[time-nuts] Division Circuit

Mike Feher mfeher at eozinc.com
Sat Nov 15 11:26:33 EST 2014


Brooke -

You must have meant the 923. The 723 is a voltage regulator. I also used to have fun with the 900 series RTL stuff in the mid 60's. 73 - Mike 

Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Brooke Clarke
Sent: Friday, November 14, 2014 6:10 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Division Circuit

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 at 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" <djl at 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-divide
>> s-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 at 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
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to 
>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>>> and follow the instructions there.
>>>> _______________________________________________
>>>> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>> and follow the instructions there.
>>>
>>> --
>>> "The power of accurate observation is commonly called cynicism by 
>>> those
>> who
>>> 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
>>> www.lightningforensics.com
>>> www.sixmilesystems.com
>>>
>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to 
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>

_______________________________________________
time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.



More information about the time-nuts mailing list