Personally, I think the choice of LED display for such a project is a poor one. You can get LCD displays for less than $15 if you look a little bit, and the power consumption will be much lower, which will make a number of other things easier and the end product more desirable, such as being able to run on batteries, which would be well aligned with modern trends. For such a project, it seems that a TCXO approach makes more sense than an OCXO. The XO and its temperature compensation could be precalibrated against a known good reference, and the end product would be stable and have low power consumption. A simple microcontroller would divide the crystal, drive the LCD, and do the temperature compensation.
When is the due date for the project submissions? Didier KO4BB > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Murray Greenman > Sent: Thursday, November 29, 2007 4:58 PM > To: [EMAIL PROTECTED] > Cc: [email protected] > Subject: [time-nuts] Digital clock competition > > Philip, > > I am interested in your design challenge for an accurate > digital clock, but although I've searched the IEEE Spectrum > on-line magazine, I can find no mention of it. All I have is > an email from you circulated through the TimeNuts group. > > It will be important to know the ground rules for the > project. For example, what is the expected operating > environment? What is the power budget? Need the display be > 7-segment, and is any other technology permitted? Where, when > and how is the calibration to be performed, and over what > time period will accuracy be checked, and by what method? > > Most especially, we need to know what the definition of parts > being 'generally available' means, and we need to know who > decides how the cost of construction is defined. I published > a $30 design using recycled parts capable of 10sec/year some > two years ago - how would I know if it would it be eligible? > > Please send me detailed information, or tell me where I may > find it. If it's not been clearly defined then the > competition will not generate any serious interest. > > Regards, > > Murray Greenman > Senior Engineer, > Oscillator Engineering, > RAKON > > _______________________________________________ > 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.
