Velleman projects K8035 Assembly instructions - Manual (Page 14)

14
21. Schematic diagram.
Schematic diagram
DY1
a 14
b 13
c 11
d 5
e 4
f 2
g 1
DP 10
A
3
A
12
DY4
SA39-11EWA
R1....R8: 150
+5V
DY4
DY3
DY2
DY1
A
B
C
D
E
F
T1
BC557
T2
BC557
T3
BC557 BC557
R12
10K
R1
R2
R3
R4
R5
R6
R7
R8
R9
10K
R10
10K
R11
10K
SW1
SELECT
SW2
"DOWN"
SW3
"UP"
SW4
"ENTER"
GND
G
DP
SW4
SW3
SW2
SW1
11 b
DP
SA39-11EWA
DY3
2 f e
1
10
g
5
4
d
c
3
14
13
a A A
11 b
DP
SA39-11EWA
DY2
2 f e
1
10
g
5
4
d
c
3
14
13
a
12
A A
11 b
DP
SA39-11EWA
2 f e
1
10
g
5
4
d
c
3
14
13
a
12
A A
12