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ISSUE
DRAWING NO.
23425
DRAWING TITLE
Drawn by:
DATE
Filename
ECO No. DESCRIPTION OF CHANGE
L911C2_1.1.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB
AP85 third channel - output stage
Circuit Diagram
L911C2
J Reckless4-Jun-2001
INITIALS
Date Printed
2 2Sheet of
Notes:
R324
1K0 SM
TR300
FMMT597
TR301
FMMT597
R315
100R SM
R316
100R SM
R319
100R SM
TR314
FMMT497
TR315
FMMT497
R317
100R SM
R318
100R SM
R320
100R SM
R322
22R SM
0V_SIG
C317
470N PE
0V_SIG
0V_SIG
INPUT
0V_SIG
R350
5R6 2W CF
C319
100N PE
0V_HF 0V_LS
C313
100N SM
R341
330R SM
R342
330R SM
R343
100R SM
R344
100R SM
R345
0R0 SM
R346
0R0 SM
R334
22K SM
R336
22K SM
D301
BAS16W SM
D302
BAS16W SM
TR312
FMMT497
TR304
FMMT597
TR313
FMMT497
TR302
FMMT597
DZ305
4V7 350MW SM
0V_HF
VIPROT
C320
100U NP
TR305
FMMT597
DZ306
4V7 350MW SM
0V_HF
DCPROT
OUTPUT
0V_LS
0V_HF
VPOS
VNEG
0V_HF
0V_HF
DZ300
15V 350MW SM
DZ301
15V 350MW SM
C309
100N SM
C310
100N SM
C314
100N SM
0V_SIG
0V_SIG
D304
1N4003F
D303
1N4003F
R302
10K SM
R327
22K SM
RV300
100R PSET
C312
10N SM
1
2
PL300
BIAS
R325
1K0 SM
R326
1K0 SM
ADJ BIAS
D300
BAS16W SM
R300
10K SM
R309
10K SM
R305
10K SM
R306
10K SM
+
C305
10U EL
MEASURE
TR318
SAP15N
TR319
SAP15P
R301
10K SM
C315
100N SM
R347
100R SM
R349
100R SM
R348
100R SM
R340
100K SM
DZ302
4V7 350MW SM
DZ303
4V7 350MW SM
3
2
1
84
IC300A
TL072CD
5
6
7
IC300B
TL072CD
R328
4K7 SM
0V_HF
0V_SIG
TR311
FMMT497
TR303
FMMT597
TR310
FMMT497
TR307
FMMT597
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
TR316
FMMT497
TR308
FMMT597
TR317
FMMT497
R311
10K SM
R312
10K SM
R313
10K SM
R303
10K SM
R304
10K SM
R307
10K SM
R310
4K7 SM
R329
4K7 SM
+
C300
100U EL
+
C301
100U EL
R338
150R SM
R339
150R SM
R308
22K SM
R314
10K SM
TR309
FMMT497
TR306
FMMT597
R323
22R SM
R321
22R SM
TP302
TP303
TP304
TP307
TP308
TP305
TP306
R337
22R SM
R331
1K5 SM
R332
1K8 SM
R330
1M0 SM
R333
3K3 SM
R335
3K3 SM
L300
2U2H LAC SMALL
C316
470P PPW
C311
100N PC
+
C318
10U EL
TR321
FMMT597
TR320
FMMT497
+
C302
100U EL 100V
+
C306
100U EL 100V
R352
470R 2W
R353
470R 2W
BOOTSTRAP
BOOTSTRAP
R351
5R6 2W CF
C307
100P SM
C308
100P SM
+
C303
100U EL
+
C304
100U EL
R354
1K0 SM
R355
6K8 SM
TR322
FMMT497
JR 30/1/01 PRODUCTION ISSUE 1.001_1018
01_1101 JR 4/6/01 DC OFFSET CHANGES 1.1