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Newnes Circuit Calculations Pocket Book
book

Newnes Circuit Calculations Pocket Book

by Thomas J. Davies
April 2016
Intermediate to advanced content levelIntermediate to advanced
384 pages
12h 56m
English
Newnes
Content preview from Newnes Circuit Calculations Pocket Book
Filters and attenuators 315
For stage 2
W
3
19.9
antilog - 0.5 = 0.316
19.9 x 0.316 = 6.29 W
For stage 3
6.29
antilog 0.8 = 6.3
W
4
= 6.29 x 6.3 = 39.69 W
Note that
39.69
Overall gain = 10 ^g
-
^
-
= -1.0 dB
which agrees with
-4 - 5 + 8 = -1 dB
(See program 271, page 311.)
18.3
Low pass filters
A low pass filter transmits low frequencies and attenuates high
frequencies. A typical frequency response is shown in Figure 18.5.
At low frequencies the output voltage is constant, but as the
frequency is increased a point will be reached when the output will
begin to fall. The cut-off frequency, /
c
, is where the output voltage
VQVT
1.0
3dB
down
0.707
0 ...
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Publisher Resources

ISBN: 9781483101132