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H1-1 H1-2 EFF SEND J3 EFF RTN J4 H1-3 P5 B50K + R31 47K ­V R23 1M C3 10 C2 J2 LOW .068 R4 13K R3 39K 2 C1 J1 HI R1 3 ­
A1.A

P1 H1-4 cw 25K

­ MID R48 2.7K R32 47K 2 3 ­ A4.A + R33 1 1.5K MID FREQ C18 R25 10K .033 cw P3 B50K C19 BASS R26 10K P6.A C50K C22 cw .022 P6.B cw C50K R100 470 R35 1.5K R34 4.7K .022 6 5 ­
A4.B

H1-5 R51 R50 47K 47K 6 5
A5.B

BALANCED OUT +

R24 22K

C21 DEEP S2 7 R44 15K C25 .047 R45 33K 2 ­
A5.A

R49 270

R5 82K C4 82pF C6 1 .022 R101 10K R7 3.9K 3 + 2

R9 560 R8 2.2K C9 10 R10 10K
A2.A

BRIGHT S1 R18 Q2 J175 1M R16 56K C12 27pF 6 ­
A1.B

Q3 J175 C13 R19 C15 .01 B R20 47K C51 R102 470K 6 5 560pF
A2.B

­ +

R52 H1-6 7 270

BALANCED OUT ­ H1-7 R103 47K

+

C49 10

FULL RANGE

.0033 10K R21 1K P2 A100K C16 C14 7 10 R22 2.2K 3 R82 2 82pF
A3.A

­ +

C48 1

10 R70 6 5 ­ +
A8.B

H1-8 470 R72 N/U C38 27pF R73 100K 6 5
A7.B

1

C8 .22 R12 56K

C15 ON PCB

VOLUME

BI AMP OUT

.0033 1K R2 1M

R6 3.9K C5 10pF C7 .22

R11 33K Q1 J175

3

+

OP1.B 1/2

R71 7 N/U

H4-1 H4-2 V+ OP3.B N/U H4-3 H4-4 H4-5 H4-6 H4-7

R27 33K R29 R36 4.7K C23 560pF R38 10K 6

R13 56K C11 .01 R14 R75 56K C10 .01 R76 220K C47 330pF 2 3 V+ FOOTSWITCH R92 680 R93 680 R94 680 R96 10K 5 H2-6 R95 10K J12 H2-8 H2-7 7 U1 6 B 9 U1 10 U1 12 15 U1 14 8 B ­E E ­V R84 1K 3 2N5550 Q6 U1 2 ­G U1 4 G C35 10 B 1 V+''
A9.A

5 R15 1M B

+

7

­ +

­

C17 1 10

R28 3.3K TREBLE

330pF

OP2.B 1/2

+

R17 22K 10K D2 D3 D4 C44 .047 2 ­
A7.A

cw 3.3K P4 B50K R30 3.3K

R69 6.8K

EQ

R41 0.5 1

V­ D10 7 N/U C39 N/U + R74 N/U

H4-8

­E

IN

V+' C20 .0022 R83 1 1K LED2

5

­ A3.B +

R37 7 10K

2 3

­

­ A8.A +

+

1M

E 4

C24 10 R39 10K R40 10K Q4 J175 Q5 J175

R42 10K C45 10 R43 10K R53 2 3 ­G R57 18K 2 3 cw P7.B CROSSOVER FREQ R59 POWER 1.5K R47 1M C26 .01 B C27 .01 B 4.7K C28 330pF R54 10K
A6.A

OP3.A N/U

B SUSTAIN

P8

cw

A100K C33 C32 1 10 180pF R77 3.3K V­' R85 300K 6
A9.B

R80 10K

C58 10 B

3

+

B 6 5 ­ + R56 7

B

R81 2.2M V+ OP1.A 1/2 B R99 10 C42 470/16 R105 Q7 68 C53 470/16 A9.8 + V+'' +

A6.B

H2-1 68 H2-2

R46 B G 1M

­ +

R55 68

N/U J5

1 C31

­ +

5 B R78 N/U C55 .22 C57 .1

­ +

D1 7 C34 10 B

Q8 R107 9.1K B R79 2.2K V+' R90 10K C46 6 R88 N/U
A10.B

680pF PHONES

R58 10K

R104 68 C52 470/16

B C29 A10.8 V+'' R106 1K LED3 0.1 cw P7.A C50K 0.1 + C30

­
A11.A

HI 1

R61 270

C50 10 P10 B50K H2-3 HI LEVEL C54 56pF R64 HI OUT

1 3

2

+

THRESHOLD P9.A P9.B cw C36 2 3 B C50KX2 .0022 R86 15K D5 1 C37 47/63 B B OP2.A 1/2 R87 1K

R97 B V+ 10 C40 470/16 R98 LED1 V­ 10 C41 470/16

B V+' +

C56 .022 R60

D6 D7 D8 D9

B V­' + B

1.5K R62 0.5 R63 18K R65 18K R66 18K

11

A10.A

­ +

1K

5

­ +

R91 7 1K

18K 6 ­
A11.B

R68 H2-4 7 270 LOW LOW OUT

R89 39K B B H3-3 H3-4 H3-5 H3-6

5

+

R67 10K H3-7 H3-8 H3-2

H2-5

PCB 30-02091

H3-1

FULL RANGE OUT

1

3

2

FS36-XLR (FOOTSWITCH) CH: VOL BOOST EFF1: EFF LOOP EFF2: GRAPHIC EQ

N/U A GND B GND

V+

V­ LAST USED LIST SYM A C D H J LED OP P Q R S U 30-02091 11 58 10 4 2 3 3 10 8 107 2 1 Off PCB Not Assigned

CARVIN
DRAWN BY:

1155 INDUSTRIAL AVE. ESCONDIDO, CA 92029 (619) 747-1710 FAX 747-9065

5. A11 IS A 5532 TYPE OP AMP. 4. CAPACITOR C58 IS A SECONDARY OPERATION, SOLDERED TO R80 AND A NEARBY VIA. 3. B GROUND IS NOISY GND AND A GROUND IS LOW NOISE SIGNAL GND. ALL GROUNDS ARE A UNLESS OTHERWISE SPECIFIED. 2. U1 IS: CD4049B. 1. ALL DIODES ARE TO BE 1N4003. NOTES: UNLESS OTHERWISE SPECIFIED. CH. EFF1 EFF2

43

PRO BASS PRE-AMP PCB SCHEMATIC
C. MCEUEN
DATE:

1 FEB 90

12

6
APPROVED: DATE:

1

MODEL PB500 PB200 PB15 LAST PCN: 349

PWR XFMR 15-50098 15-20071 15-00428

PWR MOD 80-14028 80-02018 80-02154

PCB NO: ASSY. NO: REVISED BY:

30-02091 80-02091 John L. Murphy

REV:

E K 5OCT93

REV:

DATE: