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SESK: Stuff Everyone Should Know · sesk.info/hame-flip-flops-divide-16

How many flip-flops are needed to divide a signal's frequency by 16?

Four flip-flops, since each one divides by 2.

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  1. 6
  2. 4 ✔
  3. 8

Why: One flip-flop divides by 2, two divide by 4, three divide by 8, and four divide by 16. Each stage halves the frequency again.

Huh, didn't know that: A single flip-flop can divide the frequency of a pulse train by 2 (E7A03).

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Which logic device keeps on making jokes? A JK flip-flop.
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References

Answer: 4. One flip-flop divides by 2, two divide by 4, three divide by 8, and four divide by 16. Each stage halves the frequency again.

  1. NCVEC 2024-2028 Amateur Extra Question Pool, E7A04 (4th errata, Feb. 4, 2026) www.ncvec.org/downloads/2024-2028%20Extra%20Class%20Question%20Pool%20and%20Syllabus%20Public%20Release%20with%204th%20Errata%20Feb%204%202026.pdf
    A. 4
    Checked 2026-10-11.
  2. NCVEC 2024-2028 Amateur Extra Question Pool, E7A03 (4th errata, Feb. 4, 2026) www.ncvec.org/downloads/2024-2028%20Extra%20Class%20Question%20Pool%20and%20Syllabus%20Public%20Release%20with%204th%20Errata%20Feb%204%202026.pdf
    B. A flip-flop
    Checked 2026-10-11.

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