Pioneer SA-5800 Посібник з експлуатації - Сторінка 6
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PHONO
AUX
TUNER
REC PLAY
REC
PLAY
TAPE
i
TAPE 2
REC
PLAY
REC
PLAY
R
CHANNEL
RECTIFIER
} TO
FLHEATER
Equalizer Amplifier
Power Amplifier
This
all-stage
direct-coupled
pure
complemen-
tary
SEPP
circuit features
a current mirror load
differential
amplifier
in the
first stage,
and in-
corporates
the tone
control
circuits
in the NFB
loop.
Although the incorporation of the tone control
circuits in the power amplifier stage reduces the
number
of elements
that the signal has to pass
through, and thereby further reduces noise, distor-
tion,
and
cost,
the
power
stage does require
a
higher gain and a higher degree of stability. In the
SA-5800,
this high gain and high stability
are
achieved
by
a current
mirror
load
differential
amplifier
in the first stage and by the use of a
bootstrap
circuit
for the
load
of the pre-driver
stage.
The power stage is a Darlington connection pure
complementary
SEPP
circuit,
resulting
in
an
output
power
rating
of 25W+25W
(82,
20Hz-
20kHz,
THD 0.03%).
ln 39.548
VOLUME
|
at IkHz
( SAME
AS
VOLTAGE
REGULATOR
CONTROL
SUBSONIC
FUNCTION
©
SPEAKER
lL
CHANNEL)
ore
.
©
SPEAKER
B
} TO POWER
STAGE
The tone controls (BASS, TREBLE)
are operat-
ed by changing
the frequency
response
of the
power amplifier NFB circuit.
Power Supply Muting
TO EQ AMP,
FIRST
STAGE
OF POWER
AMP.
POWER
ac
-
LINE
| :
TO
POWER
STAGE
Fig. 4-1
Power supply and muting circuit