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Foundations of Wireless and Electronics, 10th Edition
book

Foundations of Wireless and Electronics, 10th Edition

by M. G. Scroggie, S. W. Amos
October 2013
Intermediate to advanced content levelIntermediate to advanced
570 pages
27h 46m
English
Newnes
Content preview from Foundations of Wireless and Electronics, 10th Edition
176
to
4.6 mA: an
increase
of 1.1 mA. The
voltage drop
due to R
therefore increases
by 1.1 x 20 = 22 V. So the
voltage
at the
anode
(KJ falls
by
that amount.
Note that
a
grid voltage change equal
to
1
V has
caused
an
anode
voltage change
of 22 V, so we
have achieved
a
voltage multi-
plication—called amplification
or
gain—of
22. If the
anode
had
been connected direct
to a
170
V
battery there could
of
course have
been
no
change
in V
a
at all, and the
working point would have moved
to
C,
representing
an 7
a
increase
of 3.3 mA. The
reason
why the
increase with
R in
circuit
was
only 1.1
mA was the
drop
of
22V
in V
a
,
which partly offset
the
rise
in
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Publisher Resources

ISBN: 9781483105574