ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No.
DESCRIPTION OF CHANGE
L943C4_5.1.SCH
A80/P80 - Power Amp Left
Contact Engineer:
L943C4
9-Sep-2003
INITIALS
Printed:
4
8
Sheet
of
Notes:
Contact Tel:
(01223) 203 200
Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
0V_FB_L
PRE_OUT_L
0V_HF_L
0V_LS_L
0V_HF_L
VIPROT_L
OUTPUT_L
0V_LS_L
0V_HF_L
+45V_L
-45V_L
0V_HF_L
0V_HF_L
BIAS
MEASURE BIAS
INPUT FILTER
V TO I AMP
INTEGRATING DC SERVO
PNP CURRENT MIRROR
NPN CURRENT MIRROR
PRE DRIVER
PRE DRIVER
OUTPUT STAGE
V-I PROTECTION
V-I PROTECTION
VI PROTECT
SIGNAL TO MICRO
ZOBEL NETWORK
BOOT
ST
R
A
P
BOOT
ST
R
A
P
DZ404
BZX84C
15V
SOT-23
C410
100UF
25V
YK
TR408
FMMT497
SOT-23
C417
100N
50V
0805
C416
470P
100V
FKP2
C419
100N
50V
0805
C420
100N
50V
0805
C422
470N
100V
MKS2
C402
100P
100V
0805
C414
100UF
25V
YK
C425
10UF
50V
YK
C423
100UF
100V
YK
C405
10N
100V
0805
C424
100UF
100V
YK
C412
100UF
25V
YK
C413
100UF
25V
YK
C426
10UF
50V
YK
C427
100N
100V
MKS2
C421
100N
50V
0805
R422
100R
0W125
0805
R427
100R
0W125
0805
R424
100R
0W125
0805
R443
4K7
0W125
0805
R420
1M0
0W125
0805
TR407
FMMT497
SOT-23
TR402
FMMT597
SOT-23
R431
22R
0W125
0805
R410
1K0
0W125
0805
R402
22K
0W125
0805
2
3
1
8
4
IC400A
TL072CD
SO-8
6
5
7
IC400B
TL072CD
SO-8
TR404
FMMT597
SOT-23
DZ405
BZX84C
15V
SOT-23
TR411
FMMT497
SOT-23
R434
22R
0W125
0805
TR405
FMMT597
SOT-23
D401
BAS16
SOT-323
R411
1K0
0W125
0805
R454
100K
0W125
0805
R456
330R
0W125
0805
R425
100R
0W125
0805
D402
BAS16
SOT-323
TR409
FMMT497
SOT-23
TR406
FMMT597
SOT-23
TR410
FMMT497
SOT-23
TR403
FMMT597
SOT-23
R414
1K0
0W125
0805
1
2
CON401
HARWIN
M20-973
R457
330R
0W125
0805
R429
100R
0W125
0805
R430
100R
0W125
0805
D403
BAS16
SOT-323
D406
1N4003
DO-41
D407
1N4003
DO-41
R459
5R6
2W
CF
R436
10K
0W125
0805
R442
4K7
0W125
0805
R426
100R
0W125
0805
DZ400
BZX84C
22V
SOT-23
DZ401
BZX84C
22V
SOT-23
R441
10K
0W125
0805
R438
10K
0W125
0805
TR416
BC849B
SOT-23
TR417
BC849B
SOT-23
TR400
BC859B
SOT-23
TR401
BC859B
SOT-23
SHEET
3
R406
47R
0W125
0805
R407
47R
0W125
0805
R405
47R
0W125
0805
R408
47R
0W125
0805
R416
220R
0W25
MF
R415
220R
0W25
MF
R445
22R
0W25
MF
R446
22R
0W25
MF
R432
22R
0W125
0805
R435
22R
0W125
0805
R452
1K0
1W
CF
R453
1K0
1W
CF
D404
BAS16
SOT-323
D400
BAS16
SOT-323
C408
22UF
63V
YK
C409
22UF
63V
YK
0V_HF_L
0V_HF_L
C403
100P
100V
0805
RV400
220R
LIN
DZ406
BZX84C
3V9
SOT-23
0V_FB_L
0V_FB_L
0V_FB_L
NF
PRE DRIVER BIAS
& TEMP. COMP.
->
NF
R444
10K
0W125
0805
C400
47P
100V
0805
R413
1K0
0W125
0805
0V_HF_L
R400
22K
0W125
0805
R404
22K
0W125
0805
R401
10K
0W125
0805
C407
10N
100V
0805
C404
10N
100V
0805
R433
22R
0W125
0805
C411
100UF
25V
YK
C406
10N
100V
0805
* - Default jumper setting on pins 2 & 3; fit jumper
~1.6V
NF
C401
47P
100V
0805
R403
10K
0W125 0805
C415
100UF
25V
YK
remove jumper to decrease bias voltage
on pins 1 & 2 to increase bias voltage;
Q403
Q409
D405
1N4003
DO-41
D408
1N4003
DO-41
0V_FB_L
0V_FB_L
ADJUST
TR413
SAP15NY
SAP
TR415
SAP15PY
SAP
ITEM400
1
Con Jumper Socket 0.1IN Gold Blue
8K004
TR414A
ZDT758
SM-8
TR414B
ZDT758
SM-8
TR412A
ZDT6758
SM-8
TR412B
ZDT6758
SM-8
R449
820R
0W25
MF
R450
820R
0W25
MF
R447
820R
0W25
MF
R448
820R
0W25
MF
R409
1K0
0W125
0805
R412
1K0
0W125
0805
NF
NF
ANNOTATION
REF400
LM431AIM3
SOT-23
DZ402
BZX84C
3V9
SOT-23
DZ403
BZX84C
3V9
SOT-23
R419
470K
0W125
0805
R421
470K
0W125
0805
D409
BAV99
SOT-23
NF
R451
18K
0W25 MF
R458
18K
0W25 MF
P401
P402
P404
P405
P420
P407
P409
P408
P410
P411
P427
P429
P430
P431
P432
P413
P414
P415
P440
P449
P451
P452
P433
P454
P456
P438
P439
P442
P458
P459
P444
R423
220R
0W25
MF
R428
220R
0W25
MF
0V_FB_L
0V_FB_L
0V_FB_L
0V_FB_L
OUT_L
R417
1K0
0W125
0805
R418
1K0
0W125
0805
R460
330R
0W125
0805
R440
4K7
0W125 0805
R439
22K
0W125
0805
1
2
3
CON400
HARWIN
M20-973
*
P403
P406
P400
NF
NF
03_E116
TGP
NO CHANGE TO THIS SHEET
2.1
17 APR 03
03_E120
TGP
13 May 03
LEDs, BIAS & DOCUMENTATION CHANGE
3.0
R437
5K6
0W125
0805
03_E147
MJT
23 May 03
None to this sheet. PCB change.
4.0
03_E230
MJT
04 Aug 03
None to this sheet. Display snapoff fixing holes reduced to 3.2mm
5.0
A80
03_E264
MJT
09 Sept 03
None to this sheet. Remove EMC can from around IEC inlet.
5.1