So the simplest diagram gives very good approximation (for this
kind of work) to A
v
, and with h
0
gives correct A
x
. r
xn
is not much less
than h
x
\ but g
out
is rather more affected by the finite value of R
G
,
though still not enough to worry about. Even without allowing for h
Q
the answers, obtainable in a few seconds, are good enough for a
preliminary estimate.
Sometimes the values of r
b
and r
e
(Fig. 12.10) are given instead of
h
x
and h
T
. The working r
xn
is then r
b
+ (h
f
+ l)r
e
as explained in Sec.
12.6,
and as 1 is usually negligibl ...
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