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BALANCED INPUT
C103
+V
25V 100n
C15
V-
LREF
25V 100n
LEFT CHAN
1K54
9K760
JB4
R27
R22
2
C11
LIN_XLR
3
1
220p
NUTRIX
C12
LREF
220p
R25
9K760
JB2 1
3
5
1K54
R26
LIN_PH
S
R
T
NO_GOLD
2
4
6
S3
L
M
COM
1
2
3
S3
L
M
COM
5
6
7
RIGHT CHAN
RREF
25V 100n
V+
NO_GOLD
2
4
6
25V 100n
S
R
T
RIN_PH
JB1 1
3
5
1K54
9K760
R13
R16
C6
JB3
RREF
220p
2
RIN_XLR
3
1
NUTRIX
C5
220p
R11
9K760
1K54
R12
FILTER
TO PIN 4 OF MC33078
D7
R10
56K
C9
4148
56K
R28
220p
LREF
9K760
C34
C33
16v
68N
16v
68N
R23
R109B
MC33078
4M7
1/2
C30
C29
3
U4
16v 150N
16v 150N
1
2
R20
LREF
C10
120K
220p
TP1
9K760
R24
STEREO,MONO: RSIG = RSPOST
BRIDGED: RSIG = LSPOST
R
MONO-STEREO-BRIDGE
4
S3
L
M
R
COM
9
10
11
12
10R
R111
(4=V-,8=V+)
MC33078P
10R
R
.
8
R112
L
M
R
COM
C16
C39
V-
TO PIN 4 OF MC33078
C8
220p
RREF
D4
9K760
4148
R15
R19
56K
MC33078
56K
R9
1/2
3
U1
C31
C32
1
16v
68N
16v
68N
2
R109A
4M7
C7
C27
C28
220p
16v 150N
16v 150N
TP4
R18
9K760
RREF
120K
R14
2
TP2
1
C23
3
U3
16V
33u
1/2
MC33078P
FILTER SWITCH
(4=V-,8=V+)
-1dB 6Hz
5
LVGND
IN
-1dB 40Hz
4
OUT
12Db/Oct
6
S1
.
V+
S2
THIS SIDE
3
OUT
OUT
OF SWITCH
ENABLE
1
NOT USED
IN
IN
DISABLE
2
R6
MC33078
33K
1/2
5
U4
LIMITER
7
6
(4=V-,8V+)
RREF
R119
1/2
5
10K0
U1
7
LREF
6
10K0
10K0
R37
R38
LVGND-28
BRPRTCT
C24
RSPRE
16V
33u
6
RREF
1
7
2
TP3
5
U3
3
RREF
1/2
4
MC33078P
FILTER SWITCH
(4=V-,8=V+)
5
6
-1dB 6Hz
7
2
IN
8
-1dB 40Hz
1
9
OUT
10
3
12Db/Oct
S1
DATE:
APR/22/98
YORKVILLE
NAME:
M1129.SCH
V+
V+
14_PIN_CONNECTOR
LVGND
RSPRE
LSPRE
V-
RSIG
LIMABLE
V-
RSPOST
LSPRE
LREF
LREF
LIMABLE
V+
RSIG
LREF
C13
25V
100n
RSPOST
C14
LSPOST
25V
100n
RREF
V-
LVGND
RREF AND LREF CONNECT TO
LVGND AT THE INPUT JACKS
M1129.SCH_DATABASE_HISTORY
MODEL(S):-
AP4020
#
DATE
VER#
DESCRIPTION OF CHANGE
OCT/97
1.00
FIRST_PRODUCTION
NOV/12/97
2.00
REVERSED_INPUT_POLARITY
D
V
AND_MADE_VALUE_CHANGES_FOR_AP2020
DEC/02/97
2.00
CHANGED_C27,C28,C29,C30_TO_150N
APR/22/98
2.10
PC#5694_ADD_CONNECTIONS_AT_BRIDGE
.
.
SWITCH_FOR_BRPRTCT/LVGND-28
D
V
N
D
V
N
D
V
N
D
V
N
AP4020/AP2020/AP4040
MODELS:
INPUT
PCB#&VER:
M1129-2.00
1
RREF
LREF
BRPRTCT
LSPOST
LVGND-28
V-
V+
FROM_POT_PCB
GND_LIFT
CHGND
S4
S4
1
4
OUT
OUT
2
5
IN
IN
3
6
CHGND
C116
22n
SHEET
OF
1
SCH VERSION:
2.10
TITLE:
INPUT-BD
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