Circuit diagram

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A
B
C
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4321
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C
B
A
Title
NumberRevisionSize
B
Date:16-Jan-2013Sheet of
File:E:\AMP\AMP3120\Milly\3120.DDBDrawn By:
AMP3120 amplifier V1.0
guolijuan
ground
ground
ground
ground
ground
audio input Sat-L
audio input Sub
audio input Sat-R
powersupply plus
powersupply minus
-46V
+46V
+
C1
100uF/16V
R2
1K8
R5
220R
R24
10K
R4
7K5
R3
470R
R17
100R
R18
100R
R19
7K5
C2
1nF
Tr12
BC546B
Tr13
BC546B
R30
10K
mute
Tr1
2SA970GR
Tr2
2SA970GR
+14V
+
C3
100uF/16V
R1
680R
Tr3
MJE340
C5
100pF
R9
470R
R11
10R
R12
100R
R35
100R
R36
1K1
R25
100R
R10
10R
R6
0R33/5W
R7
0R33/5W
R15
22R
R26
22R
Tr4
2SA1837
C13
100pF
Tr6
2SA1943 O
+
C14
1uF/63V
Tr8
2SC2240GR
Tr7
2SC5200 O
Tr5
2SC4793
Tr11
2SA970GR
+
C4
10uF/16V
R13
1K
R14
1K8
Tr9
2SC2240GR
protect1
C12
100pF
R8
220R
R27
1K2
R28
6K8
R29
6K8
+
C9
470uF/16V
R22
3K3
R23
10K
ZD2
10V/0.5W
+46V
-46V
L1
2uH
AMP-OUT SatL
C6
100nF
1
J7
SAT-L
Satellite Left
+
C18
100uF/16V
R42
1K8
R45
220R
R60
10K
R44
7K5
R43
470R
R57
100R
R58
100R
R59
7K5
C19
1nF
Tr27
BC546B
Tr28
BC546B
R66
10K
mute
Tr17
2SA970GR
Tr18
2SA970GR
+14V
+
C20
100uF/16V
R41
680R
Tr19
MJE340
C22
100pF
R49
470R
R51
10R
R52
100R
R67
100R
R68
1K1
R61
100R
R50
10R
R46
0R33/5W
R47
0R33/5W
R55
22R
R56
22R
R62
22R
Tr20
2SA1837
C25
100pF
Tr22
2SA1943 O
+
C26
1uF/63V
Tr24
2SC2240GR
Tr23
2SC5200 O
Tr21
2SC4793
Tr26
2SA970GR
+
C21
10uF/16V
R53
1K
R54
1K8
Tr25
2SC2240GR
protect2
C24
100pF
R48
220R
R63
1K2
R64
6K8
R65
6K8
+46V
-46V
L2
2uH
AMP-OUT Sub
C23
100nF
1
J8
Sub
+
C27
100uF/16V
R70
1K8
R73
220R
R88
10K
R72
7K5
R71
470R
R85
100R
R86
100R
R87
7K5
C28
1nF
Tr39
BC546B
Tr40
BC546B
R94
10K
mute
Tr29
2SA970GR
Tr30
2SA970GR
+14V
+
C29
100uF/16V
R69
680R
Tr31
MJE340
C31
100pF
R77
470R
R79
10R
R80
100R
R95
100R
R96
1K1
R89
100R
R78
10R
R74
0R33/5W
R75
0R33/5W R83
22R
R84
22R
R90
22R
Tr32
2SA1837
C34
100pF
Tr34
2SA1943 O
+
C35
1uF/63V
Tr36
2SC2240GR
Tr35
2SC5200 O
Tr33
2SC4793
Tr38
2SA970GR
+
C30
10uF/16V
R81
1K
R82
1K8
Tr37
2SC2240GR
protect3
C33
100pF
R76
220R
R91
1K2
R92
6K8
R93
6K8
+46V
-46V
L3
2uH
AMP-OUT SatR
C32
100nF
1
J9
SAT-R
Subwoofer
Satellifier Right
Tr10
BC546b
Voltage of input transistors
R21
2K2
R20
33K
ZD1
15V/0.5W
+
C7
10uF/16V
+
C8
100uF/16V
+
C15
1uF/63V
+46V
+14V
Tr14
2SA970GR
Tr15
2SA970GR
Tr16
2SC2240GR
short circuit protection
R31
3K3
R32
3K3
R33
100K
R34
33K
R37
10K
R38
10K
R39
10K
R40
10K
D1
BAV21
D2
BAV21
D3
BAV21
C16
10nF/63V
+
C17
1uF/63V
protect1 protect2 protect3
+46V
mute
D1+D2+D3: BAV21 or other diode with URRM>150V and 200mA
Power supply
+
C10
470uF/50V
+
C11
470uF/50V
-46V
+46V
1
J3
place them between power transistors close to heatsink.
Tr8,Tr24,Tr36 are quiescent current transistors.
Notice:
1
2
3
4
5
6
7
8
9
10
J1
pop up supr
pop up surp
pop up surp
R16
22R
1
2
3
J4
from power supply PCB
ground
DC-minus
DC-plus