Yes, that was my intention: I posted the VHDL of the TimeToDigital TIC I use. Next will be the PI controller. I hope this short roadmap will lead to the evolution of the Shera controller.
On Mon, May 14, 2012 at 4:37 AM, J. L. Trantham <[email protected]> wrote: > I have always been interested in trying to improve the look of the 'dead > bug' style. > > How about a small PCB with an 8 pin DIP connector that is used to mount the > oscillator, the divide by 4 and get power, ground and provide 24 MHz and 6 > MHz outputs to the 8 pin DIP. That way, the 'little module' plugs into the > original socket on the PCB. In addition, if the correct part ever becomes > available, it's just 'unplug and play'. > > Lot's more effort but it sure would look good. Might also allow for some > modifications to raise the 24 MHz and achieve smaller phase increment > corrections. > > Likewise, a module could be built to plug into U2 to provide for a 10 MHz > VCXO and with jumpers for whatever frequency VCXO you might choose. As > designed, the controller is good to 5 MHz or so. > > Come to think about it, is it time to think about a 21'st century Shera > Controller re-design? Or has the TBolt made that obsolete? > > Joe > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of [email protected] > Sent: Sunday, May 13, 2012 9:08 PM > To: [email protected]; Time-Nuts > Subject: Re: [time-nuts] Shera Controller - U7 > > A 74AC74 in SO-14 package mounted dead bug style will make a handy /4 that > is no bigger than most crystal oscillators. > > If that's still too big, you can go with the TSSOP, but no coffee for you > for a week prior to soldering that baby :) > > Didier KO4BB > > Sent from my BlackBerry Wireless thingy while I do other things... > > -----Original Message----- > From: "Kevin Staley" <[email protected]> > Sender: [email protected] > Date: Sun, 13 May 2012 17:27:20 > To: 'Discussion of precise time and frequency > measurement'<[email protected]> > Reply-To: [email protected], > Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] Shera Controller - U7 > > Hi all > Thanks for the many responses. > It would seem that U7 is pretty rare. > I think I will be going with a 24 MHz "Can oscillator" and a separate 6MHz > source for the PIC either divided from the 24MHz oscillator or a separate > oscillator. > > Thanks again > Kevin > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Chris Albertson > Sent: 13 May 2012 16:47 > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Shera Controller - U7 > > On Sun, May 13, 2012 at 8:11 AM, J. L. Trantham <[email protected]> wrote: > > It is an 8 pin DIP, 24 MHz oscillator with an onboard divide output in > > order to provide a dual output oscillator. It is an ECS-300CX-240 and > > DigiKey lists it as obsolete since 2009. They say 'call'. > > Sounds like a you could use a normal 24MHz TTL can oscillator and a dual > flip flop mounted "dead bug" style. > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > 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.
