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Byju's Answer
Standard XII
Physics
Impedance
An astable mu...
Question
An astable multivibrator is designed using 555 timer IC as shown below.
Given that
R
A
=
450
Ω
;
R
B
=
0.5
k
Ω
;
C
=
1
μ
F
The free running frequency of the multivibrator is _____Hz
1000
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Solution
The correct option is
A
1000
f
=
1.45
(
R
A
+
2
R
B
)
C
=
1.45
(
0.45
+
2
×
0.5
)
×
10
5
×
1
×
10
−
6
=
1.45
1.45
×
10
3
H
z
=
1000
H
z
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