With respect to the following 555 timer circuit what will be the value – McqOptions

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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 K , 600
B.	45 K , 630
C.	43.5 K , 580
D.	44.9 K , 600
Answer» B. 45 K , 630

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