Hi Ronald: Not yet. Right now I'm having fun with old DC motors and Flashlights. http://www.prc68.com/I/EM_ToyEngine.shtml http://www.prc68.com/I/Gilbert-Motor.shtml http://www.prc68.com/I/Weeden-El-Motor.shtml http://www.prc68.com/I/FlashlightPat.shtml
Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam Ronald Held wrote: > Brooke: > Have you tried out your last idea at least in a test configuration? > Ronald > > > > > Message: 1 > Date: Fri, 28 Dec 2007 15:19:49 -0800 > From: Brooke Clarke <[EMAIL PROTECTED]> > Subject: Re: [time-nuts] accurate portable time source > To: Discussion of precise time and frequency measurement > <> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=us-ascii; format=flowed > > Hi Ronald: > > Here are a some of ideas for the heart beat for a LCD based clock like the > ones > I've been developing. > > Best) A Vectron EX-380 series Vacuum OCXO only draws 0.35 Watts and if the 5 > volt version that's only 70 ma. So a single AA would have enough energy, > three > AAA Ni-MH would be great. That was the good news. The bad news is that they > are made of unobtanium (i.e. very expensive or need to be bought in large > lots). > > Good) An alternative is the DS3231. This is an advanced version of the > DS32khz > TCXO and is adjustable to 0.1 ppm using the digital serial interface. > Provision for a coin cell back up battery. > > unknown) One of the DS3231 parts, in a thermal enclosure that has a time > constant in excess of 24 hours. I think it's about the size you request. A > temperature sensor changes the divisor based on calibration data. Sort of a > doubly compensated device TTCXO or T2XO. I like this one for a > practical product. > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.precisionclock.com > http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam > > _______________________________________________ > time-nuts mailing list -- time-nuts@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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.