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ÿþ+
+
+
+
16 x 1(or 2) LCD Display
16 x 1(or 2) LCD Display
16 x 1(or 2) LCD Display
16 x 1(or 2) LCD Display
7805
7805
7805
7805
9V
9V
9V
9V
1N4004 R/W Vo Vss
1N4004 R/W Vo Vss
1N4004 R/W Vo Vss
1N4004 R/W Vo Vss
Ext
Ext
Ext
Ext
+ +
+ +
+ +
+ +
DB7 ... DB4 E RS Vdd
DB7 ... DB4 E RS Vdd
DB7 ... DB4 E RS Vdd
DB7 ... DB4 E RS Vdd
DC
DC
DC
DC
14 13 12 11 6 5 4 3 2 1
14 13 12 11 6 5 4 3 2 1
22µF 10µF 14 13 12 11 6 5 4 3 2 1
22µF 10µF 14 13 12 11 6 5 4 3 2 1
22µF 10µF 0.1µF
22µF 10µF 0.1µF
0.1µF
0.1µF
Gnd
Gnd
Gnd
Gnd
Vcc
Vcc
Vcc
Vcc
C
C
C
C
5k
5k
5k
5k
100k
100k
100k
100k
4.7k
4.7k
4.7k
4.7k
L
L
L
L
100k
100k
100k
100k
+
+
+
+
10µF
10µF
10µF
10µF
L 4.7k
L 4.7k
L 4.7k
L 4.7k
47k
47k
47k
47k
2 18 3 6 7 8 9 10 11
2 18 3 6 7 8 9 10 11
2 18 3 6 7 8 9 10 11
2 18 3 6 7 8 9 10 11
14
14
14
14
B0 B1 B2 B3 B4 B5 Vcc
B0 B1 B2 B3 B4 B5 Vcc
B0 B1 B2 B3 B4 B5 Vcc
B0 B1 B2 B3 B4 B5 Vcc
100µH Ccal
100µH Ccal
100µH Ccal
100µH Ccal
1
1
1
1
1000pF + +
1000pF + +
1000pF + +
1000pF + +
4
4
4
4
PIC 16F628
PIC 16F628
PIC 16F628
PIC 16F628
Timer 0
Timer 0
Timer 0
Timer 0
Reset
Reset
Reset
Reset
- -
- -
- -
- -
17 B7 B6
17 B7 B6
17 B7 B6
17 B7 B6
5 13 12 15 16
5 13 12 15 16
5 13 12 15 16
5 13 12 15 16
+
+
+
+
1N914
1N914
1N914
1N914
"Zero"
"Zero"
"Zero"
"Zero"
10µF X1
10µF X1
10µF X1
10µF X1
33pF 33pF
33pF 33pF
33pF 33pF
33pF 33pF
4MHz
4MHz
4MHz
4MHz
Drawn by VK3BHR
Drawn by VK3BHR
Drawn by VK3BHR
Drawn by VK3BHR
RY1
RY1
RY1
RY1
5V N/O
5V N/O
5V N/O
5V N/O
1K
1K
1K
1K
PIC
PIC
PIC
PIC
1K
1K
1K
1K
16F628
16F628
16F628
16F628
4MHz 1K
4MHz 1K
4MHz 1K
4MHz 1K
0.1µF
0.1µF
0.1µF
0.1µF
crystal
crystal
crystal
crystal
1K
1K
1K
1K
ZERO P/B
ZERO P/B
ZERO P/B
ZERO P/B
33pF
33pF
33pF
33pF
4.7K
4.7K
4.7K
4.7K
4.7K
4.7K
4.7K
4.7K
33pF
33pF
33pF
33pF
5K
5K
5K
5K
100K
100K
100K
100K
trimpot
trimpot
trimpot
trimpot
+
+
+
+
47K 100K
47K 100K
47K 100K
47K 100K
10µF
10µF
10µF
10µF
100K
100K
100K
100K
+
+
+
+
T
T
T
T
10µF T
10µF T
10µF T
10µF T
+
+
+
+
10uF
10uF
10uF
10uF
0.001µF 0.001µF
0.001µF 0.001µF
0.001µF 0.001µF
0.001µF 0.001µF
7805
7805
7805
7805
RELAY
RELAY
RELAY
RELAY
22µF
22µF
22µF
22µF
+
+
+
+
25V
25V
25V
25V
1N914
1N914
1N914
1N914
+ -
+ -
+ -
+ -
Backlight Power
Backlight Power
Backlight Power
Backlight Power
To PIC
To PIC
To PIC
To PIC
C L
C L
C L
C L
pin 12
pin 12
pin 12
pin 12
L/C Switch
L/C Switch
L/C Switch
L/C Switch
L/C Ground
L/C Ground
L/C Ground
L/C Ground
1k
1k
1k
1k
1k
1k
1k
1k
1k
1k
1k
1k
1k
1k
1k
1k
Unknown
Unknown
Unknown
Unknown
(Lu or Cu)
(Lu or Cu)
(Lu or Cu)
(Lu or Cu)
100k
100k
100k
100k
C
1000pF
C
1000pF
C
1000pF
C
1000pF
Switch
Switch
Switch
Switch
To L/C
To L/C
To L/C
To L/C
100µH
100µH
100µH
100µH
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