
1 2 3 4
A
B
C
D
4321
D
C
B
A
Title
Number RevisionSize
A4
Date: 28-Feb-2012 Sheet of
File: F:\新建 文件夹 \气体 传感器插座 .DDB Drawn By:
5.0V
3.3V
R1
10K
R2
10K
R3
10K
1
2
3
P-POWER
Header 3
4
6
1
3
2 5
Q1
MQ-2
4
6
1
3
2 5
Q2
MQ-5
4
6
1
3
2 5
Q3
MQ-7
LDR1
Light Dependent Resistor
1
2
3
4
5
P-TEST
Header 5
LS1
Bell
5.0V
R5
Res1
12K
1
2
P1
Header 2
Q4
2N3906
R4
Res1
12K
5.0V
Q5
2N3904