Hi:
The Twisted Johnson Ring Counter may be the one your looking for.
The individual stages are not clocked at the input frequency, but rather
something like N/5.
http://en.wikipedia.org/wiki/Ring_counter#Four-bit_ring_counter_sequences
It's decodes using 2-input gates.
The last one I made used the 723 F-F from Fairchild.
http://www.prc68.com/I/comp.shtml#Lamp
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Tim Shoppa wrote:
Yes! I did find a patent that illustrated the exact same feedback circuit
as in the EE times article. But most self-decoding ring counters in
mass-produced applications use simpler lower propagation-delay gate
arrangements to ensure the counter self-corrects any defective sequences.
e.g. look at how the CD4017 does not use a 10 input NAND gate!!!
Tim N3QE
On Fri, Nov 14, 2014 at 4:39 PM, Said Jackson via time-nuts <
time-nuts@febo.com> wrote:
The premise of higher than "normal" click speed is false in the article
too because the complex NOR gate is slow with that many inputs, and its tpd
needs to be added to the Tsu and Tco of the flip flop chains, as well as
the pcb propagation delays through the worst case trace..
It would have been faster to simply use a single reset RC delay to reset
all FF asynchronously while only setting one FF at the same time during
power-on. That would remove the Nor gate delay from the max speed
calculation..
Sent From iPhone
On Nov 14, 2014, at 12:13, "Don Latham" <d...@montana.com> wrote:
Thanks. You reminded me of the time when <design ideas> really had
content. No
more, I'm afraid...
Don
Azelio Boriani
No need to digitize, the article is available here:
<
http://www.edn.com/design/test-and-measurement/4347165/Circuit-divides-frequency-by-N-1
or here (in .PDF):
ftp://ztchs.p.lodz.pl/PRP/PRP_2006_2007/71102di.pdf
On Fri, Nov 14, 2014 at 8:02 AM, Perry Sandeen via time-nuts
<time-nuts@febo.com> wrote:
List,
I’ve digitized and edited an article titled* Circuit DividesFrequency
by N+1
by Bert Erickson, Fayetteville, NY from EDN 7/11/2002*.
Essentially, this circuit is expandable and allows for adivision by any
number plus one.
Anyone who wants a PDF copy please send me an original emailoff list.
Regards,
Perrier
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--
"The power of accurate observation is commonly called cynicism by those
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have not got it."
-George Bernard Shaw
Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
Huson, MT, 59846
mail: POBox 404
Frenchtown MT 59834-0404
VOX 406-626-4304
Skype: buffler2
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