counter

Question

a  divide by 78 counter can be realised by using-

a) 6 numbers of mod- 13 counters

b) 13 numbers of mod 6 counters

c) one mod 13 counter followed by one mod 6 counter

d) 13 numbers of mod 13 counter

 ans-

only a ,  only b , only c,  both a and b ?

Comments

(d) cannot be option.

i think .both (a) and (b)... rest i dont know...

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ans is C

Answer 1

A divide by 78 means Modulo 78 counter.

Overall Mod of the connected counter =M1 * M2 * M3.....Mn.

in option C it is 13*6 = 78.

Therefore answer is C.

Answer 2

A divide by 78 means Modulo 78 counter.

To create a modulo 78 counter the required counter must have 7 output lines.A mod 13 counter normally have 4 output lines  and 1 mod 6 counter will have 3 output lines so when we will place both the counters side by side they will form a counter which can count upto pow(2,7)  or lesser .

this combination will have 7 output lines.

so ,the answer should be c.