- 8 -
SCHEMATIC DIAGRAM
UD-503
UD-503
1
2
3
4
5
6
7
8
A
B
C
D
E
Z
ANALOG PCB (1/5)
T0.5A 250VAC
T0.5A 250VAC
T0.5A 250VAC
T0.5A 250VAC
5V/3.5mA
Remove C656
Remove R722
MOSI
SCK
CS_CTRL
CS_DAC
CS_VOL
P10V_R
GND
GND
GND
GND
GND
D3P3V VCC
D3P3V
GND
GND
P10V_L
N10V_R
GND
GND
N10V_L
GND
D3P3V
GND
GND
GND
GND
GND
GND
GND
GND
GND
D3P3V
GND
NB10V_L
NB10V_R
D3P3V
GND
GND
D3P3V
GND
GND
GND
RCA_N_L 4
RCA_P_L 4
HP_ON_L 4
XLR_ON_L 4
N_DAC_RST0 2
XLR_ON_R 5
HP_ON_R 5
RCA_N_R 5
RCA_P_R 5
N_DAC_RST1 3
HP_BAL 5
2
L
_
N
I
A
3
R
_
N
I
A
2
L
_
V
5
P
3
R
_
V
5
P
SDOV0 2
DAC_MDI1 3
DAC_MDI0 2
SDOV1 3
BCK1 3
SDATA1 3
LRCK1 3
MCK1 3
BCK0 2
SDATA0 2
LRCK0 2
MCK0 2
DAC_MC1 3
DAC_MC0 2
SCKV0
2
SCKV1
3
DAC_MS0 2
DAC_MS1 3
VOL_CS0 2
VOL_CS1 3
HP1L 4
HP2R 5
DGND 4,5
R535
22
R710
47
Q503
2SC4081
Q506A
EMD2
6
2
1
+
C503
1.0u/50V
D510
RB160L-60
R788
10k
R743
10k
R683
100k
R744
1.5k
D513
RB160L-60
C653
0.1u
R747
4.7k
C506
0.1u
D534
RB551V-30
R502
22k
R742
2.7k
D508
1SS355VM
C652
0.1u
+
C514
47u/16
V
R748
4.7k
R794
10
D504
RB160L-60
R795
10
R531
47
D507
1SS355VM
R786
100k
D503
RB160L-60
TP506
PAD
R536
22
R501
10
k
C672
0
R781
10k
C516
1000p
R793
100k
R529
47
R503
12k
R685
180
+
C655
22u/16V
Q554
DTC124EUB
R687
180
Q507
RXH090N03
SOURCE1
1
SOURCE2
2
SOURCE3
3
GATE
4
DRAIN1
5
DRAIN2
6
DRAIN3
7
DRAIN4
8
C654
220p
C504
0.01u
R528
47
R521
100
+
C512
47u/16
V
R504
47k
Q500
RRH075P03
SOURCE1
1
SOURCE2
2
SOURCE3
3
GATE
4
DRAIN1
5
DRAIN2
6
DRAIN3
7
DRAIN4
8
R541
22
R770
100k
C509
0.01
u
R530
47
Q505
RRH075P03
SOURCE1
1
SOURCE2
2
SOURCE3
3
GATE
4
DRAIN1
5
DRAIN2
6
DRAIN3
7
DRAIN4
8
F504
37205000001
P511
B11B-ZR
1
2
3
4
5
6
7
8
9
10
11
R537
47
L501
BLM18PG471SN1D
R538
22
Q555B
EMD2
3
5
4
P501
B3B-EH
1
2
3
Q502B
EMD2
3
5
4
D502
RB160L-60
D506
1SS355VM
TP531
R532
47
R771
220k
+
C501
4700u/35V (KMG
)
U501
BA033FP-E2
IN
1
OUT
3
NC
2
FI
N
4
P502
B3B-EH
1
2
3
TP533
C517
0.1u
+
C508
4700u/35V (KMG
)
C657
0.01
u
R745
1.5k
D515
1SS355VM
D514
1SS355VM
D505
1SS355VM
R711
47
C671
N.M
TP535
PAD
1
1
TP536
PAD
1
1
C518
1.0u
TP507
PAD
P506
B8B-ZR
1
2
3
4
5
6
7
8
U519
NJU7181RB1
IN
1
AMP_OUT
2
TRIN
3
GND
4
CAP_D
5
RES_D
6
OUT
7
VCC
8
F501
37205000001
R534
22
D533
RB551V-30
Q501
RXH090N03
SOURCE1
1
SOURCE2
2
SOURCE3
3
GATE
4
DRAIN1
5
DRAIN2
6
DRAIN3
7
DRAIN4
8
TP530
C510
0.1u
Q502A
EMD2
6
2
1
U502
BD45285G
ER
1
SUB
2
GND
3
VOUT
4
VDD
5
Q506B
EMD2
3
5
4
R787
100k
TP529
R533
22
R522
180
Q555A
EMD2
6
2
1
R511
47k
R523
47
+
C502
4700u/35V (KMG
)
C515
0.1u
R686
180
R540
22
TP505
PAD
R689
180
R509
22k
+
C507
4700u/35V (KMG
)
R751
4.7k
U503
SN74LV595A
SER
14
SRCLK
11
SRCLR
10
RCLK
12
G
13
QA
15
QB
1
QC
2
QD
3
QE
4
QF
5
QG
6
QH
7
QH
9
VCC
16
GND
8
F502
37205000001
R769
10k
TP534
R542
47
R539
22
+
C505
220u/25V
R510
12k
R508
10
k
R750
4.7k
D512
RB160L-60
F503
37205000001
D501
RB160L-60
Q504
DTA124EUB
R749
4.7k
D511
RB160L-60
U520
SN74LV541APW
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
A7
8
A8
9
G1
1
G2
19
Y1
18
Y2
17
Y3
16
Y4
15
Y5
14
Y6
13
Y7
12
Y8
11
R746
22k
R684
100k
V
V
V
V