Velleman K4306 - Circuit Diagram

15
Diagram
H
IGH IN
GND
C1
220n
R5
470K
RV1
220K
R9
47K
UA741
IC1
+V
2
3
4
7
6
D2
1N4148
D1
1N4148
R20
330
+V
R1
3K
C5
47u
6V2
ZD1
C7
470u
5
4
SIG
RLO
6
RHI
REF
7
R14
2K2
ADJ
8
+V
3
2
V+
V-
LD3
GREEN
18
-13dB
LD5
GREEN
-10dB
17
LD7
GREEN
-8dB
16
LD9
GREEN
-6dB
15
LD11
GREEN
-4dB
14
LD13
GREEN
-3dB
13
LD15
GREEN
-2dB
12
LD17
GREEN
-1dB
11
LD19
GREEN
0dB
10
LD1
GREEN
-23dB
1
+
GND
D9
1N4007
C4
470u
C3
220n
+V
IC4
LM3916
12...15VDC
+3dB
LD25
RED
DOT/BAR
2
V-
1
LM3916
4
ADJ
REF
RHI
8
7
6
RLO
SIG
IC5
5
15
17
18
16
LD23
YELLOW
LD21
YELLOW
14
+1dB
13
12
+2dB
3
+V
MODE
9
LD29
RED
LD27
RED
11
10
+4dB
V+
+5dB
+V
JB3
D5
1N4148
D6
1N4148
R15
1K
NC
NC
NC
NC
NC
MODE
9
R2
3K9
R17
2K2
R19
2K2
+V
R21
47/1W
DOT/BAR
JD2
JB2
UA741
IC2
D3
1N4148
R4
3K9
R3
3K
GND
LOW IN
RV2
220K
R10
47K
R7
47K
C2
220n
3
2
D4
1N4148
6
DOT/BAR
JB1
DOT/BAR
R22
47/1W
R13
18K
+V
-2dB
LD16
GREEN
-23dB
LD2
GREEN
2
V-
1
LM3916
4
ADJ
REF
RHI
R11
2K2
8
7
6
C6
47u
RLO
IC3
15
LD10
GREEN
LD8
GREEN
LD6
GREEN
LD4
GREEN
17
18
-13dB
16
-10dB
-8dB
LD14
GREEN
LD12
GREEN
14
-6dB
-4dB
13
12
-3dB
+V
D7
1N4148
D8
1N4148
R18
2K2
NC 16
JD1
+V
SIG
3
5
V+
ADJ
V-
8
2
R16
1K
LD20
GREEN
LD18
GREEN
9
11
10
-1dB
MODE
0dB
18
1
17
NC
NC
NC
3
LM3916
RLO
RHI
REF
SIG
6
7
4
IC6
5
MODE
+V
JB4
9
LD26
RED
LD24
YELLOW
LD22
YELLOW
15
14
NC
+1dB
13
12
+2dB
+3dB
LD28
RED
LD30
RED
+5dB
11
10
+4dB
V+
LEFT
RIGHT
IC1 = A1,A2
+V
7
4
R12
18K
R6
47K
LOW IN
R8
470K
H
IGH IN
modifications reserved
18. DIAGRAM