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DISTORTION
RANGE ATTENUATOR
{S3)
Front Panel
mounted 6-way
push
button
switch consisting
of
one
'straight
through' position and
five
10
dB
steps.
,
i
j
-
j
0
10
20
30
AHENUATtON
(dB)
40
60
60
70
80
0.5
0.7
1
1.5
2
FREQUENCY(f/fo)
Fig.
3.
2
Fundamental
rejection characteristics
of
TF
2337A
Filter.
DISTORTION
AMPLIFIER
(QUO
to
Q113) 54
dB
gain,
adjusted
in the
feedback
circuit
by
R159
(DIST
GAIN).
DISTORTION
AC/DC CONVERTER
(QA106/QA107)
similar
circuit
to
the level
a.
c./d.
c.
converter
but
differs
in
gain
and
output
polarity.
RATIO CIRCUIT
comprises
an
up-down
integrator
and pulse width
to d. c.
converter as
shown
in
simplified
form
Fig. 3.3.
3.3.1
Detailed description
of
Ratio Circuit
Fig.
3.3
Simplified
diagram
of ratio circuit.
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