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:[email protected]] 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 < > [email protected]> 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" <[email protected]> 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 >>>> <[email protected]> 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 -- [email protected] To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] 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 -- [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
