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Timer switch
YOU WILL NEED
+ 2 resistors, 470 Ω
+ 1 resistor, 3.3 kΩ
+ 1 resistor, 22 kΩ
+ 1 resistor, 100 kΩ
+ 1 resistor, 220 kΩ
+ 1 capacitor 10 µF
+ 2 LEDs
+ 2 transistor modules
+ 1 pushbutton
+ 5 short wire bridges
+ 1 long wire bridge
+ electronics board
+ battery clip
+ and additional household
item: 9-volt square battery
HERE'S HOW
1. Assemble your timer switch and
connect the battery. Wait for the
red LED to come on and the green
one to go out by itself. Now your
timer switch is ready!
2. Press once on the
pushbutton.
R1
3.3 kΩ
LED1
A
C
Pb1
R4
R3
470 Ω
100 kΩ
R2
22 kΩ
+
T1
C1 10 µF
LED 1
R 1
R 3
3.3 k
470
Ta 1
C 1
10 F
T1
R 4
100 k
R 2
22 k
Timer Switches
EXPERIMENT 9
+
LED2
A
C
–
R5
R6
220 kΩ
470 Ω
T2
LED 2
R 5
R 6
220 k
470
+
9V
–
T2
29
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