Electronics - Flip-Flops and Timers - Discussion
Discussion Forum : Flip-Flops and Timers - General Questions (Q.No. 8)
8.
The equation for the output frequency of a 555 timer operating in the astable mode is: 
.
What value of C1 will be required if R1 = 1 k
, R2 = 1 k, and f = 1 kHz?
. What value of C1 will be required if R1 = 1 k
, R2 = 1 k, and f = 1 kHz?0.33 
F
F0.48 F
F480 F
F33 nF
Discussion:
2 comments Page 1 of 1.
Rajshree said:
1 decade ago
Basic Formula is F = 1.43/(R1+2R2)*C1.
=1=1.43/(1+2*1+C1.
So,
C1 = 1.43/2+1.
= 1.43/3.
= 47666.
ANS 0.48 uF.
=1=1.43/(1+2*1+C1.
So,
C1 = 1.43/2+1.
= 1.43/3.
= 47666.
ANS 0.48 uF.
Ujjwal said:
1 decade ago
c1=1.43/(f*(r1+2r2))
So c1=1.43/(3k * 1k)
c1=.47666 uF.
So c1=1.43/(3k * 1k)
c1=.47666 uF.
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