Page 1
LASeriespoweramplifiers
1.LA601/901/1201Preamp
2.LA601Powersupply
3.LA901/1201Powersupply
4.LA601Outputstage
5.LA901Outputstage
6.LA1201Outputstage
Schematicset
Note:Theimagesinthisschematicsetareformattedforprintingon11"X17"tabloidsizepaper.Theschematicset
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detailswillbeverysmall.
Page 2
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
Page 3
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
Page 4
8
7
6
5
4
3
2
1
R25
100/2W
D D
Z3
1N5355A
1N4148
IC1B
LM614
+
7
-
19.6K/1%
C C
1.5K
47/1W
1N4148
1.5K
R41
R39
R37
2N5401
R1
10K
Q3
D3
2.2K
R35
2N5551
Q1
R23 5K/5W
1N5920
Z5
470/25V
C18
R28
5
1K
6
R30
R32
1K/1%
D1
R15 10K
TR1
MAC97
R17
22K
1N4148
C14
470/25V
IC1C
LM614
R29
R31
1K/1%
10
1K
R33
19.6K/1%
-
11
+
12
R13
330K
IC1A
413
LM614
3
+
1
2
-
1N4148
CH. ACH. B
R12
1K
R9
10K
10/50V
D5
D6
R5
499/1%R6499/1%
9
13
R7
750/1%
C17
MPSA13
R27
100K
R4
2.2K
IC1E
LM614
8
750/1%
Q5
R8
IC2
LM317
2 3
D8
1N4148
D7
1N4004
R11
1K
R10
10K
R43
1
R26
1.5K/1W
26-48-1075
442/1%
R34
2.2K
R44
CH. A
CH. B
Z1
1N960
Z2
1N960
R21
2.2K
R22
2.2K
R40
47/1W
1N4148
1.5K
R38
D4
R2
10K
CH. ACH. B
1N4148
-
15
16
+
14
IC1D
LM614
R16 10K
R14
D10
330K
470/25V
C15
MAC97
TR2
R18
22K
2N5551
R24 5K/5W
C19
470/25V
Q2
R36
2.2K
1N5920
2N5401
Z4
Q4
1.5K/1W
R42
1.5K
26-48-1025
26-48-1075
26-48-1025
TEMP SENSOR POWER
1
TEMP SENSOR OUTPUT
2
GROUND
3
A CLIP-
4
A CLIP+
5
SPKR LEVEL A (DC PROT)
6
GROUND
7
J2
RELAY B
2
RELAY A
1
J4
J1
A CLIP-
8
A CLIP+
7
A CH. PROTECT+
6
A CH. POWER+
5
B CLIP-
4
B CLIP+
3
B CH. PROTECT+
2
B CH. POWER+
1
22-02-2085
TEMP SENSOR POWER
1
TEMP SENSOR OUTPUT
2
GROUND
3
B CLIP-
4
B CLIP+
5
SPKR LEVEL B (DC PROT)
6
GROUND
7
J3
FAN DRIVE V+
1
GROUND
2
J5
B B
0.15/400V
LA901 = 12 A.
LA1201 = 15 A.
12/15A
P1
PLUG AC MALE
SW1
C1
BR1
BR354W
C2
NOTE 1
C4
NOTE 1
C3
NOTE 1
C5
NOTE 1
C6
NOTE 1
C7
NOTE 1
+
+
GND
GND
GND
GND
-
-
120 VOLT VERSION
A A
T1
3A/MINI
F1
BR2
RS202
C11
1000/25V
NOTE 1
C2 - C5 ARE 7,300uF/80V ON MODEL LA901. C6, C7 ARE NOT USED.
C2 - C7 ARE 6,800uF/90V ON MODEL LA1201.
CREST AUDIO INC.
150 Florence Ave.
Hawthorne, NJ 07506
Title
LA901/1201 POWER SUPPLY/FAN DRIVER PCB
Size Document Number Rev
21C1127
C
8
7
6
5
4
3
Date: Sheet of
2
1 1Tuesday, May 16, 2000
1
Page 5
8
7
6
5
4
3
2
1
D1 1N4004
Z1
1N4735A
D D
Z2
1N4749A
1n/50V
R47
20K
C7
R46
10K
Q1
2N5551
1N4148
C1
100/6.3V
D9
1N4148
C2
0.1/100V
R1
NOT USED
10n/50V
D3
C9
Q4
2SC2336
10/1W
R8
R3
470
Q6
2SC3281
R12
2.2/1W
Q8
2SC3281
R19
2.2/1W
Q10
2SC3281
D5
FR204
C3
0.1/100V
+65VNL
+ 65 VNL
+ DRIVE
+ DRIVE
SPEAKER RAIL
SPEAKER RAIL
C C
- DRIVE
- DRIVE
- 65 VNL
J1
INPUT
8
7
6
5
4
3
2
1
D10
1N4148
PTC15LB/250
VR1
R5
1.2K
R6
390
Q3
TIP110
D4
100/1W
R7
Q5
2SA1006
150/1W
150/1W
R9
10/1W
R11
R10
R14
51/2W
R13
2.2/1W
Q7
2SA1302
R15
4.7/2W
R16
4.7/2W
R17
0.33/5W
R18
0.33/5W
R20
2.2/1W
Q9
2SA1302
1N4148
Q2
2N5401
Z3
B B
1N4749A
Z4
1N4735A
R48
20K
C6
R49
10K
1n/50V
R2
NOT USED
10n/50V
C8
R4
470
R21
0.33/5W
R22
0.33/5W
Q11
2SA1302
R37
255/1%
R23
100K
100K
R35
15K
R39
R41
100/1%
Q17
2N5551
Q19
2N5401
R24
15K
R25
100K
Q12
2N5551
D8
1N4004
Q13
2N5551
R26
220
D6
FR204
L1 2uH
R100 1/2W
C4
0.1/100V
2.2/2W
0.047/630V
OUT
R28
C5
GROUND
-65VNL
D2 1N4004
IC2
32
1
TEMP SENSOR POWER
TEMP SENSOR OUTPUT
TEMP SENSOR GROUND
CLIP (-)
SPEAKER RAIL
JP?
1
2
3
4
5
LM35DP
R29
1K
HEADER 5
A A
8
7
4/14/92 R37 changed from 274/1% to 255/1%
6
CREST AUDIO INC.
150 Florence Ave.
Hawthorne, NJ 07506
Title
LA601 OUTPUT STAGE
Size Document Number Rev
21B1157
B
5
4
3
Date: Sheet of
2
1 1Thursday, May 18, 2000
1
01
Page 6
8
D D
7
6
5
4
3
2
1
D1 1N4004
2N5551
C2
2N5401
R61
NOT USED
R63
470
C11
0.01/50V
Q28
D7
1N4148
341
2
9
785
IC1
LA2500
Q29
1N4148
0.01/50V
R62
6
100/1W
D8
C10
R3
Q2
2SC2336BQ
R6
10/1W
150/1W
150/1W
R7
10/1W
Q3
2SA1006BQ
Q4
2SC3281
R11
2.2/1W
R4
R8
R5
51/2W
R12
2.2/1W
Q5
2SA1302
R9
30/2W
R10
30/2W
Q6
2SC3281
R25
0.33/5W
R26
0.33/5W
Q7
2SA1302
R15
2.2/1W
R16
2.2/1W
Q10
2SC3281
R29
0.33/5W
R30
0.33/5W
R18
2.2/1W
Q11
2SA1302
R17
2.2/1W
Q12
2SC3281
R31
0.33/5W
R32
0.33/5W
Q13
2SA1302
R23
2.2/1W
R24
2.2/1W
Q18
2SC3281
R37
0.33/5W
R38
0.33/5W
Q19
2SA1302
R64
470
R45
15K
R39 100K
R41
150/1%
R42
150/1%
R40 100K
R46
15K
R43
100/1%
R44
100/1%
2N5551
2N5401
R47
100K
R48
100K
Q23
Q22
R49
15K
C7
0.1/100V
R59
1/5W
0.047/630V
C6
0.1/100V
L1
2uH
R60
2/5W
C5
Q20
2N5551
Q21
2N5401
D5
Q26
2N5401
R55 220
D3
1N4004
D4
1N4004
FR204
Q24
2N5401
R53
270K
R54 220
Q27
2N5551
Q25
2N5551
R50
15K
FR204
D6
+ 75 V.
GROUND
OUT
- 75 V.
NOT USED
Z1
1N5925A
Z2
1N5941A
0.001/50V
C1
C C
8
7
6
5
4
3
2
1
J1
INPUT
100/6.3V
1N4148
D10
1N4148
D9
0.001/50V
Z3
1N5941A
B B
Z4
1N5925A
R66
20K
2SC3068
PTC15LB/100
C8
R67
20K
16K
C9
0.1/100V
R1
680
Q1
R2
620
VR1
R68
16K
R65
D2 1N4004
IC2
32
1
LM35DP
R56
1K
TEMP/CLIP
J2
1
2
3
4
5
6
7
TEMP SENSOR POWER
TEMP SENSOR OUT
POWER SUPPLY GROUND
POWER SUPPLY GROUND
A A
OUTPUT SIGNAL
CLIP CLIP +
CREST AUDIO INC.
150 Florence Ave.
Hawthorne, NJ 07506
Title
LA901 OUTPUT STAGE
Size Document Number Rev
21C1240
C
8
7
6
5
4
3
Date: Sheet of
2
1 1Tuesday, May 16, 2000
1
1
Page 7
8
D D
7
6
5
4
3
2
1
D1 1N4004
Z1
1N5925A
Z2
1N5941A
0.001/50V
22K
R66
18K
C9
2N5551
R65
C1
100uF/6.3V
C C
INPUT
8
7
6
5
4
3
2
1
J1
1N4148
1N4148
D9
2SC3068
D10
PTC15LB/100
C8
0.001/50
C2
0.1uF/100V
R1
680
Q1
R2
620
VR1
Q29
2N5401
R67
Z3
1N5941A
B B
Z4
1N5925A
18K
R68
22K
Q28
1N4148
2
9
IC1
LA2500
D7
341
785
R61
NOT USED
0.01/50V
1N4148
0.01/50V
R62
NOT USED
C11
6
100/1W
D8
C10
R3
Q2
2SC2336BQ
R6
10/1W
150/1W
150/1W
R7
10/1W
Q3
2SA1006BQ
R63
470
Q22
2N5401
R45
15K
R47
R43
100/1%
R44
100/1%
100K
Q4
2SC3281
R11
2.2/1W
R4
R8
R5
51/2W
R9
30/2W
R10
30/2W
Q6
2SC3281
R25
0.33/5W
R26
0.33/5W
R15
2.2/1W
Q10
2SC3281
R29
0.33/5W
R30
0.33/5W
R17
2.2/1W
Q12
2SC3281
R31
0.33/5W
R32
0.33/5W
R19
2.2/1W
Q14
2SC3281
R33
0.33/5W
R34
0.33/5W
R21
2.2/1W
Q16
2SC3281
R35
0.33/5W
R36
0.33/5W
R23
2.2/1W
Q18
2SC3281
R37
0.33/5W
R38
0.33/5W
R39 100K
R41
100/1%
R42
2.2/1W
Q5
2SA1302
R16
Q7
2SA1302
2.2/1W
R12
Q11
2SA1302
R18
2.2/1W
Q13
2SA1302
R20
2.2/1W
Q15
2SA1302
R22
2.2/1W
Q17
2SA1302
R24
2.2/1W
Q19
2SA1302
100/1%
R40 100K
100K
R48
R46
Q23
15K
2N5551
Q20
2N5551
Q21
2N5401
R49
15K
Q24
2N5401
R53
270K
Q26
2N5401
R55 220
D3
1N4004
D4
1N4004
FR204
D5
C7
0.1/100V
1/5W
L1
2uH
R59
R60
2/5W
R54 220
Q27
2N5551
Q25
2N5551
R50
15K
FR204
D6
0.047/630V
C6
0.1/100V
C5
+ 85 V.
GROUND
OUT
- 85 V.
R64
470
D2 1N4004
J2
1
2
3
4
5
6
7
CLIP/TEMP
A A
IC2
32
1
LM35DP
R56
1K
CREST AUDIO INC.
150 Florence Ave.
Hawthorne, NJ 07506
Title
LA1201
Size Document Number Rev
21C1159
C
8
7
6
5
4
3
Date: Sheet of
2
1 1Thursday, May 18, 2000
1
1
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