11
11
10
10
9
9
8
8
7
7
6
6
5
5
4
4
3
3
2
2
1
1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
J
J
K
K
L
L
M
M
N
N
O
O
P
P
Q
Q
of
Filename:
PCB#
Sheet
3
2
Product
Date:
Rev:
YsType: YsType
M1505V04sch.sch2006
M1505
Mon Dec 08, 2014
TONE CONTROLS
V04
SB112
C16
100V
680P
C19
100V
100P
R55
1/4W
.
6K98
63V
C69
100N
R15
1/4W
.
3K3
R14
1/4W
.
4K7
R13
1/4W
.
6K8
C12
100V
18N
1
/4
W
47K
R18
.
100V
C14
100P
R24
1/4W
MINI
1K0
100V
C18
10N
C40
100V
10N
C33
250V
4N7
R232
1/4W
.
2K
R132
1/4W
MINI
1K0
1
/4
W
6K98
R32
.
R167
1/4W
.
2K
R19
1/4W
.
2K49
U3:C
MC33079P
1
/4
W
2K
R80
.
11
V
-
4
V
+
U3:E
63V
C29
100N
100V
C17
10N
C15
100V
47N
C13
100V
680P
R79
1/4W
MINI
1K0
U2:A
MC33079P
M
P6
4494
HI-MID
1B LIN
50K
63V
C52
330N
R113
1/4W
MINI
20K0
C41
100V
100P
C2
100V
22N
INPUTS[M1]
SET JUMPER P200 TO "115V" FOR NORTH AMERICA.
SET IT TO "230V" FOR EUROPE.
63V
C259
100N
INPUTS[J1]
LEADS & PINS REFERENCE
R17
1/4W
.
3K3
R16
1/4W
.
4K7
R22
1/4W
.
4K99
R72
1/4W
.
4K99
R117
1/4W
MINI
1K0
C38
63V
220N
R63
1/4W
MINI
1K0
R75
1/4W
.
6K98
R21
1/4W
MINI
20K0
U3:B
MC33079P
M
LOW EXPANDER
P8
4493
10K
5B LIN
R169
1/4W
.
15K
C9
16V
10U
U3:D
MC33079P
11
V
-
4
V
+
U2:E
63V
C30
100N
DIP8
TL072CP (YS#6882)
MC33078P (YS#6840)
DIP14
MC33079P (YS#6804)
R53
1/4W
.
200K
R69
1/4W
.
100K
R12
1/4W
.
6K8
U2:B
MC33079P
U2:C
MC33079P
R54
1/4W
.
200K
B C
TO-92
E
MPSA13 (YS#5105)
MPSA42 (YS#5113)
U3:A
MC33079P
U2:D
MC33079P
POTENTIOMETERS AND KNOBS
MAINS VOLTAGE INPUT SETTING (NA<->CE)
M
4494
P4
TREBLE
50K
1B LIN
M
P3
LOW-MID
50K
4494
1B LIN
M
50K
1B LIN
P5
4494
BASS
S G
TO-92
D
J109 (YS#5122)
REF
KNOB
PART#
MODEL(S):-
FUNCTION
R
R
R
R
R
P6
P8
R
P3
P4
P5
P1
F
F
F
F
F
HI-MID
F
LOW-MID
TREBLE
BASS
GAIN
K
K
K
K
K
K
P
P
P
P
P
4494
4493
P
4494
4494
4494
N
N
N
N
N
N
4499
10020
10020
10020
10020
10020
10020
M1505 - POTS LIST
SMALL BLOCK - SB112
STYLE
P41
P41
P41
P41
P41
P41
LOW EXPANDER
13
10
7
4
1
9
11
12
8
#
2
3
5
6
VER#
MODEL(S):-
DATE
DESCRIPTION OF CHANGE
V
V
V04
V
V
D
D
5-DEC-2014
N
N
PC#8734:D2,D5 YS#6438(1N4007)added across the-
D
D
N
N
PC#8738:C20,C22 changed from 33P to 100N YS#5212.
-output of 7815 and 7915 regulators.
JAN-08-2013
V01
FIRST PRODUCTION RELEASE. - ML
.
.
.
M1505 DATABASE HISTORY
SMALL BLOCK - SB112
02-MAY-2013
on all V01 PCBs. - ML
Modified schematic to reflect rework done
13-MAY-2013
V02
PC8540: Rework on V01 included. GG
PC8550: Routed auxiliary signal to headphones. - ML
V03
09-JUL-2013
PC8696: Replace R65 2K05 to 4K99 (YS 4639)
11-SEP-2014
