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.

EEWeb.com This link has a wide variety of
electronics information for students and engineers alike. Material is
always being added to the site so check back often.

http://news.slashdot.org/story/12/02/28/2138200/schematics-and-circuit-simulation-in-the-browser?utm_source=rss1.0mainlinkanon&utm_medium=feed
This is a
link to a circuit simulator that works in the browser.

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. See the following link for an
article I wrote concerning the Hall Network that was published Jan. 31,
2012 in the online version of Electronic Design. http://electronicdesign.com/analog/rediscover-truly-tunable-hall-network
. This is a deep link and may get moved from time to time. If the
link does not work then go to http://www.electronicdesign.com and
do a search for "hall network". A precursor to the article was hall_network.pdf . I am keeping
it here for the time being since others have linked to it but it now includes
the above link to the complete article. You might find the original
submission, Design and
Applications of the Hall Network
,
a little easier for printing.

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 cryptic
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 developed for
teaching an engineering course concerning operational amplifiers and
applications. You could spend hours on the information in this
link.

Feedback
Effects on Amplifier Response This is an introductory note for students
seeking to understand how negative feedback reduces amplifier gain and widens
frequency response. The companion spreadsheet for this note is feedback_amplifier_response.xls .

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.

http://hsi.web.cern.ch/HSI/s-link/devices/g-ldc/decouple.pdf
An excellent off-site article about the use of decoupling
capacitors. See the spreadsheet below to plot the examples
given.

capacitor_z.xls This is a
spreadsheet to calculate and plot the net impedance of up to three capacitors in
parallel. Each capacitor model includes ESR and series inductance.
Very interesting impedance effects can be seen with arbitrary capacitors.
Different size capacitors have to be combined with care in bypass and similar
circuits.

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.

Introduction to H-bridges This is
a note
for students needing to build an H-bridge.

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.

Distortion
Analyzer This is a short article on how to build a simple harmonic
distortion analyzer using the notch technique with simple components. It
is intended for people who have a need to measure distortion down to below 1
percent at 1,000 Hz but can not afford a more advanced instrument.

A Method for Locating Short Circuits
This is a short article that describes how to locate a short between two nets on
a printed circuit board. This is often very hard to do but becomes easy
with the right technique.

debounce.c Version 1.00 - Robust algorithm for de-bouncing mechanical contacts or noisy bit streams in software. There is an article about this algorithm and universal code at Debounce Algorithm Using Integration

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.

Servo Tuning This is a draft of a piece I
am working on concern tuning of P, PD, PI, and PID controllers. The
ctrlpid.c file below implements the features discussed. An Excel
spreadsheet simulation, thermal_control_simulator.xls, will be posted in
the near future.

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 hard knocks.

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.

http://www.inictel-uni.edu.pe/publicaciones/reportes-tecnicos This is a link to some great technical articles on electronic circuits written by Ramon Vargas who teaches at a university in Peru. Many of the pdf articles near the bottom of the link are in English so do not let the Spanish you will initially see scare you away. Even those articles that are in Spanish are highly mathematical and since math is the universal language you can easily tell what is going on. Definitely check these out. The information in these articles is of the sort that is hard to find but highly useful. http://www.ramonvargas.webs.com/ This is the personal web site of Ramon Vargas and has more very informative articles about electronics. I highly recommend these two web sites!