PBL 3853
IL
+ LINE
R -0-4kΩ
L
Z
=150Ω
Mic
0 ohm when artificial
line is used
MIC
5H+5H
Recelver
cut-off
V
ARTIFICIAL
LINE
3
+
R
= 400Ω+400Ω
feed
C
Transmitter
mute
Recevler
tone
Z= 500Ω
IDC
600Ω
V
VL
input
+
2
V
5
E= 50V
REC
V
1
VDC
Z
PBL 3853
see fig 4
V
4
Rec
=350Ω
C = 1µF when artificial line is used
470µF when not used
-
LINE
Figure 2. Test set up without rectifier
bridge.
IL
U
= 15-16V
z
R
-0-4kΩ
+ LINE
L
Z
=150Ω
Mic
0 ohm when artificial
MIC
line is used
5H+5H
Recelver
cut-off
V
3
R
=
400Ω+400Ω
feed
Transmitter
mute
1µF
Recevler
tone
input
Z= 500Ω
IDC
600Ω
V
+
2
VL
V
5
E= 50V
REC
V
1
VDC
PBL 3853
see fig 4
350Ω
V
Z
4
Rec
-
LINE
Figure 3. Test set up with rectifier bridge.
I
+ Line
L
R 13
R12
9
R1
R2
1
R1 = 2.7 k
R2 = 22 Ω
R3 = 6.8 k
R4 = 1.8 k
R5 = 75Ω
R6 = 910 Ω
R7 = 6.2k
R8 = 560Ω
R9 = 11 k
R10 = 4.7k
R11 = 120k
R12 = 56Ω
R13 = 68Ω
RC = 30 k*
RD = 11k*
C1 = 150 nF
C2 = 10 nF
C3 = 47 µF
C4 = 220 nF
C5 = 150 nF
C6 = 47 nF
C7 = 100 nF
C8 = 68 nF
C9 = 4.7µF
C10 = 22 µF
PBL3853
C1
5
-
7
8
T2
+
AC-DC char. adjust
+
-
Transmitter mute
10
T1
+
-
4
18
+
V
12
13
6
C9
16
M
Rx
T
Mic
X
+
V
DC
Rec
D1 = Z 4.5 V
D2 = 1N4148
D3 = 1N4148
14
Receiver
C7
11
C4
17
2
15
3
+
Cut-off
Tone in
R6
C10
D1
D2 D3
C5
R3
T1 = BC178B
T2 = BC178B
R
C
RA
R7
R
DTMF
R11
R10
C8
+
R8
R5
DTMF
In
C2
C3
R4
RB
R
D
C6
* values for the test set up only
R9
-Line
Figure 4. Reference figure with line length regulation. DIP-package.
2
ERICSSON [ ERICSSON ]
