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38
Other flash
patterns
YOU WILL NEED
+ your flasher circuit from
Experiment 14
+ and additional household
items: paper, pencil
HERE'S HOW
1. Switch the positions of the two
capacitors (C1 and C2) in your
circuit. Make sure that their poles
are turned as shown in the
illustration.
Does the flash pattern
change?
2. You can also try switching the R1
and R2 resistors and then return C1
and C2 back to their original posi-
tions.
3. Try all the flash combinations you
can get by switching the two
A
R2
LED1
220 kΩ
C
R1
R3 470 Ω
100 kΩ
+
T1
C1 10 µF
resistors (R1 and R2) and the two
capacitors (C1 and C2). Make a note
of which positions produce short or
long flash patterns.
EXPERIMENT 15
+
LED2
A
C
–
+
R4
C2 10 µF
470 Ω
T2
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