Jeff If you do a web search for frequency divider or standard, there are several good home brew type projects that are relatively simple and straight forward. Below are some of the sites I have visited. The first 2 explain more on the tech end and the last is a public domain schematic of a relatively simple divider. 2 more dividers would have to be added to get 1pps with a 1mhz input. I've seen the 390 chip used elsewhere and seems to work without a bunch of external components. Of course, all vcc lines to the chips should have capacitors to ground on all the chips. These are not normally shown or maybe they didn't use them.
http://www.play-hookey.com/digital/ www.techlib.com/files/dividers.pdf http://www.g7ltt.com/10mhz/freqstd3.jpeg Good Luck Rix -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of jshank Sent: Tuesday, November 27, 2007 8:23 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] 1Mhz to 1 PPS Hi, I would like to convert a 1 MHz sine wave to a 1 pps TTL. Any suggestions? Thanks, Jeff _______________________________________________ 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.