[time-nuts] RFTG-m-RB

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jan 19 20:15:48 EST 2008

> Dividing by 3 and then multiplying by 2 is not necessary, it just adds
> complexity and noise.
> Just use a pair of JK flipflops (no external gates required to divide by
> 3 unlike when using D flipflops) configured to divide by 3 and extract
> the 10MHz component in the divider output.
> For one version of a JK fliflop divide by 3 circuit see:
> http://www.play-hookey.com/digital/frequency_dividers.html
This divider is actually a poor design if the 2 fliflops both have Q=0
(eg at startup or as the result of a transient) they stay in that state
forever (until powered down).
I should have checked for this, I'll find a better circuit that doesnt
have this undesirable behaviour.


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