Williams-ThermionicValveCircuits_text.pdf

(14243 KB) Pobierz
H
THERMIONIC
VALVE
CIRCUITS
BY
EMRYS
WILLIAMS
Ph.D.,
B.Eno
m
M.I.E.E.,
M.Brit.I.R.E.
Professor
of
Electrical
Engineering
in
the
University
College
of
South
Wales
and
Monmouthshire
FOURTH
EDITION
LONDON
SIR
ISAAC
PITMAN
&
SONS,
LTD.
Third
edition
1952
First
edition
1942
Revised
and
reprinted
1955
Second
edition
1944
Reprinted
1956
Reprinted
1945
Reprinted
1958
Reprinted
1947
Fourth
edition
1961
SIR
ISAAC
PITMAN
&
SONS,
Ltd.
PITMAN
HOUSE,
PARKER
STREET,
KINGSWAY,
LONDON,
W.C.2
THE
PITMAN
PRESS,
BATH
PITMAN
HOUSE,
BOUVERIE
STREET,
CARLTON,
MELBOURNE
22-25
BECKETT'S
BUILDINGS,
PRESIDENT
STREET,
JOHANNESBURG
ASSOCIATED
COMPANIES
PITMAN
MEDICAL
PUBLISHING
COMPANY,
LTD.
39
PARKER
STREET,
LONDON,
W.C.2
PITMAN
PUBLISHING
CORPORATION
2
WEST
45TH
STREET,
NEW
YORK
LTD.
(INCORPORATING
THE
COMMERCIAL
TEXT
BOOK
COMPANY)
PITMAN
HOUSE,
381-383
CHURCH
STREET,
TORONTO
SIR
ISAAC
PITMAN
&
SONS
(CANADA),
Emrys
Williams
1961
MADE
IN
GREAT
BRITAIN
AT
THE
PITMAN
Fl—
(T.205)
PRESS,
BATH
PREFACE
TO
THE
FOURTH
EDITION
is
not
about
valves
but
about
valve-circuits.
Many
more
engineers
and
converted
physicists
are
engaged
on
valve-circuits
(in
telephony,
radio
communication,
television,
telemetry,
automatic
control,
radar,
computation,
instrumentation,
etc.)
than
are
engaged
in
valve
design
and
development.
There
is
a
broad
measure
of
disagreement,
however,
on
the
question
of
how
much
a
valve-circuit
engineer
should
know
about
the
inside
of
a
valve.
In
one
well-
known
public
examination,
the
examination
paper
on
valve-circuits
includes
questions
on
a
wide
coverage
of
solid-state
physics
and
the
physics
of
electronic
emission.
This
book
takes
the
opposite
point
of
view,
namely
that
there
is
so
much
of
real
interest
to
be
said
about
valve-circuits
that
a
single,
very
elementary
chapter
must
suffice
for
valves
themselves.
Even
eighteen
years
ago
(when
the
first
edition
was
a
slim
volume
which
fitted
the
pocket
both
physically
and
figuratively)
it
would
have
been
a
masterpiece
of
understatement
to
say
that
enough
was
known
about
valve-circuits
to
fill
a
book.
Today
enough
is
known
to
fill
a
library.
This
book
has
therefore
two
main
purposes:
firstly,
to
serve
as
a
reliable
guide
to
this
wide
field
of
knowledge
and,
secondly,
to
teach
the
subject.
To
achieve
these
ends,
the
scope
of
the
book
must
be
strictly
limited
to
valve
circuits.
To
extend
the
scope,
either
by
including
the
physics
of
the
valve,
or
by
including
cathode-
ray
tubes
and
all
the
other
electron
tubes
which
have
become
important,
would
mean
forgoing
that
prodigality
of
words
which
distinguishes
teaching
from
the
skilled
precis
writing to
be
found
in
the paper-starved
Proceedings
of
professional
institutions.
Electronics
has
become
the
handmaiden
of
almost
all
other
sciences.
As
a
result
many
physicists
and
other
scientists
find
them-
selves
in
need
of
a
more
thorough
and
detailed
understanding
of
valve-
circuitry
than
could
be
provided
by
a
degree-course
in
pure
science.
It
is
hoped
that
this
book
will
meet
their
need.
It
is
hoped,
too,
that
it
will
help
to
dispel
the
idea
that the
valve-circuit
engineer
needs
a
kind
of
intuition,
a
"feel"
for
circuits,
which
cannot
be
explained
or
communicated.
This
myth
persists
as
a
result
of
the
habit
of
ad
hoc
explanation
of
apparently
unrelated
circuits
and
the
failure
to
point
out
their
common
features
of
circuit-
technique.
For
this
reason,
it
has
been
thought
worth
while
in
this
book
to place
more
than
usual
emphasis
on
various
quite
simple
features
(the
a.c./d.o.
separating
circuit,
earthing
and
screening,
etc.)
and
to
stress
and
re-stress
the
importance
of
the
incremental
equivalent
circuit.
It
is
impossible
to
exaggerate
the
importance
of
equivalent
circuits
as
a
means
of
facilitating
both
qualitative
thinking
and
This
book
Vi
PBEFAOE
quantitative
analysis.
In
this
connexion
it
is
not
only
the
equivalent
circuit
of
the
valve
itself
which
is
useful,
but
also
similar
circuits
(each
consisting
merely
of
an
e.m.f.
in
series
with
an
impedance)
which
can
serve as
equivalents
for
a
valve
plus
its
anode
load
impedance,
or
for
valve
plus
anode
load
impedance
plus
cathode
lead
impedance.
The
chief
innovation
in
this
new
edition
is
the
inclusion
of
a
set
of
problems
with
answers.
Since
the
book
is
not
directed
towards
coaching
students
for
examinations,
the
problems
are
not
taken
from
recognized
public
examination
papers
but
are
specially
pre-
pared
for
use
with
this
text.
Many
of
them
are
very
easy
problems,
designed
to
provide
the
reader
with
a
quick
check
on
whether
he
has
understood
the
text.
Among
these
are
some
trick
questions
which
tempt
the
unwary
to
give
an
answer
when,
in
fact,
insufficient
data
is
provided.
These
questions
are
intended
as
a
dire
warning
against
various
common
pitfalls,
arising
from
loose
thinking.
The
trick
questions
would
lose
their
effectiveness
if
the
reader
were
on
the
assumption
that
reviewers
notified
of
them
in
advance,
but
read
prefaces
and
students
do
not
we
may
direct
attention
to
problems
8
and
16
as
typical
cases.
There
are
a
hundred
problems
on
amplifiers
alone.
Some
of
the
problems
are
exercises
in
circuit
design,
and
some
are
exercises
in
the techniques
of
analysis,
including
graphical
methods
of
analysis.
In
the
"Answers"
section,
short
(usually
numerical)
answers
are
given
for
the
easy
or
straightforward
problems,
but
the
more
difficult
problems
are
discussed
at
greater
length.
In
the
preface
to
an
earlier
edition
of
this
book
it
was
stated
that
one
of
the
author's
objects
was
to
cover
all
the
main
types
of
valve
circuit
in
such
a
way
that
the
student
may
be
in
a
position
to
understand,
or
even
foresee,
further
developments.
It
has
therefore
been
thought
legitimate
to
include
a
few
problems
which,
in
addition
to
serving
as
exercises,
introduce
the
reader
to
known
circuits
and
techniques
for
which
space
could
not
be
afforded
in
the
body
of
the
book.
For
example,
it
is
only
among
the
problems
(and
in
the
index)
that
any
mention
is
made
of
the
constant-current
equivalent
circuit,
of
valve-bridges
for
measuring
amplification
factor
and
mutual
conductance,
of
the
phase-shifting
amplifier
and
of
various
methods
of
calculation,
applicable
to
cathode-coupled
stages.
—
—
If
an
author
does
not
know
what
eighteen
years,
it
tell
him.
The
writer's
friends
have
been
commendably
free
from
restraint
and
his
less
inhibited
students
have
quite
clearly
indicated
substantial
part
those
parts
of
the
book
which
needed
re-writing.
of
the
revision
which
has
gone
into
this
new
edition
is
directed
number
of
towards
easier
understanding
and
increased
clarity.
well-known
oscillator
circuits,
described
separately
in
earlier
editions,
have
been
grouped
together
under
the
heading
"Closed-
circuit
Oscillators"
and
a
common
simple
theory
is
now
presented
is
wrong
with
his
book
after
because
his
best
friends
are
afraid
to
can
only
be
A
A

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin