ZD2
56V
500mW
3x
22µF/63V
ZD1
18V
T3
MPSA42
R3
100K
1N4002
3x
D7
1N4148
10K
R2
35V
220µF
C4
MPSA42
T4
MPSA42
T5
150K
R5
15K
R6
4K7
R7
22K
R8
10K
R10
10K
R4
U1
78L05
C7
100nF
C6
10nF
ATTiny13A
U2
470K
R9
R12
33K
R11
33K
T1
BC337/25
C5
4.7µF/63V
BC547
T2
R1
4K7
X2:1
X2:2
X2:3
X2:4
b
a
b
a
(c) Axel Schwenke
Dezember 2017
Haustelefon
16V~
C1
C3
C2
D3
D2
D1
BR1
X1:2
X1:1
LD1
"talk"
"ring"
"sense"
Vcc
PB1
PB0
ADC3
GND
2
5
1
3
2
8
6
4
D5
90V
30V
40V
31V
18V
D4
D6
3x 1N4002
"line"
LD2
TAE 2
TAE 1