3.Volume and EXT. Section/L/R/C/SW
L EXT. Input
Buffer
U2011(OPA4134)
Output Buffer
U2025(OPA4134)
Volume
U2037(WM8816)
Main L Output
13dBr(DAC)
0.5dBr
0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2021(OPA2134)
Mute
Q2022, Q2023(SC3326)
Attenuation
R2230, R2231(220R), R2205(47R)
0.5dBr
0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2013(OPA2134)
)
r
B
d
5
.
2
(
B
d
0
)
s
m
r
V
m
0
0
2
(
B
d
0
From DAC L
-20dBfs
13dBr
is -32dBfs if
without "SW"
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensate
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
R EXT. Input
Buffer
U2011(OPA4134)
Output Buffer
U2025(OPA4134)
Volume
U2037(WM8816)
Main R Output
13dBr(DAC)
0.5dBr
0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2021(OPA2134)
Mute
Q2024, Q2025(SC3326)
Attenuation
R2232, R2233(220R), R2206(47R)
0.5dBr
0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2014(OPA2134)
)
r
B
d
5
.
2
(
B
d
0
)
s
m
r
V
m
0
0
2
(
B
d
0
From DAC R
-20dBfs
13dBr
is -32dBfs if
without "SW"
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensate
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
C EXT. Input
Buffer
U2012(OPA4134)
Output Buffer
U2026(OPA4134)
Volume
U2038(WM8816)
Main C Output
13dBr(DAC)
0.5dBr
0dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
2.5dBr(EXT)
Buffer
U2024(OPA2134)
Mute
Q2026, Q2027(SC3326)
Attenuation
R2234, R2235(220R), R2207(47R)
0.5dBr
0.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2015(OPA2134)
)
r
B
d
5
.
2
(
B
d
0
)
s
m
r
V
m
0
0
2
(
B
d
0
From DAC C
-20dBfs
13dBr
is -23dBfs if
mode is PL2 or
PL2X or
NEO:6
13dBr(DAC)
2.5dBr(EXT)
Reduce 12.5dB if input
from DAC and Compensate
gain if DAC output is
changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
SW EXT. Input
Buffer
U2012(OPA4134)
LPF(1KHz 1st)
U2026(OPA4134)
Volume
U2038(WM8816)
Main SW Output
13dBr(DAC)
10.5dBr
10dBr(150mVrms)
Muti-Source Selector
U2059(TC9274N-008)
12.5dBr(EXT)
Buffer
U2024(OPA2134)
Mute
Q2028, Q2029(SC3326)
Attenuation
R2236, R2237(220R), R2208(47R)
10.5dBr
10.5dBr
If load is
10Kohms,
attenuation is
0.5dB
DAC LPF(55KHz 2rd Butterworth with 16.5dB gain)
U2016(OPA2134)
)
r
B
d
5
.
2
1
(
B
d
0
1
)
s
m
r
V
m
2
3
6
(
B
d
0
1
From DAC SW
-20dBfs
13dBr
is -36dBfs if
all are "small"
13dBr(DAC)
12.5dBr(EXT)
Reduce 2.5dB if input from
DAC and Compensate gain
if DAC output is changed
Reduce 4dB if DIALNORM
is 27
Reduce 2dB if input from
EXT.
3-8
Summary of Contents for M15 C/AH
Page 24: ...WIRING DIAGRAM 3 13 ...
