"John Stoler" <email@example.com>
WWW page response
Sun, 16 Nov 1997 10:53:50 -0700
Kudos on a fine (read:
excellent) piece of web construction.
I have been around since
the dino and have evaluated a book or two in my
days, but as far as
teaching goes, I have not evolved nearly as far as yourself.
The electronics tutorial
is not just well done, it is a credit as to what we should be looking for
on the www.
I showed your page to
my wife and tried to explain to her how this type of
work will eventually
transend the garbage currently being force fed to the
populace (down with
Good luck with your web
authoring and best of luck.
Sat, 27 Dec 1997 05:56:31 -0500
Robert Shields <firstname.lastname@example.org>
Love your ECE 480 Site!
Hello Dr. Williamson,
My name is Robert
Shields and I am writing to encourage you to keep up
the good work.
I am a recent Electrical Engineering graduate of Virginia
Tech in Blacksburg,
VA and happened to come across your wonderful site
The explanations and illustrations of
are superb! The site has so much "life" even without
background sound ...
I spent so much time on the site that I had to write
and express my gratitude
for such an enjoyable Internet experience.
Mon, 11 May 1998 21:48:59 -0700
Your web site is exactly
what I have been looking for, for a long time now.
It is very explanatory
without going into "way over my head" technical
lingo. I can finally
understand what's going on. Thanks and keep up the
I will let you know if
there is anything I would like to see that's not
"Josh Logan" <email@example.com>
Sat, 6 Jun 1998 06:45:52 -0600
Your site is really great
Josh Logan N7XM
Thu, 04 Jun 1998 17:26:00 -0700
"Brian P. Wilson" <firstname.lastname@example.org>
My goodness! I
came across your site when doing some research for a
presentation I have
to give in my ENGR 333 class.
I will certainly be visiting
your site again when I have more time. I'm
still a little awestruck
at the quantity and quality of the material you
have to offer.
Mon, 01 Jun 1998 04:53:46 -0700
"Robert A. Huber" <email@example.com>
I visited your website
today and got a real boost in my web interest.
If possible, can you
answer one question about the 555 for me?
I am trying to produce
a delay circuit with the 555 and need the output NOT to change unless no
input occurs for time longer than the output time.
In short I want the
one-shot to be retriggerable.
Thank you, and best regards
Bob Huber KC8JUL
513 398 1550
mason, ohio 45040
Wed, 12 Nov 1997 14:01:19 -0600
"Larry L. Ward" <LLW@selu.edu>
You've got a great!
web page.........best I've seen yet.
Larry L. Ward
Hammond, La. 70402
Jim Kehler <firstname.lastname@example.org>
Tue, 12 May 1998 13:57:16 -0000
to find your web page, and I think it's one of the most
interesting ones I've
seen. I'm a ham radio operator, but I'm not
an electronics engineer,
and I find your pages very informative.
I'm at the point in
my ham career (25+ years) where I finally have
some time to sit down
and build a few simple things, and the basic
info you have about
transistors, the 555 chip, etc., I find very
I'm trying to design a sort of VOX circuit, not having
much luck, but having
lots of fun and getting lots of solder on the
I saw somewhere on you page that you metiioned you
were a ham also.
73, Jim KH2D
Mariana Islands DX Association
Wed, 10 Dec 1997 21:57:17 -0500
Joseph Michael Hensley <email@example.com>
This page is really cool.
I did my 480 project on Gilbert Cell
for the neat stuff.
Fri, 17 Apr 1998 14:55:02 -0400
"E. Carranza" <firstname.lastname@example.org>
Your web page
I would like to congratulate
you on such an amzing web page
that you are created.
I like all the animations,
they simplify the learning process very much.
I hope that you keep
this web page growing as it would be very sad
to see such good material
I am sure that this
take a lot of your time to mantain, but you are
doing an excellent job.
Power Supply Design
Sat, 11 Apr 1998 20:35:25 EDT
Re: 555 timer
Thanks that answered
my question perfectly. I am using a 555 timer and some D flip flops
for a computer engeering project and the drawing in the book was hard to
understand. Thanks for all of your help
Sun, 29 Mar 1998 15:27:22 EST
I just finished viewing
your website, very impressive. It has been difficult to find information
on electronics on the web. Your website seems to cover many details
on the subject. I am bookmarking your site for future visits.
Keep up the good work
and please, please keep it free.
"Bill Thomas" <email@example.com>
Sat, 28 Mar 1998 20:28:32 -0500
Just a note to extend
my thanks to you for a great site concerning 555.
Sun, 05 Jul 1998 11:43:42 -0700
Irvine Bernard Rogers <firstname.lastname@example.org>
A GREAT HOME PAGE
TO: Glen A. Williamson
- A GOOD HOME PAGE
I'M A RUSTY ELECTRONICS
TECHIE FROM THE 60'S - AND WAS LOOKING FOR AN
OLD UJT TIMER CIRCUIT
TO PULSE A 12 VOLT ALARM BUZZER (ie. 2 sec every
15 sec to conserve battery),
WHEN I FORTUNATELY STUMBLED
ON YOUR TRANSISTOR PAGE - A FUN REFRESHER.
ALTHOUGH I COULD NOT
FIND A UJT RELAXATION TIMER ON THE WEB, I DID FIND
YOUR PAGE IS A GOOD
RESOURCE OF VALUE, WELL AND ENJOYABLY PRESENTED.
A FUN REFRESHER.
IRVINE B. ROGERS
Thu, 25 Jun 1998 11:55:30 -0400
"Andrew O'Malley" <email@example.com>
Ryerson Polytechnic University
Hello . . .
I needed the 555 data
sheet, so I did a web search, and your site came
up first on the list,
and I found everything I needed . . . Checked out
a bit more of your site,
and found it all very well put together.
"If no one's laughing,
you can bet they've been paid
find out what's going on."
- Wed Jun 24 15:44:38 1998
"Norman, Russ" <Russ_Norman@mukilteo.hac.com>
Your 555 Timer Web page!
I am an engineering
aide with Raytheon Systems Company and was having a
problem with a delay
generator circuit one of our engineers had designed. Through a web
search I found your site and I must say it was quite helpful. It
turned out we had forgotten the differentiator on the input to both stages
to the LM 556. Once installed it worked as advertised! Thanks
for the wonderful site, you saved our project several hundred dollars!
Senior Engineering Aide,
Raytheon Systems Company
Sun, 14 Jun 1998 22:17:04 -0700
"Derek D. Bass" <firstname.lastname@example.org>
I've been reading various
pages about Laser Microphones and their
practicality and portability,
and I was wondering, given the variety of
given on your site, what your personal findings
were as to the kind
of fidelity you could expect with any of them. I'm
writing a fiction piece
based upon 'Weird Science' (the genre, not the
movie), and I'd like
to know what is possible in reality before I take
it a couple of steps
further. Actually, I was hypothesizing about such a
device, and decided
to look on the Internet to see if there was anyone
else working on the
same idea. It was kinda nice to see this sort of
thing in a 400-level
class in Electrical Engineering, since my own
schooling is in Psychology.
I'm starting to ramble now, so I'll go. Any
profanity and obscenity) would be most welcome, and
I thank you in advance
for your time.
Derek D. Bass
P.S. That's a nice site
on Laser Microphones you've got there. That's
why I wrote you in the
Wed, 15 Apr 1998 15:59:14 -0400
"Renard A. Dellafave" <email@example.com>
Hello from a recent alum
I graduated Dec. 96
(BSEE,SCL) and have been working for a small
electronics firm ( http://www.4pi.com
) for almost a year now.
I found your ECE480 pages
while looking for an online data sheet for the
NE555, seeing as how
the ones here are probably a decade old. Interesting
trick with the AC coupled
trigger, but tolerances will be tight if I try to
get 2.5uS pulses out
of a chain of 555 monostables. Maybe too tight.
Anyway, I browsed on
to your decoupling page, and had a suggestion/question
about the LC power filter
arrangement you show on the amplifier cascade.
Would it not be better
to use a "star" configuration where the high side of
each L is connected
to the power supply?
The design as shown
would provide a larger inductance for the sensitive
first amp, though, at
lower cost than using five different value inductors.
As always with BDSG,
there are many options, often with no clear one
standing out as superior
- hence it getting the name "black magic" so often.
Well, anyway, while I
don't miss the rest of college, I do miss the
and reading your webpages has shown me a few things,
reminded me of a few
more, and if nothing else, made me think. Thanks for
Tue, 24 Mar 1998 19:51:39 -0600
Jonathan Newman <firstname.lastname@example.org>
suggestion for http://www3.ncsu.edu/ECE480/480_555.htm
great site. Very
helpful. I think you should add some more uses for the
555 and include formulas.
Wed, 25 Mar 1998 00:00:00 -0600
"Glen A. Williamson" <email@example.com>
Jonathan Newman <firstname.lastname@example.org>
Re: suggestion for http://www3.ncsu.edu/ECE480/480_555.htm
I wasn't expecting a
reply so quickly. Could I trouble you just a bit?
I'm playing with using
2 555s to generate a PWM waveform, and I'm not
really getting anywhere.
The first timer works fine generating a carrier.
The second isn't exactly
modulating it too well. Let me know if this is
not your area of interest.
Thanks again for the great site.
"Fadi Awaida" <email@example.com>
Fri, 6 Mar 1998 16:15:07 +0200
Dear Mr. Williamson,
I heared of your internet
page from a friend of mine in San Fransisce and
I checked it.
Simply, it was my dream page - just what I needed!!!
I am a computer engineering
student and i'm about to graduate this year,
God willing. I
thought you might help me since i am a part of an important
project which is to
build an FM Radio station for the whole University!!!
It is a big project
that has many parts and many persons working in it.
The group that is working
on that project is a respectable group in my
university and is known
as the "Engineering Society" and is funded by the
members are computer and electrical engineers.
Your assistance will
be reported to our dean and will show on our papers
So, please, help us in
finding the right schematics and diagrams.
Also, I want to know
if you do "sell" the circuit parts (all kinds of
transistors, op amps,.....etc).
I'll be waiting your
answer on that so please take us into concideration.
And if you feel you
don't have time for that please feel comfortable to
say it "quickly" because
we are limited in time.
Thank you, sir.
adi w. awada
Fri, 09 Jan 1998 16:28:06 -0500
Christopher Bruno <bruno@ICD.Teradyne.COM>
Your web page is fantastic.
I'm an ME with a Master's
from Worcester Polytechnic
Institute and I think your
is most valuble. However, I
think there is an error
on your page.
On 480_base.html I think you will find that
one of the equations
in the Ohm's law table is
is, the one that say P=I^2/R
should read P=I^2 *
Just trying to help!
321 Harrison Ave. MS/H63
Boston, MA 02118