Electronics and Communication Engineering - Exam Questions Papers - Discussion

Discussion Forum : Exam Questions Papers - Exam Paper 7 (Q.No. 34)

Exam Questions Papers

34.

With respect to the following 555 timer circuit what will be the value of R_A and R such that the LED turns on for a duration of 10 ms every time it receives negative trigger pulse. LED operating current = 20 mA, V_f = 1.4 V, Vo _on = 13.4 V and C = 0.22 nf

41.4 KΩ, 600 Ω

45 KΩ, 630 Ω

43.5 KΩ, 580 Ω

44.9 KΩ, 600 Ω

Answer: Option

Explanation:

Timer operated in mono, mode

R_AC =

∴ R_A = 41.4 KΩ

R = = 600 Ω.

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