1
2
3
4
5
6
7
8
D
LSIG 0V_SIG 0V_LS_L 0V_HF_L +49V
RSIG 0V_SIG 0V_LS_R 0V_HF_R +49V
SW100A 2PCO
L882C3
L882C3_3.2.SCH
INPUTVIPROT
0V_SIGDCPROT
0V_LSOUTPUT
0V_HF
VPOS
VNEG
L882C4
L882C4_3.2.SCH
INPUTVIPROT
0V_SIGDCPROT
0V_LSOUTPUT
0V_HF
VPOS
VNEG
VIPROT_L
DCPROT_L
LS L
VIPROT_R
DCPROT_R
LS R
0V_D
0V_PSU
STANDBY
VIPROT_L
VIPROT_R
0V_TRIG
DCPROT_L
DCPROT_R
LS L
L882C2
L882C2_3.2.SCH
0V_D+5V(D)
0V_PSUVPOS
PWRONVNEG VIPROT_L THPROT_uC VIPROT_R VIPROT_uC
0V_TRIG AC_PRES DCPROT_L DCPROT_uC
DCPROT_R RC5 IN TRG IN
+5V_D
+49V
THERMPROT
VIPROT
AC PRESENT
DCPROT
REMOTE
TRIGGER
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0V_TRIG |
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| 6 | 0V_HF_R | |
| TP121 | ||||||||
0V_D | 1 |
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0V_HF_L |
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| 7 | 0V_LS_L | |
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| SP100 |
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+49V
D
C
1 | 2 | 3 | TP101 | L SIG |
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PL100 |
| R SIG |
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2 1 | SK104B | TP102 |
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SK102 | 1 | SK104A |
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SK106
1
2
0V_LS_L3
4
LS R | AMPCT4 |
D100 
1N4003F
RLY100C RLY
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| D101 |
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| 1N4003F |
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C
FROM PREAMP
1 | F | TP100 | F |
2 |
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3 | N EMC |
| N |
4 | C100 0V_SIG | ||
AMPCT4 |
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| 1N0 SM |
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PHONO4G | PL101 | PHONO4G |
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0V_SIG |
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0V_SIG | 2 1 |
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| SK107 | TR100 |
| TP118 |
| R103 | BD179 | ||
L | 5 |
| 1 |
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| 330R 1W CF | 2 |
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SK105 |
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2 |
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LHC |
| TP119 | R104 |
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3 |
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RHC |
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1 | TP120 |
| 330R 1W CF |
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HPSKT |
| AMPCT4 |
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6 |
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R | 7 |
| 100R 1W CF 100R 1W CF |
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TR101
BD179
R107
220R SM
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| 100R SM |
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| R102 | SPKR2 ON | |
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| 100R SM |
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R108
220R SM
B
A
SW100B | 4 | 5 | 6 |
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2PCO |
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INTEGRATED / PRE-POWER
MODE SELECT SWITCH
+5V_D
SK103 | R100 | +49V |
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1 | 10R MF |
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2 |
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3 |
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4 |
| STANDBY | TP103 |
5 |
| SPKR1 ON | TP104 |
6 |
| SPKR2 ON | TP105 |
7 |
| THERMPROT | TP106 |
8 |
| VIPROT | TP107 |
9 |
| DCPROT | TP108 |
10 |
| AC PRESENT | TP109 |
11 |
| TRIGGER | TP110 |
12 |
| REMOTE | TP117 |
13 |
| 0V_D |
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14 |
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FFC 14W 2.54MM VER |
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8K7014 |
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LS L | RLY100A | SK100A | RLY101A | SK100B | |
Top+ | Bot+ | ||||
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TP111 |
| TP113 |
| TP115 | |
| RLY | RLY | |||
0V_LS_L |
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| Top- |
| Bot- | |
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| CAMCON_G |
| CAMCON_G | |
LS R | RLY100B | SK101A | RLY101B | SK101B | |
Top+ | Bot+ | ||||
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TP112 | TP114 | TP116 | |||
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| RLY |
| RLY |
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0V_LS_R |
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| Top- |
| Bot- | |
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| CAMCON_G |
| CAMCON_G |
DRAWING TITLE
A85 amplifier and PSU - top sheet
Circuit Diagram
0V_D
PCB |
PCB |
L882PB_3 |
EL
EARTH LEAD 8M101
EARTH LEAD
01_1101 | JR | 6/4/01 | POWER SUPPLY FUSES AND DC OFFSET | 3.2 |
00_1134 | MGM | 17/11/00 | NO CHANGE TO THIS SHEET | 2.4 |
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00_1138 | JR | 27/11/00 | NO CHANGE TO THIS SHEET | 2.3 |
00_1129 | JR | 1/11/00 | NO CHANGE TO THIS SHEET | 2.2 |
B
A
1 | 2 | 3 |
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23425 | Notes: | ||
A & R Cambridge Ltd. |
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Pembroke Avenue |
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Denny Industrial Centre |
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Waterbeach | Filename | ||
Cambridge CB5 9PB | |||
L882C1_3.2.PRJ | |||
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4 |
| 5 | |
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00_1115 | JR | 16/10/00 | NO CHANGE TO THIS SHEET |
| 2.1 | ||||
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00_1086 | JR | 19/9/00 | NO CHANGE TO THIS SHEET |
| 2.0 | ||||
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| ECO No. | INITIALS | DATE |
| DESCRIPTION OF CHANGE | ISSUE | |||
| Date Printed |
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| Drawn by: | Sheet 1 of 4 | DRAWING NO. | L882C1 | |
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| J Reckless | ||||||
6 |
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