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2

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F

D1 3mm Green
low-curr. JP1A XSIP10 JP1B XSIP10 JP1C XSIP10 1 2 3 LED1 LED2 BA3 BA2 BA1 TR1 TR2 3 2 3 2

F

EXTERNAL POWER SUPPLY

V+

Vs

P1 POTI
1 BASS 50KB

J4
2 5 4 1

R203 R201 18k
+ 2 1

TR2

100 C21
+ TR1 TR3

J7001 B1

D201

C24 12N R21 1K5 C26 1N
7

C201 220 R202 18k C202 + 220

C203 47

P2 POTI
1 TREBLE 50KB E

22N

4001

E

SNAP
VVV+ INPUT VVV-

1

V+ 9 8

TR3 3

P3 POTI
1 2

GAIN

100KA

C11
6

U1B 4558S

47P
2 3 2 1

R22 100

J1

Q1 BC264D R1 33K
1 3

R11 2K2
V+ 1

C10 3.3

R10
3

U1A C20
2

C22 39N R20 8K2
BA2 BA3 BA1

C23 22N R23 10K
JP1D XSIP10 JP1E XSIP10 JP1F XSIP10 4 5 6 +

C25 1 C104 10 R34 330K
D

J8004
D

10K

4 5

4558S

10

V-

R2 1M
VV-

R3 3K3
V-

R108 2K2
XON

R105 1M C105 47N
V-

D2
3

Q6

2

K30A-Y
1

V+

C30 56N
C BYPASS

Q2
3

2

R109 4K7 K222E
V-

4148

K30A-Y Q5 2
1 C

1

C31 R30 200K J3
3 2 1 3

D101 4148 SW101A
2 1

Vs

V-

R102 100K U101 SW2204
3 1A 1SP 1DP 1DN 1SN VDD 2DP 2A 2DN VSS 10 3A 3SP 3Y 3SN 2 1 5 4 14 13 8 7 11 12 9 V-

1 R31 10K R110 2K2
V-

R32 330K

3

XOFF

R111 1M C106 47N

D6 R33 330K 4148
V+

J8004

XOFF

2

D5 4148 R103 100K
XON

V-

C40 1

Q3
3

OUTPUT

SW101B
6 5 4 B 6

C2362G
1

3

J2

C41
2

SW2204 R101 470K

R106 R104 1M C102 10N
V-

D3 4148

510 R107 2K7
V1

2

LED1

LED2

Q4 C2362G
3 +

R40 200K

R41 2K2

3.3

R42 200K

1

B

J8004
V-

V-

V-

C101 1N
VV-

4007

C103 1
(c) Copyright 1997 - ALL RIGHTS RESERVED
All unspecified capacitors in uF, resistors carbon 5%

V-

V-

>_RU\c5\USdb_^YSc
Barnerstrasse 42, 22765 Hamburg, Germany
A Title Number: Date: File: 1 2 3 4 5

http://wwww.nobels.com - email: [email protected]

A

CIRCUIT DIAGRAM

PREAMP-BOOSTER / PRE-1
21-Jan-2000
Time:

Size: A4 Sheet 1

Rev: 2 of

15:46:10

1

R:\$PRO\PEDS\DSGN\PRE-1\PRE1R1.SCH 6