A
B
C
DD
C
B
A
EA/VP
31
X1
19
X2
18
RESET
9
RD
17
WR
16
INT0
12
INT1
13
T0
14
T1
15
P10/T
1
P11/T
2
P12
3
P13
4
P14
5
P15
6
P16
7
P17
8
P00
39
P01
38
P02
37
P03
36
P04
35
P05
34
P06
33
P07
32
P20
21
P21
22
P22
23
P23
24
P24
25
P25
26
P26
27
P27
28
PSEN
29
ALE/P
30
TXD
11
RXD
10
GND
20
Vcc
40
STC89C51/52
89C52RC
C1
10uf
S0
VCC
C3
30p
C2
30p
12MHZ
D1
S1
S2
S3
R5
10K
P32
P35
P13
P32
P35
P13
IN+
3
IN-
2
GND
4
V OUT
5
GAIN
1
GAIN
8
BYPASS
7
Vcc
6
386运放
LM386
C7
10uf
C8
100uf
C6
104
C5
473
VCC
+
-
BEEP
0.25W
R2
10K
R3
1K
R4
10
3
2 1
P1
POWER
1
1
2
2
3
3
4
4
5
5
6
6
S1
SWITCH
VCC
RT1
104
VCC
R1
2.2K
VCC
Print to PDF without this message by purchasing novaPDF (http://www.novapdf.com/)
