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40
Flashing alarm
system
YOU WILL NEED
+ your flasher circuit from
Experiment 14
+ 1 short wire bridge
HERE'S HOW
1. Insert a small wire bridge into the
contact clips at the bottom left.
What change do you notice?
2. Remove the wire bridge again.
A
R2
LED1
220 kΩ
C
R1
R3 470 Ω
100 kΩ
A
+
T1
C1 100 µF
B
LED 1
R 3
R 1
470
100 k
C 1
100 F
T1
A
B
EXPERIMENT 17
+
LED2
A
C
–
+
R4
C2 10 µF
470 Ω
T2
LED 2
R 2
R 4
220 k
470
C 2
10 F
T2
+
9V
–
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