Title
Size
No.
R
ev.
File
Date
Time
o
f
.title~
A4
PAT-20TB SCHEMATIC
.rev.
C:\...\C
SI\P
AT-
20TB.sch
2005/07/06
17:50
1
1
note1
note2
note3
note4
note5
C57
100/10
C58
100/10
1
2
3
4
5
6
7
8
9
10
11
U51
TDA2005
R56
10
R54
2.2K
C60
104M
R58
1
R57
1
C52
1/50
R52
120K
C55
47/10
R53
1K
C59
104M
R55
10
C56
47/10
JK2
C1
1000/16
C53
10/50
C51
1/50
SW11
TALK.BACK
MI C.SW
R3
4.7K
D3
1N4148
C2
10/50
Q1
C3198
R2
4.7K
Q11
C3198
D11
1N4148
C22
220/16
R27
270
D2
1N4148
R21
6.8K
SW1
POWER.SWITCH
D1
1N4005
VR12;10K
AUX.VR.
R1
2.2K
LD1
POWER.LED
CH1
R33
12K
Q15
C3198
C24
100/10
R34
120K
R32
4.7K
Q14
C3198
R31
12K
VR13;10K
TONE.VR
C25
393M
RY1
Q12
C3198
C23
10/50
R25
12K
JK1
R26
12K
R23
6.8K
R22
6.8K
R28
12K
R30
4.7K
R29
4.7K
R51
2.2K
C54
220/16
C11
1/50
C15
821C
R16
4.7K
R19
2.2K
+
5
-
6
7
U11/B
4558
C21
10/50
R11
4.7K
R12
27K
C16
1/50
C17
821C
R17
120K
C18
1/50
R18
390
+
3
-
2
1
U11/A
4558
C13
10/50
R13
1K
C12
821C
C14
1/50
R14
27K
C19
1/50
VR11;10K
MIC.VR.
C61
220/10
SP51
C26
821C
R59
1/1W
R20 270
RY2
C20
104C
T11
AUX INPUT
GND LINE
B+ LINE
BATTERY POWER +12V
MIC INPUT
speco technologies
OUTPUT -
PAT-20TB SCHEMATIC DIAGRAM