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1
2
D
R300
10K SM
TR300
FMMT597
+
C300
DZ300
100U EL
15V 350MW SM
0V_HF
C310
100N SM
0V_SIG
C
INPUT FILTER
V TO I AMP
R324
3
INPUT
1K0 SM
DZ302
2
4V7 350MW SM
R327
22K SM
DZ303
C316
4V7 350MW SM
470P PPW
0V_SIG
0V_SIG
C309
100N SM
0V_HF
C314
100N SM
0V_SIG
DZ301
15V 350MW SM
+
0V_HF
C301
100U EL
TR314
R309
FMMT497
10K SM
B
A
1
2
3
R319
100R SM
R315
R316
100R SM
100R SM
PRE DRIVER
PNP CURRENT MIRROR
TR310
TR301
FMMT497
FMMT597
R321
TR309
22R SM
FMMT497
TR321
FMMT597
R338
150R SM
C307
R333
3K3 SM
100P SM
TR311
FMMT497
C317
DC SERVO
BOOTSTRAP
470N PE
+ C302
100U EL 100V
R330
IC300B
6
ADJ BIAS
7
1M0 SM
5
RV300
R328
TL072CD
0V_SIG
100R PSET
4K7 SM
R352
470R 2W MF 5%
TP302
D300
R331
BAS16W SM
1K5 SM
0V_SIG
IC300A
TP304
R332
1
470R 2W MF 5%
1K8 SM
R353
TL072CD
R322
22R SM
R355
6K8 SM
TR322
+ C318
C312
FMMT497
10U EL
R337
10N SM
C311
22R SM
100N PC
+ C306
TP303
R354
100U EL 100V
1K0 SM
0V_SIG
TR303
BOOTSTRAP
FMMT597
C308
R335
3K3 SM
100P SM
R339
TR320
150R SM
FMMT497
TR306
R323
FMMT597
22R SM
TR315
FMMT497
TR307
FMMT597
NPN CURRENT MIRROR
PRE DRIVER
R317
R318
100R SM
100R SM
R320
100R SM
3
4
5
OUTPUT STAGE
V-I PROTECTION
D301
BAS16W SM
TR318
R334
SAP15N
22K SM
TP305
R341
TR312
R347
FMMT497
330R SM
100R SM
R325
R343
R345
1K0 SM
100R SM
0R0 SM
PL300
+ C303
R340
1
100U EL
100K SM
2
MEASURE
BIAS
(SET TO 16mV)
+ C304
100U EL
R326
R344
R346
1K0 SM
100R SM
0R0 SM
TR304
R348
FMMT597
TP306
R342
100R SM
330R SM
R336
TR319
22K SM
D302
SAP15P
BAS16W SM
OUTPUT STAGE
V-I PROTECTION
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
4
5
6
R301
10K SM
TR302
FMMT597
VI PROTECT
R329
R305
4K7 SM
10K SM
SIGNAL TO MICRO
TP307
R306
+ C305
D303
TR313
10K SM
10U EL
R349
1N4003F
FMMT497
100R SM
0V_HF
DC OFFSET SIGNAL
TO MICRO
DCPROT
R303
10K SM
TR305
DC OFFSET
FMMT597
DETECTION
R304
10K SM
D304
R308
1N4003F
R302
22K SM
10K SM
R307
10K SM
TP308
TR316
FMMT497
R310
R313
DZ306
C320
4K7 SM
4V7 350MW SM
100U NP
10K SM
C315
100N SM
0V_HF
TR308
FMMT597
R311
10K SM
TR317
FMMT497
R312
10K SM
DRAWING TITLE
A85 amplifier - power output stage left
Circuit Diagram
23425
Notes:
02_E062
JBR
02_E035
JBR
ECO No.
INITIALS
Filename
Date Printed
20-Mar-2002
L882C3_4.1.SCH
6
7
8
VPOS
D
VIPROT
DZ305
4V7 350MW SM
R351
C
10R MF
L300
OUTPUT
2U2H LAC SMALL
R350
5R6 2W CF
ZOBEL NETWORK
C319
100N PE
C313
0V_LS
100N SM
0V_HF
0V_LS
R314
10K SM
0V_HF
B
VNEG
A
20/3/02
LDO REG FITTED TO IC201
4.1
4/2/2002
FUSE VALUES UPRATED TO T4A
4.0
DATE
DESCRIPTION OF CHANGE
ISSUE
Drawn by:
Sheet
3
of
4
L882C3
J Reckless
DRAWING NO.
7
8
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