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.
R7 Z1 1N5933 (22V) R24 C1 0.1/100V R8 J3 CH A OCTAL 10K/1% D3 1N4148 R22 10K/1% D7 1N4148 R3 NOTE 1 J1 CH A 0.1/100V BAR1 INPUT BARRIER Z3 1N5359 R21 NOTE 2: C3 30pF Z2 1N5933 (22V) VR1 5K R12 6.65K/1% C15 100/100V R6 100K C12 1/63V C14 10/16V/BP C16 100/100V 0.1/100V C18 R20 4.7/1W RC19 330pF RRLY2 T90N5D12-12 SUPPLY GND SUPPLY GND C23 150pF C21 330pF C6 R8 J4 CH B OCTAL R4 NOTE 1 R28 NOTE 2 10K/1% D4 1N4148 D6 1N5 R25 NOTE 2 30pF 1 RJ4 LIMITER 8 D5 1ND1 1N4148 NOTE 2 C22 330pF 30pF C24 150pF RNOTE 4

C20 330pF

1 + 3 IC1A OPA2604

R2 90.9K/1% C8 0.1/100V

D8 1N4148

R27 SW1 MSSA2350 10K/1%

7 + IC1B OPA2604

C4 30pF

J2 CH B

NOTE 1:

LA601 = 13.3K/1% LA901 = 12.7K/1% LA1201 = 12.4K/1% LA601 = 30.1K/1% LA901 = 36.5K/1% LA1201 = 40.2K/1%

NOTE 3:

LA601 = 680/10W LA901 = 820/10W LA1201 = 1K/10W LA601 = 1.5K/2W LA901 = 2.7K/2W LA1201 = 3.3K/2W

NOTE 2:

NOTE 4:

14 IC2B STK3152

0C1 RJ8 CH A MODULE CH A OUT

C10 R8

100 VTL5C6 CH A MODULE R14 100K/1W/2% R19 4.7/1W C17 0.1/100V RLY1 T90N5D12-12 J2 RELAY CH B OUT

NOTE 4

CH B MODULE

D2 1N4148

2 IC2A STK3152
J7 CH B MODULE VTL5C6 BAR2 OUTPUT BARRIER
VR2 5K R1 90.9K/1% C7 0.1/100V
C9 15pF R11 6.65K/1% R16 100

100K/1W/2%

R29 NOTE 3

R30 NOTE 3

R5 100K

C13 1/63V

C11 10/16V/BP
CREST AUDIO INC. 150 Florence Avenue Hawthorne, NJ 07506 Title PREAMP/DRIVER FOR LA SERIES Size B Date:
Document Number 21B1113-04 Tuesday, May 16, 2000

Rev Sheet 1

R36 100/2W D10 R10 2.2K C10 10/50V R47 1.2K Z8 1N1N4148 D9 1NJ5 IC3B LM393N 7 + D11 1N4148 19.8K/1% R1K Z5 1N960 R38 R40 1K/1% R41 1K/1% IC3A D12 + LM393N 4 R39 19.8K/1% 1 1N4148 R42 100K R43 2.2K Q5 MPSA13 IC2 LM317T R37 442/1% Z6 1N960 C11 0.1/100V FAN + FAN GND 1 R19 2.2K

R46 1.2K

R44 1K

26-48-1025

TO CH.A MODULE SPKR LEVEL A (DC PROTECT) A CLIPGROUND TEMP SENSOR OUTPUT TEMP SENSOR POWER 1 B CH. POWER+ B CH. PROTECT+ GROUND B CLIPA CH. POWER+ A CH. PROTECT+ GROUND A CLIP-

J4 22-15-8

TO CH.B MODULE 5 J2 26-48-1055
TEMP SENSOR POWER TEMP SENSOR OUTPUT GROUND B CLIPSPKR LEVEL B (DC PROTECT)

J1 26-48-1055

R31 1K/1W R33 1K R34 1K

R32 1K/1W

J3 26-48-2 RELAY A RELAY B
R35 180/5W R1 1.5K/1W D1 1N4148 R3 200/2W R5 1K/1W R7 4.7K/2W Z1 1N5353B R25 4.7K/2W R26 1K/1W R28 200/2W D6 1N4148 R30 1.5K/1W

R16 2.2K

Z2 1N5353B
R4 5.6K CH. A 2N5401 IC1D LM+ R2 10K Z4 1N5920 R8 10K Q1 2N5551 Q2 R9 15K 8 TR1 MAC97 D2 1N4004 + + D3 1N4148 IC1C LMIC1E LMCH. B IC1B LM7 R23 15K MAC97 TR2 R11 330K C6 470/25V R15 1K/1% R18 1K/1% R20 1K R22 330K C7 470/25V R24 10K C8 470/25V D4 1N4148

R27 5.6K

R12 1K

3 Q3 2N5551 2

CREST AUDIO INC. 150 Florence Ave. Hawthorne, NJ 07506 Title LA901/1201 POWER SUPPLY/FAN DRIVER PCB Size C Date:
Document Number 21C1127 Tuesday, May 16, 2000 Sheet

Rev 1 of 1

D1 Z1 1N4735A

R46 R47 10K

R1 NOT USED RC9 10n/50V +65VNL

Z2 1N4749A

20K C7 1n/50V Q1 2N5551

D3 1N4148

Q4 2SC2336 R8 10/1W
C1 100/6.3V D9 1N4148 C2 0.1/100V

Q6 2SC3281 R12 2.2/1W

Q8 2SC3281 R19 2.2/1W

Q10 2SC3281

D5 FR204

C3 0.1/100V

+ 65 VNL + DRIVE + DRIVE SPEAKER RAIL SPEAKER RAIL - DRIVE - DRIVE - 65 VNL

J1 INPUT

R5 1.2K

R10 150/1W

R15 4.7/2W

R17 0.33/5W

R21 0.33/5W L1 R100 2uH OUT 1/2W R28 2.2/2W

Q3 TIP110 R6 390

R7 100/1W

R11 150/1W

R14 51/2W

R16 4.7/2W

R18 0.33/5W

R22 0.33/5W R37

R41 100/1%

R25 100K

D8 1N4004 R26

D10 1N4148

R13 VR1 PTC15LB/250 R9 10/1W D4 1N4148 Q2 2N5401 Q5 2SA1006 2.2/1W Q7 2SA1302

R20 2.2/1W Q9 2SA1302

255/1% R23 100K Q11 2SA1302 R39 100K R35 15K

Q19 2N5401

220 C5 Q13 2N5551 0.047/630V GROUND

Q12 2N5551

D6 FR204 R24 15K Q17 2N5551

C4 0.1/100V

Z3 1N4749A
1n/50V C6 R48 20K R49 10K R2

10n/50V C8 R4 470

-65VNL

Z4 1N4735A D2

NOT USED
TEMP SENSOR POWER TEMP SENSOR OUTPUT TEMP SENSOR GROUND CLIP (-) SPEAKER RAIL
5 HEADER 5 4/14/92 R37 changed from 274/1% to 255/1%

IC2 LM35DP

CREST AUDIO INC. 150 Florence Ave. Hawthorne, NJ 07506 Title LA601 OUTPUT STAGE Size B Date:
Document Number 21B1157 Thursday, May 18, 2000

Rev 01 Sheet 1

R65 Z1 1N5925A R66 Z2 1N5941A 20K C9 0.001/50V Q28 2N5551 16K
R61 NOT USED RC11 0.01/50V R45 D7 1N4148 Q2 2SC2336BQ R6 10/1W Q4 2SC3281 R11 2.2/1W R15 2.2/1W R17 2.2/1W Q6 2SC3281 Q10 2SC3281 Q12 2SC3281 R23 2.2/1W Q18 2SC3281 R39 100K R41 150/1% Q26 2N5401 Q20 2N5551 R43 100/1% R53 270K R55 D3 1NL1 2uH R59 1/5W 5 R3 100/1W IC1 LA2500 R5 150/1W R8 51/2W R10 30/2W R26 0.33/5W R30 0.33/5W R32 0.33/5W R38 0.33/5W R42 R16 2.2/1W Q7 2SA1302 R18 2.2/1W Q11 2SA1302 R24 2.2/1W Q13 2SA1302 150/1% R40 2.2/1W R7 10/1W D8 1N4148 Q3 2SA1006BQ Q5 2SA1302 Q19 2SA1302 R48 100K R46 15K Q23 2N5551 R50 15K 100K R44 100/1% Q21 2N5401 D4 1N4004 R54 Q27 2N5551 Q25 2N5551 D6 FR204 C6 0.1/100V 220 C5 0.047/630V R60 2/5W OUT GROUND

+ 75 V. Q22 2N5401 R49 15K R47 100K Q24 2N5401 D5 FR204 C7 0.1/100V

C1 100/6.3V

C2 0.1/100V

Q1 2SC3068 R2 620

D9 1N4148

R4 150/1W

R9 30/2W

R25 0.33/5W

R29 0.33/5W

R31 0.33/5W

R37 0.33/5W
D10 1N4148 VR1 PTC15LB/100
Q29 2N5401 C8 0.001/50V R67 Z3 1N5941A

C10 0.01/50V RR68 R62

- 75 V.

Z4 1N5925A

J2 TEMP SENSOR POWER TEMP SENSOR OUT POWER SUPPLY GROUND CLIP CLIP + OUTPUT SIGNAL POWER SUPPLY GROUND 7 TEMP/CLIP

R56 1K

CREST AUDIO INC. 150 Florence Ave. Hawthorne, NJ 07506 Title LA901 OUTPUT STAGE Size C Date:
Document Number 21C1240 Tuesday, May 16, 2000 Sheet
R65 Z1 1N5925A R66 Z2 1N5941A 18K C9 0.001/50V 22K
R61 NOT USED RC11 0.01/50V R45 Q2 2SC2336BQ R6 10/1W Q4 2SC3281 R11 C2 0.1uF/100V 2.2/1W R15 2.2/1W R17 2.2/1W Q6 2SC3281 Q10 2SC3281 Q12 2SC3281 R19 2.2/1W Q16 2SC3281 R23 2.2/1W Q18 2SC3281 R39 100K R41 100/1% Q26 2N5401 Q20 2N5551 R43 100/1% R53 270K R55 D3 1NL1 2uH R59 1/5W 5 R3 100/1W IC1 LA2500 R5 150/1W R8 51/2W R10 30/2W R26 0.33/5W R30 0.33/5W R32 0.33/5W R34 0.33/5W R36 0.33/5W R38 0.33/5W R42 R16 2.2/1W Q7 2SA1302 R18 2.2/1W Q11 2SA1302 R20 2.2/1W Q13 2SA1302 R22 2.2/1W Q15 2SA1302 R24 2.2/1W Q17 2SA1302 100/1% R40 2.2/1W R7 10/1W D8 1N4148 Q3 2SA1006BQ Q5 2SA1302 Q19 2SA1302 R48 100K R46 15K Q23 2N5551 R50 15K 100K R44 100/1% Q21 2N5401 D4 1N4004 R54 Q27 2N5551 Q25 2N5551 D6 FR204 C6 0.1/100V 220 C5 0.047/630V R60 2/5W OUT GROUND
+ 85 V. Q22 2N5401 R49 15K R47 100K Q14 2SC3281 R21 2.2/1W Q24 2N5401 D5 FR204 C7 0.1/100V

Q28 2N5551

D7 1N4148

C1 100uF/6.3V

RQ1 2SC3068 R1 6

R33 0.33/5W

R35 0.33/5W
D10 1N4148 R12 VR1 PTC15LB/100
Q29 2N5401 C8 0.001/50 R67 Z3 1N5941A

- 85 V.

JCLIP/TEMP
CREST AUDIO INC. 150 Florence Ave. Hawthorne, NJ 07506 Title LA1201 Size C Date:
Document Number 21C1159 Thursday, May 18, 2000 Sheet