1.

With respect to the following 555 timer circuit what will be the value of RA 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, Vf = 1.4 V, Vo on = 13.4 V and C = 0.22 nf

A. 41.4 KΩ, 600 Ω
B. 45 KΩ, 630 Ω
C. 43.5 KΩ, 580 Ω
D. 44.9 KΩ, 600 Ω
Answer» B. 45 KŒ©, 630 Œ©


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