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5
QQ
3 7 63 1515 0
POWER AMP UNIT
D401
FSF10A20
CN401
!
CDE9073-A
1
+OUT N
2
-OUT N
NFB N
3
Center N
4
From Voltage Amp
D402
FSF10A20
This circuit amplifies power. A three-stage Darlington structure is
adopted, which includes the output SEPP at the voltage amplifier
stage, driver stage (Q401, Q402), and final stage (Q403-Q412),
which has 5-parallel push-pull composition.
TE
L 13942296513
REGULATOR UNIT
www
.
This is a basic feedback-type constant-voltage circuit.
The forward voltage (Vf) of the LEDs (D303, D305, D307 [D304,
D306, D308]) is used as the reference voltage, which is 5.4 V (1.8
V × 3).
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C401
470p/125V
AMCH
Q401
!
2SC3519A
R405
4.7 1/2W
R401
!
10 1/2W
!
!
!
!
R402
!
10 1/2W
R406
4.7 1/2W
Q402
2SA1386A
!
C402
470p/125V
AMCH
x
ao
y
i
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6
8
Q403
Q405
!
!
2SC3519A
2SC3519A
R407
R409
4.7 1/2W
4.7 1/2W
!
!
R429
R431
120 1/2W
120 1/2W
!
!
!
!
R430
R432
120 1/2W
120 1/2W
!
!
R408
R410
4.7 1/2W
4.7 1/2W
Q404
Q406
2SA1386A
2SA1386A
!
!
All these allow driving of 600-W, 4-ohm output speakers without
difficulty.
This circuit belongs to the AB class, with total idle current of 0.5 A
(a product with power output up to 2 W belongs to the A class).
Q Q
3
6 7
1 3
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.
To suppress the influence of power fluctuations, a current mirror
circuit (constant current circuit) that constituts of Q307-D309
(Q308-D310) is used. Adjust the output voltage (VR301, VR302) to
±55 V.
TAD-M600
6
7
2 9
9 4
2 8
Q407
Q409
!
!
2SC3519A
2SC3519A
R413
R411
4.7 1/2W
4.7 1/2W
!
!
R433
R435
120 1/2W
120 1/2W
!
!
!
!
!
!
R434
R436
120 1/2W
120 1/2W
!
!
R412
R414
4.7 1/2W
4.7 1/2W
Q408
Q410
2SA1386A
2SA1386A
!
!
1 5
0 5
8
2 9
9 4
m
co
7
8
9 9
A
+B
Q411
!
2SC3519A
R437
120 1/2W
B
OUT
R438
120 1/2W
Q412
2SA1386A
!
-B
C
2 8
9 9
D
+55V
GND
-55V
E
F
15
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