Arcam A85 User Manual
Page 13
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ISSUE
DRAWING NO.
23425
DRAWING TITLE
Drawn by:
DATE
Filename
ECO No.
DESCRIPTION OF CHANGE
L882C4_3.2.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
A85 amplifier - power output stage right
Circuit Diagram
L882C4
J Reckless
6-Jun-2001
INITIALS
Date Printed
4
4
Sheet
of
Notes:
R424
1K0 SM
TR400
FMMT597
TR401
FMMT597
R415
100R SM
R416
100R SM
R419
100R SM
TR414
FMMT497
TR415
FMMT497
R417
100R SM
R418
100R SM
R420
100R SM
R422
22R SM
0V_SIG
R430
1M0 SM
R431
1K5 SM
R432
1K8 SM
C417
470N PE
0V_SIG
0V_SIG
INPUT
0V_SIG
R450
5R6 2W CF
C419
100N PE
0V_HF
0V_LS
C413
100N SM
R441
330R SM
R442
330R SM
R443
100R SM
R444
100R SM
R445
0R0 SM
R446
0R0 SM
R434
22K SM
R436
22K SM
D401
BAS16W SM
D402
BAS16W SM
TR412
FMMT497
TR404
FMMT597
TR413
FMMT497
TR402
FMMT597
DZ405
4V7 350MW SM
0V_HF
VIPROT
C420
100U NP
TR405
FMMT597
DZ406
4V7 350MW SM
0V_HF
DCPROT
OUTPUT
0V_LS
0V_HF
VPOS
VNEG
0V_HF
0V_HF
DZ400
15V 350MW SM
DZ401
15V 350MW SM
C409
100N SM
C410
100N SM
C414
100N SM
0V_SIG
0V_SIG
D404
1N4003F
D403
1N4003F
R402
10K SM
R427
22K SM
RV400
100R PSET
C412
10N SM
1
2
PL400
BIAS
R425
1K0 SM
R426
1K0 SM
ADJ BIAS
D400
BAS16W SM
R400
10K SM
R409
10K SM
R405
10K SM
R406
10K SM
+ C405
10U EL
MEASURE
TR418
SAP15N
TR419
SAP15P
R401
10K SM
C415
100N SM
R447
100R SM
R449
100R SM
R448
100R SM
R440
100K SM
DZ402
4V7 350MW SM
DZ403
4V7 350MW SM
3
2
1
8
4
IC400A
TL072CD
5
6
7
IC400B
TL072CD
R428
4K7 SM
0V_HF
0V_SIG
TR411
FMMT497
TR403
FMMT597
TR410
FMMT497
TR407
FMMT597
C407
100P SM
C408
100P SM
INPUT FILTER
V TO I AMP
DC SERVO
PNP CURRENT MIRROR
NPN CURRENT MIRROR
PRE DRIVER
PRE DRIVER
OUTPUT STAGE
OUTPUT STAGE
V-I PROTECTION
V-I PROTECTION
VI PROTECT
SIGNAL TO MICRO
DC OFFSET
DETECTION
DC OFFSET SIGNAL
TO MICRO
ZOBEL NETWORK
TR416
FMMT497
TR408
FMMT597
TR417
FMMT497
R411
10K SM
R412
10K SM
R413
10K SM
R403
10K SM
R404
10K SM
R407
10K SM
R410
4K7 SM
R429
4K7 SM
+
C400
100U EL
+
C401
100U EL
R438
150R SM
R439
150R SM
R408
22K SM
R414
10K SM
TR409
FMMT497
TR406
FMMT597
R423
22R SM
R421
22R SM
(SET TO 16 mV)
TP402
TP403
TP404
TP405
TP406
TP407
TP408
R437
22R SM
R433
3K3 SM
R435
3K3 SM
R451
10R MF
C416
470P PPW
C411
100N PC
+ C418
10U EL
TR421
FMMT597
TR420
FMMT497
+ C402
100U EL 100V
+ C406
100U EL 100V
R452
470R 2W MF 5%
R453
470R 2W MF 5%
BOOTSTRAP
BOOTSTRAP
00_1086
JR
19/9/00
NO CHANGE TO THIS SHEET
2.0
00_1115
JR
16/10/00
R438 R439 CHANGED TO 150R
00_1129
JR
1/11/00
R435 R436 C407 C408 VALUE CHANGES
2.1
2.2
+ C403
100U EL
+ C404
100U EL
00_1138
JR
27/11/00
C403 C404 FROM 10U TO 100U
2.3
L400
2U2H LAC SMALL
00_1134
MGM
17/11/00
L300 L400 CHANGED TO 7D002C
2.4
TR422
FMMT497
R454
1K0 SM
R455
6K8 SM
01_1101
JR
6/4/01
POWER SUPPLY FUSES AND DC OFFSET
3.2