Realistic STA-7 - Built-in Protector Circuits Description; Current Limiter Function; Thermal Shut-down Circuit; Muting Circuit

TP2
161514131211109
rc
101
LA
3350
|
23 4
5 6
7I
FM STEREO
ALIGNMENT
SET-UP
Figure
17
STEREO
MOOULAYOR
orsroRTroN
METER
TERMINAL
TAPE OUT
JACK
Figure
18
6.
BUILT.IN
PROTECTOR
CIRCUITS
DESCRIPTION
1)Current
Limiter
lf
speaker terminals are shorted, the output
line is
grounded
and
excessively
high
current
flows
through
the
Output
stage
in the
lC,
This high current
is sensed by
the Current
Limiter
circuit
in the
lC
and decreases the output current
(because
of output current
limiting).
lf
this should
occur, turn
off Receiver. When
problem
is corrected, turn the
Receiver
on again.
2) Thermal
shut-down
circuit
lf
the chip temperature
reaches
approximately
150"C,
the output
power
and
current drain are
automatically
reduced
to
protect
the
device.
3)Muting
circuit
Shock
or
"pop"
noise
occurring
during
power
"on"
is
reduced
by a built-in
muting
system.
NOTE:
+Bz
is
a
regulated
power
supply,
whose rise time constant
is maintained at approx.
2 seconds
to achieve
muting for
this
clip.
(MAIN
AMP
lC HA-1350)
+82
+Bt
!
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