Crest Audio LA Schematic
LASeriespoweramplifiers
1.LA601/901/1201Preamp
2.LA601Powersupply
3.LA901/1201Powersupply
4.LA601Outputstage
5.LA901Outputstage
6.LA1201Outputstage
Schematicset
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detailswillbeverysmall.
8
7
6
5
4
3
2
1
R7
1N5933
Z1
(22V)
R24
D1
C1 0.1/100V
D D
CH A OCTAL
J3
1
2
3
4
5
6
7
8
J1
CH A
R23
10K/1%
R22
10K/1%
R3
NOTE 1
D3
1N4148
R21
NOTE 2:
1N4148
D5
1N4148
D7
1N4148
C3
30pF
C2
0.1/100V
1
2
BAR1
3
4
5
6
Z3
1N5359
C C
INPUT BARRIER
NOTE 2
C5 30pF
-
2
+
3
8 4
1
IC1A
OPA2604
Z2
1N5933
(22V)
R6
100K
VR1
5K
90.9K/1%
C8
0.1/100V
1/63V
C12
330pF
R2
C22
R10 470
15
14
IC2B
STK3152
C10 15pF
NOTE 4
R12
6.65K/1%
C14
10/16V/BP
13121011
+
-
R8
C24
150pF
R17 100 C20
R18 100
C15
100/100V
C16
100/100V
R9 470
C23
D8
1N4148
1
2
B B
3
4
5
6
7
8
SW1
MSSA2350
R26
10K/1%
R27
10K/1%
D4
1N4148
D2
1N4148
D6
1N4148
C6 30pF
R25
NOTE 2
-
6
+
5
7
IC1B
OPA2604
C21
330pF
IC2A
STK3152
349
1
+
2
-
8
150pF
65
7
J4
CH B OCTAL
J2
CH B
NOTE 1:
NOTE 2:
A A
LA601 = 13.3K/1%
LA901 = 12.7K/1%
LA1201 = 12.4K/1%
LA601 = 30.1K/1%
LA901 = 36.5K/1%
LA1201 = 40.2K/1%
R4
NOTE 1
NOTE 3: LA601 = 680/10W
NOTE 4: LA601 = 1.5K/2W
R28
NOTE 2
LA901 = 820/10W
LA1201 = 1K/10W
LA901 = 2.7K/2W
LA1201 = 3.3K/2W
C4
30pF
VR2
5K
90.9K/1%
C7
0.1/100V
R1
R5
100K
R11
6.65K/1%
C13
1/63V
C9
15pF
R16 100
C11
10/16V/BP
R13 100K/1W/2%
NOTE 4
330pF
100K/1W/2%
R19 4.7/1W
0.1/100V
0.1/100V
C19
330pF
R15
100
VTL5C6
R14
C17
C18
R20
4.7/1W
0C2
NOTE 3
VTL5C6
R29
0C1
R32
100
R31
100
R30
NOTE 3
CREST AUDIO INC.
1
2
3
4
5
6
7
8
J8
CH A MODULE
T90N5D12-12
J9
1
2
RELAY
RLY2
T90N5D12-12
J10
1
2
3
4
LIMITER
J7
CH B MODULE
1
2
3
4
5
6
7
8
1
2
3
4
5
6
BAR2
OUTPUT BARRIER
CH A OUT
CH A MODULE
RLY1
CH B OUT
CH B MODULE
SUPPLY GND
SUPPLY GND
150 Florence Avenue
Hawthorne, NJ 07506
Title
PREAMP/DRIVER FOR LA SERIES
Size Document Number Rev
21B1113-04
B
8
7
6
5
4
3
Date: Sheet of
2
1 1Tuesday, May 16, 2000
1
8
7
6
5
4
3
2
1
R36
100/2W
D10
C10
R10
R46
D D
1.2K
D11
1N4148
LM393N
7
IC3B
5
+
6
-
19.8K/1%
R44
1K
Z5
R38
R40
1K/1%
1N960
2.2K
R47
1.2K
IC3A
R45
1K
R41
1K/1%
84
3
+
1
2
-
LM393N
R39
19.8K/1%
1N5353
Z8
D12
1N4148
10/50V
100K
Q5
MPSA13
R42
2.2K
1N4148
D9
R19
2.2K
1N4004
23
J5
IC2
1
LM317T
R37
442/1%
R43
Z6
1N960
C11
0.1/100V
1
2
26-48-1025
FAN +
FAN GND
GROUND
GROUND
-
+
22-15-4087
11
12
J4
TEMP SENSOR POWER
26-48-1055
1
2
3
4
5
J2
TEMP SENSOR OUTPUT
GROUND
B CLIPSPKR LEVEL B (DC PROTECT)
1
2
3
4
5
6
7
8
R32
R33
1K
R34
1K
1K/1W
26-48-1025
J3
1
RELAY A
2
RELAY B
Z1
R16
2.2K
IC1E
9
LM614
499/1%
R14
R12
1K
13
R17
499/1%
R21
1K
8
Z2
1N5353B
6
5
IC1B
LM614
-
+
1N5353B
D4
1N4148
7
R23
15K
4.7K/2W
R25
MAC97
1K/1W
R26
R27
5.6K
Q3
2N5551
200/2W
2N5401
R28
Q4
1N4148
D6
R29
10K
IC1A
413
LM614
3
+
2
-
R30
1.5K/1W
1
TR2
R13
R15
1K/1%
1K
R18
1K/1%
R20
1K
R22
330K
470/25V
C7
R24
10K
C8
470/25V
Z7
1N5920
D5
1N4004
SPKR LEVEL A (DC PROTECT)
TEMP SENSOR OUTPUT
TEMP SENSOR POWER
C C
A CLIP-
GROUND
TO CH.A MODULE TO CH.B MODULE
26-48-1055
5
4
3
2
1
J1
B CH. POWER+
B CH. PROTECT+
A CH. POWER+
A CH. PROTECT+
B CLIP-
A CLIP-
R31
1K/1W
R35
180/5W
R1
1.5K/1W
D1
1N4148
R3
200/2W
R4
5.6K
R5
1K/1W
2N5401
IC1D
LM614
14
+
16
B B
R2
15
-
10K
Q1
D2
1N4004
2N5551
Z4
1N5920
470/25V
R7
4.7K/2W
D3
1N4148
Q2
R9
TR1
MAC97
C5
15K
R8
10K
CH. A CH. B
IC1C
LM614
10
R11
330K
C6
470/25V
D7 1N4004
R6
50/10W
C4
220/80V
SW1
12A
D8 1N4004
0.15/400V
C1
BR354W
+
+
BR1
C2
10,000/67V
GND
GND
GND
C3
10,000/67V
GND
-
P1
PLUG AC MALE
-
CHASSIS COMPONENTS
3A/MINI
F1
BR2
RS202
5
C9
1000/25V
CREST AUDIO INC.
150 Florence Ave.
Hawthorne NJ 07506
Title
LA601 POWER SUPPLY PCB SCHEMATIC
Size Document Number Rev
21C1101
C
4
3
Date: Sheet of
2
1 1Thursday, May 18, 2000
1
04
A A
T1
120 VOLT VERSION
8
7
6
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