Schematics

1
1
2
2
3
3
4
4
D D
C C
B B
A A
ANTENNA
C7
47P
C6
47P
C5
300P
C3
47P
L1
7.5uH
L2
2.2uH
L3
2.2uH
R2
22K
R3
100
R4
150K
Y1
27.145MHz
C8
103
C2
68P
T1
15T
C1
68P
C4
103
Q1
2712
Q2
2712
R1
100R
DATA
VCC
ZD1
3.3V
LED
R5
470R
C11
104
VDD
R6
3.9K
R7
220K
VDD
DATA
C10
104
C9
104
R8
NC
C12
0R
1 2 3 4 5 6 7 8
9
10 11 12 13 14
U1
PT977
K1
S1
S2
VDD