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Schematic set
LA Series power amplifiers
1. LA 601 / 901 / 1201 Preamp
2. LA 601 Power supply
3. LA 901 / 1201 Power supply
4. LA 601 Output stage
5. LA 901 Output stage
6. LA 1201 Output stage
Note: The images in this schematic set are formatted for printing on 11" X 17" tabloid size paper. The schematic set
can be printed on 8.5" X 11" paper by using the "Shrink to fit" option in Adobe Acrobat reader, however some of the
details will be very small.
8 7 6 5 4 3 2 1
R7
Z1 1N5933
(22V) NOTE 4
R10 470
R24
D1
NOTE 2 C24
C1 0.1/100V 1N4148 C22
150pF 1
330pF
2
3
13
12
10
R23 C5 30pF R17 100 C20 4
D D
1 330pF 5
2 15
10K/1% + 6
3 7
14 -
4 8
4
D3 D5 IC2B
5 0C1
1N4148 1N4148 2 -
STK3152 J8
11
6 R2
R22 1 90.9K/1% R31 CH A MODULE
7
3 +
8 IC1A
10K/1% 100 CH A OUT
J3 OPA2604 C8
D7 C10 15pF R18 100
8
CH A OCTAL 0.1/100V
1N4148
VTL5C6
R3 R8
R21 C3 CH A MODULE
NOTE 1 NOTE 2: 30pF NOTE 4
R14 RLY1
J1 Z2 T90N5D12-12
CH A 1N5933 100K/1W/2%
C2
0.1/100V (22V) J9
VR1 R12 R19 4.7/1W 1
5K 6.65K/1%
1 2
C17
2
3 0.1/100V RELAY
C15
C 4 100/100V CH B OUT C
5
6 R6
100K 0.1/100V
BAR1 Z3
INPUT BARRIER 1N5359 C12 C14 C18 CH B MODULE
C16
1/63V 10/16V/BP 100/100V R20
RLY2
4.7/1W T90N5D12-12
R9 470 SUPPLY GND
SUPPLY GND
C19
C23 330pF
150pF J10
D2 R15
D8 C21 1
1N4148 1N4148 330pF 100 2
3
C6 30pF 4
3
4
9
6
R26 R25 R32 LIMITER
1 100
1 + 0C2
2 10K/1% NOTE 2
3 2 -
B IC2A B
4 D4 D6 J7
6 -
STK3152
5 CH B MODULE
8
7
5
R27 1N4148 1N4148 7
6
7 5 +
1
SW1 MSSA2350
8 IC1B 2
10K/1% OPA2604 VTL5C6
3
J4 4
CH B OCTAL VR2 C9 R13 100K/1W/2% 5
R4 R28 C4
5K 6
NOTE 1 NOTE 2 30pF 15pF R16 100 7
R1 8
90.9K/1% R11
6.65K/1%
C7 R29
J2 0.1/100V 1
CH B NOTE 3 R30 2
NOTE 3 3
4
NOTE 1: LA601 = 13.3K/1% NOTE 3: LA601 = 680/10W 5
LA901 = 12.7K/1% LA901 = 820/10W 6
R5
LA1201 = 12.4K/1% LA1201 = 1K/10W C13 C11
100K BAR2
1/63V 10/16V/BP OUTPUT BARRIER
NOTE 2: LA601 = 30.1K/1% NOTE 4: LA601 = 1.5K/2W
LA901 = 36.5K/1% LA901 = 2.7K/2W
A A
LA1201 = 40.2K/1% LA1201 = 3.3K/2W CREST AUDIO INC.
150 Florence Avenue
Hawthorne, NJ 07506
Title
PREAMP/DRIVER FOR LA SERIES
Size Document Number Rev
B 21B1113-04
Date: Tuesday, May 16, 2000 Sheet 1 of 1
8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
R36
100/2W
D10
C10 1N4148 R19
R10 10/50V 2.2K
D9
2.2K
R46 R47
1.2K Z8
1.2K
1N5353 1N4004
D D
3 2
J5
Q5 IC2 1 FAN +
1
IC3B IC3A MPSA13 FAN GND
2
8
R45 LM317T
LM393N R44 D12
5 3 R42 R37 26-48-1025
+ +
7 1K 1
6 1K 2
- - 100K 442/1%
1N4148
Z5 LM393N R43 Z6 C11
D11 1N960 1N960 0.1/100V
4
1N4148 2.2K
R38 R40 R39
19.8K/1% 1K/1% R41
1K/1% 19.8K/1%
J4
TO CH.A MODULE 22-15-4087 TO CH.B MODULE
TEMP SENSOR POWER
5 B CH. POWER+ 1 1
SPKR LEVEL A (DC PROTECT) TEMP SENSOR OUTPUT
4 B CH. PROTECT+ 2 2
A CLIP- GROUND
3 GROUND 3 3
GROUND B CLIP-
2 B CLIP- 4 4
TEMP SENSOR OUTPUT SPKR LEVEL B (DC PROTECT)
1 A CH. POWER+ 5 5
TEMP SENSOR POWER
A CH. PROTECT+ 6
J1 GROUND J2
7
26-48-1055 A CLIP- 26-48-1055
8
C C
R31 R32
1K/1W 1K/1W
R33 R34
1K 1K
J3
26-48-1025
1 RELAY A
2 RELAY B
R35
180/5W
Z1
R1 D1 R3 R5 R7 R25 R26 R28 D6 R30
1.5K/1W 1N4148 1N5353B
200/2W 1K/1W 4.7K/2W R16 Z2 4.7K/2W 1K/1W 200/2W 1N4148 1.5K/1W
2.2K 1N5353B
R4 R27
5.6K 5.6K
CH. A CH. B D4
D3
2N5401 IC1E
9
1N4148 IC1C 1N4148
LM614 IC1B Q4
Q1 LM614 R12 R14 R17 R21 LM614
IC1D 2N5551 2N5401 IC1A
1K 499/1% 499/1% 1K R29
4
LM614 11 6 LM614
Q2
- - 10K
14 10 7 3
+ +
16 + 12 13 5 + 1
R2 R9 R23 Q3
8
15 2
- 10K TR1 15K 15K MAC97 2N5551 -
MAC97
13
Z4 TR2
B B
1N5920
D2 R11 R22 Z7 D5
1N4004 R20 330K 1N5920
R8 330K R13 R15 R18 1N4004
1K/1% 1K