Thames & Kosmos Electronics - Other flash patterns

EXPERIMENT 

Other flash
patterns
YOU WILL NEED
 your flasher circuit from
Experiment 14
 and additional household
items: paper, pencil
By changing the combinations of R1, R2,
C1, and C2, you can get different flash
combinations too!
 WHAT’S HAPPENING?
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
resistors (R1 and R2) and the two
capacitors (C1 and C2). Make a note
of which positions produce short or
long flash patterns.
LED1
LED2
T1
+
–
T2
A
A
C
C
R3  Ω
C1  µF
R
 Ω
R2
 kΩ
C2  µF
+
+
R
 kΩ