1
2
3
4
5
6
7
8
A
B
C
D
8
7
6
5
4
3
2
1
D
C
B
A
ISSUE
DRAWING NO.
23425
DRAWING TITLE
Drawn by:
DATE
Filename
ECO No.
DESCRIPTION OF CHANGE
J:\Change Control\ECO AGENDA\02 E000 L878 cap voltage correction\L878 3.3A.ddb - Documents\L878C2 3.3A.sch
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
DVD AV PCB - Power
Circuit Diagram
L878C2
PG
7-Jan-2002
INITIALS
Date Printed
2
7
Sheet
of
Notes:
From Torroid
Vin
I
ADJ
A
Vout
O
Z1
LM317T
Vin
I
ADJ
A
Vout
O
Z4
LM337T
+ C5
100U EL
+ C6
100U EL
+ C7
470U EL 25V
+ C8
470U EL 25V
R9
22R 1W CF
+12VA
-12VA
Vin
I
ADJ
A
Vout
O
Z2
LM317T
+
C10
10U EL
+ C20
22U EL
+5V_DAC_L
R10
22R 1W CF
Vin
I
ADJ
A
Vout
O
Z3
LM317T
+
C12
10U EL
+ C21
22U EL
+5V_DAC_R
HS1
TO220HS30REG
+12V
+ C23
10U EL SM
+5V_CLOCK1
Power for clock oscillator
+UR
-UR
PWR
1
IN1
2
IN2
3
0V
4
V-
5
O
6
FB
7
RC
8
V+
9
Z6
TA7317P
XMUTE
+UR
+
C25
100U EL SM
-UR
+
C30
1U0 EL
Q_19
QPAD
Q_20
QPAD
Q_21
QPAD
Q_22
QPAD
Q_23
QPAD
Q_24
QPAD
Q_25
QPAD
Q_26
QPAD
Q_27 QPAD
MUTE CIRCUIT
+
-
RLY2C
RLY DPDT SM
+12V
D8
BAS16W SM
RL_MUTE
1
2
3
4
5
6
7
8
SK5
AMPCT8
+ C26
100U EL SM
+12V
L1
33UH 2A RA
+5V
+ C27
100U EL SM
Q_28QPAD
Q_29
QPAD
+5V_VID
Digital power & video power
RL MUTE
+12VA, -12VA, +5V_DAC_L, and +5V_DAC_R are analogue supplies
+5V and +12V are digital supplies
+5V_VID is derived from +5V
ANALOGUE POWER
(11 8V)
(-11.8V)
R50
0R0 MF
Q1
BC849B
C22
100N 0805
C32
100N 0805
D1
3V9 0W5 SM
C33
100N 0805
Vin
I
GND
G
Vout
O
Z5
7805
Q_62
QPAD
+12V
+5V_CLOCK2
Power for clock buffers
FLT3
7G002
C34
100N 0805
C35
100N 0805
C36
100N 0805
C37
100N 0805
FLT4
7G002
Vin
8
GND
2
Vout
1
Z9
78L05 SM
BYG22D is in Simons Library
+
C29
10U EL SM
C13
100N 0805
C14
100N 0805
Use hrough hole for C20 and C10
To allow for audio tweaking
1
2
3
4
SK4
MOLEXPWR4
MOLEXPWR4 is in Simons library
R16
1K 0805
R17
1K 0805
R15
10K 0805
R36
10K 0805
R34
10K 0805
R35
10K 0805
R53
3K3 0805
R60
3K3 0805
R48
2K2 0805
R51
390R 0805
R52
390R 0805
R12
330R 0805
R13
330R 0805
R44
47K 0805
R45
47K 0805
R46
47K 0805
R47
47K 0805
R41
8K2 0805
R42
8K2 0805
+ C1
3M3 EL
+ C3
3M3 EL
+ C19
10U EL SM
+ C103
10U EL SM
+ C104
10U EL SM
F1
FUSE T375MA SM
F2
FUSE T375MA SM
NF
NF
NF
NF
+ C9
22U EL
+ C11
22U EL
R49
33K 0805
00_1136
PG
24/11/00 Issue 3 PCB with 8740 DACs
3.0
01_1000
PG
02/01/01 Change R9,R10 from 100R to 22R
3.1
R9,R10 changed from 100R to 22R at rev 3.1
01_1047
PG
15-03-01 Diodes changed from 3B22D to 3BS1D
3.2
D10
S1D
D2
S1D
D3
S1D
D4
S1D
D5
S1D
D6
S1D
D11
S1D
D12
S1D
D7
S1D
D13
S1D
D14
S1D
D15
S1D
D16
S1D
PG
13/11/01 C155 changed to 100R
3.3
02_E000
PG
07/01/02 Admin change - cap voltages corrected on BOM
3.3A
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