EN-31
ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L297 CT3 Headphone Amp.SchDoc
AMP022 Headphone Amp & Volume
Contact Engineer:
L297CT
06/01/2020
INITIALS
Printed:
4 10Sheet of
Notes:
Contact Tel: (01223) 203207Peter Kuell
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB25 9QR
Waterbeach
A3
ARCAM
HP OUT L
HP OUT L
HP OUT R
HP OUT R
0W063
R327
10K
HP MUTE*
HP MUTE*
D302
BAS21LT1
50V
NPO
C304
2N2
0W063
R301
100K
AGND
0W1
R302
1K 0.1%
0W1
R304
1K 0.1%
AGND
0W1
R306
1K 0.1%
0W1
R308
1K 0.1%
AGND
0W25
R303
1R0
0W25
R307
1R0
50V
NPO
C319
2N2
0W063
R310
100K
AGND
0W1
R311
1K 0.1%
0W1
R313
1K 0.1%
AGND
0W1
R316
1K 0.1%
0W1
R318
1K 0.1%
AGND
0W25
R312
1R0
0W25
R317
1R0
+9V
-9V
+9V
-9V
+9V
-9V
AGND
AGND
AGND
25V
C311
100UF
25V
C316
100UF
25V
C310
100UF
25V
C315
100UF
AMP LEFT
AMP RIGHT
50V
C313
100N
50V
C318
100N
50V
C312
100N
50V
C317
100N
0W125
R300
470R
0W125
R309
470R
TR300
BC846B
0W063
R325
4K7
2
3
1
84
IC300A
OPA1688ID
6
5
7
IC300B
OPA1688ID
2
3
1
84
IC302A
OPA1688ID
6
5
7
IC302B
OPA1688ID
+5V RLY
0W25
R305
33R
0W25
R314
33R
50V
NP0
C307
10N
50V
NP0
C321
10N
SHORT
+50V FS
0W125
R329
120K
TR302
MMUN2211LT1
OVER CURRENT DETECTION
PA SHORT*
100V
C322
100N
0W125
R323
10K
50V
C326
10UF
SHORT
+3V3 MCU
TR301
MMBTA56W
PA SHORT*
D305
BAV99
TR306
MMBTA92L
ERR -VE
ERR +VE
ERR +VE
ERR -VE
TR305
MMBTA42L
DC OFFSET
DC OFFSET DETECTION
+3V3 MCU
DGND
TR307
BC856B
50V
C327
100N
DC OFFSET
-9V
HEADPHONE AMP
HEADPHONE AMP DECOUPLING
VOUTR
11
DGND
5
AGNDR
10
VINR
9
SDO
7
AGNDL
15
VD+
4
VA+
12
VOUTL
14
SDI
3
ZCEN
1
CS
2
SCLK
6
MUTE
8
VINL
16
VA-
13
IC301
PGA2311UA
AGND
VOL MUTE*
VOL MUTE*
0W063
R319
47R
0W063
R320
47R
0W063
R322
47R
50V
C325
100P
50V
C324
100P
50V
C323
100P
DGND
VOL CS*
VOL SCLK
VOL MOSI
VOL CS*
VOL SCLK
VOL MOSI
-5VA
+5VA +5VD
DGND
AMP LEFT
AMP RIGHT
AMP LEFT
AMP RIGHT
PRE L
PRE R
500mA
L300
600R@100MHz
+5VD
AGND
AGND
50V
C300
10UF
50V
C305
10UF
-5VA
+5VA
AGND
50V
C301
10UF
+5VD
DGND
0W063
R333
10K
PRE MUTE*
PRE MUTE*
D304
BAS21LT1
TR304
BC846B
0W063
R331
4K7
+5V RLY
DAC L
DAC L
DAC R
DAC R
0W063
R332
10K
AN SEL
AN SEL
D303
BAS21LT1
TR303
BC846B
0W063
R330
4K7
+5V RLY
VOL L
VOL R
AGND
D300
BAV99
D301
BAV99
50V
NPO
C308
100P
50V
NPO
C309
100P
+9V
-9V
+9V
-9V
AN BYP L
AN BYP L
AN BYP R
AN BYP R
VOLUME CONTROL DECOUPLING
VOLUME CONTROL
VOL L
VOL R
AGND
PRE L
PRE R
G6K-2F-TR DC5
RLY302A
OMRON
G6K-2F-TR DC5
RLY302B
OMRON
G6K-2F-TR DC5
RLY302C
OMRON
G6K-2F-TR DC5
RLY301A
OMRON
G6K-2F-TR DC5
RLY301B
OMRON
G6K-2F-TR DC5
RLY301C
OMRON
G6K-2F-TR DC5
RLY300A
OMRON
G6K-2F-TR DC5
RLY300B
OMRON
G6K-2F-TR DC5
RLY300C
OMRON
50V
C302
100N
50V
C303
100N
50V
C306
100N
0W063
R335
10K
0W063
R334
10K
0W063
R328
10K
0W063
R336
4K7
0W063
R337
4K7
AGND
AGND AGND
AGND
AGND
AGND
GND_DEC
GND_DEC
0W125
Thin Film
R315
470R
0W125
Thin Film
R321
470R
0W125
Thin Film
R324
470R
0W125
Thin Film
R326
470R
16V
C314
100UF
16V
C320
100UF
19_E016 PK 12/06/19 DV release C.0
P345
P348
P346
P344
P347
P350
P349
P351
P334
P335
P332
P336
P337
P340
P338
P342
P339
P341
P313
P318
P327
P314
P325
P319
P322
P320
P300
P302
P308
P301
P306
P303
P305
P304
P312
P321
P309P315
P310
P316
P307
P311
P317
P323 P324
P328
P333
P329
P330
P331
P326
P343
P352
P353
P354
P355
P356
19_E028 PK 12/06/19 LPP BoM release 1.0
19_E038 PK 12/11/19 None to this sheet 2.0
19_E041 PK 23/12/19 None to this sheet 3.0
20_E001 PK 06/01/20 PCB change only 4.0
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