosure_design.pdf  This is a brief note that describes the fundamentals of designing an enclosure that is opaque to RF energy.

bjt_analyzer.xls Spreadsheet for analyzing bipolar transistor amplifiers.

jfet_analysis.xls Spreadsheet for analyzing field-effect transistor amplifiers.

op_amp_calculator.xls Spreadsheet for doing basic operational amplifier calculations.

frs.xls Spreadsheet for calculating frequency response of up to 7^th order system. Version 1.3 corrects an error in earlier versions.
lpf_design.xls Spreadsheet for designing Butterworth and Chebyshev low-pass filters of up to 16^th order

salen_key_design.xls Spreadsheet for designing components for Sallen-Key low-pass filter section.

a2dsim.xls Spreadsheet for doing experiments with analog to digital and digital to analog converters.

ee431lab8.pdf Some experiments to try using a2dsim.xls.

debounce.c Version 1.00 - Robust algorithm for de-bouncing mechanical contacts or noisy bit streams in software.

nfilter.c Version 1.00 - Algorithm for smoothing noisy data for display. Smooth and fast at the same time!
nlfilter_demo.xls  Version 1.00 -- This is a demonstration of nlfilter.c and illustrates operation via a graph.  User can change settings to study the effects.

ctrlbang.c Version 1.00 - Bang-bang controller algorithm. A revised version is coming soon.

ctrlpid.c Version 2.3 - PID control algorithm with integrator management. This new version has practically a textbook on applied PID control in the comments.  This is the stuff you do not get in the classroom -- only from the school of hardknocks.

wp_clip.c  This is a short routine for clipping wild points out of a data stream derived from analog systems.  The comments are a brief text on the subject.

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