The assembly is typical and should not cause
the problems. It runs in standard way starting
from the smallest components and ending with
the largest ones.
The device assembled from the tested
components does not require any adjustment
and operates immediately after the power is
turned on. The twilight switch will not only be
used for lighting control but also in
photography, modeling and other applications.
In the active mode twilight switch consumes a
current of approximately 100mA.
Figure 1.
Schematic diagram
AVT 1460
2
Twilight switch
DIFFICULTY
LEVEL
Assembly and test
TL081P
1N4148
1N4148
1N4007
V+
V+
V+
GND
BC558
2
3
6
7
4
US1
X2
X3
PR1
100k
100nF
D2
D3
D1
LED1
R1
150k
R2
47k
1k
R3
R4
330k
100uF
62k
R5
1,5k
T1
PK1
R6
C1
C2
220uF
C3
+
+
+ 12V -
+ 12V -
Figure 2.
Connection example
Start off by soldering the printed circuit elements in order from smallest to largest. The unit assembled
flawlessly, using the supplied components will operate immediately after switching on the power supply.
Photoresistor
