For our study group, I found that Chapter 3: Working with Op-Amps to be very
helpful. I remember that Bill had the insight for B:CP when working with these
electronic devices.
In the same vein, the U.S. Navy's Electricity and Electronics Training
series are available online: http://jacquesricher.com/NEETS/
"The Navy Electricity and Electronics Training Series (NEETS) was
developed for use by personnel in many electrical- and
electronic-related Navy ratings. Written by, and with the advice of,
senior technicians in these ratings, this series provides beginners
with fundamental electrical and electronic concepts through
self-study. The presentation of this series is not oriented to any
specific rating structure, but is divided into modules containing
related information organized into traditional paths of instruction."
The teaching format might possibly be familiar to Fred Nickols?
It is so that the op-amp's presence doesn't influence the system
that provides the input. It’s an idealized violation of the quantum
physics law that observing something affects the thing observed.
The quotes seem to have been lifted from same source as the
WIkipedia article on Operational Amplifiers. They are idealizations
in the same way that it is an idealization to say that a control
system keeps the perceptual signal at its reference value (or to say
that error is maintained at zero). The Wikipedia article goes into
some of the implications of various idealizations.
Here’s the context in Wikipedia. I don’t know whether the Wikipedia
article is easier or harder to understand than the Dummies book
David recommends, but it is at least more accessible.
----Wikipedia quote—
···
On 2013/08/8 11:28 AM, D GOLDSTEIN
wrote:
[David Goldstein (2013.07.08.11:38)]
On page 381, the following
statement is made: "The characteristics are often summed up
with the following two
“golden rules” of op amps:
1. the output attempts to do
whatever is necessary to make the voltage difference
between the inputs zero.
(perceptual signal = reference signal).
2. The input draws no
current.
Not sure how this last
“golden rule” applies.
An ideal op-amp is usually considered to have the following
I. The output attempts to do whatever is necessary to make the
voltage difference between the inputs zero.
II. The inputs draw no current.[5]:177
The first rule only applies in the usual case where the op-amp is
used in a closed-loop design (negative feedback, where there is a
signal path of some sort feeding back from the output to the
inverting input). These rules are commonly used as a good first
approximation for analyzing or designing op-amp circuits.[5]:177
None of these ideals can be perfectly realized. A real op-amp may
be modeled with non-infinite or non-zero parameters using
equivalent resistors and capacitors in the op-amp model. The
designer can then include these effects into the overall
performance of the final circuit. Some parameters may turn out to
have negligible effect on the final design while others represent
actual limitations of the final performance that must be
evaluated.
It's familiar to me on two counts. First, my initial training as a fire
control technician entailed going through six weeks of basic electricity and
electronics at Great Lakes Naval Training Center in 1955. We took that; so
did electronics technicians, electricians and several other technical
ratings. Second, that was all classroom instruction and I was later on the
staff of the Instructor Training School. Yep. It rings a bell. Thanks for
the pointer.
Fred Nickols
From: Matti Kolu [mailto:matti.kolu@GMAIL.COM]
Sent: Thursday, August 08, 2013 12:25 PM
To: CSGNET@LISTSERV.ILLINOIS.EDU
Subject: Re: Re.: B:CP A book of interest
[From Matti Kolu (2013.08.08.1830 CET)]
David Goldstein (2013.07.08.11:38)--
> I wanted to recommend to you the following book:
>
> Electronics for Dummies by Doug Lowe.
>
> For our study group, I found that Chapter 3: Working with Op-Amps to
> be very helpful. I remember that Bill had the insight for B:CP when
> working with these electronic devices.
In the same vein, the U.S. Navy's Electricity and Electronics Training