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  TM 11-6130-385-34
3-15.
Recovery
drive
3-27. Modulator Circuit
output
filter
is
directed
to
the
output
voltage
con-
(fig.
3-16)
trol.
The
feedback
signal
is
also
connected
to
a
turn
a. The
high
frequency
6.4-kHz
square
wave
signal
on
sense
output
(at
terminal
20)
which
is
coupled
to
the
overcurrent
sense
and
foldback
circuit
on
the
A
from
the
oscillator
board
enters
the
modulator
board
phase
modulator
board.
as
two
square
waves
180
degrees
out
of
phase.
They
c. The
output
voltage
control
circuit
are
capacitor-coupled
to
differentiate
for
the
sum-
receives
the
feedback
signal.
Potentiometer
R356
ming
diode
circuit
CR305,
CR306.
The
resultant
and
temperature
compensator
unit
U310
develop
the
12.8-kHz
signal
is
introduced
to
the
ramp
generator
signal.
The
signal
is
then
delivered,
with
dc
input,
to
(U305)
and
initiates
the
output
data
(ramp)
to
the
comparator
U306.
Transistor
Q304
functions
as
an
output
drive
board.
Ramp
generator
U305
also
integrating
amplifier
with
dc
output
and
is
applied
to
delivers
a
ramp
reset
blanking
signal
to
Q309,
Q310.
field
effect
transistor
Q306
which
controls
amplitude
b. A
400-Hz
sine
wave
feedback
signal
from
the
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