Hi Bob, I hooked the big voltmeter up to it, and it shows +4.2V out for about a minute, and then goes to 0. Looking on the web, it seems like I can use that to drive a 2N2222 and put the LED and dropping resistor in the collector path with the emitter to ground? Does that sound right?
Bob >________________________________ > From: Bob Camp <li...@rtty.us> >To: Discussion of precise time and frequency measurement <time-nuts@febo.com> >Sent: Saturday, September 21, 2013 4:12 PM >Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator > > >Hi > >Those readings sound a lot more like a CMOS gate output than some sort of open >drain / open collector discrete driver. > >Bob > > >On Sep 21, 2013, at 4:43 PM, Bob Stewart <b...@evoria.net> wrote: > >> Hi Bob, >> >> It's rather curious. Using my handheld DVM in the diode scale, I get a >> reading of 448 in one direction and 458 in the other with it off and cold. >> In the 2K ohms scale, I get 561 and 562 ohms. Later on, I'll pop the top >> off again and take a pic so I can expand it and look at it. For what it's >> worth, my DDS board is 2 revisions earlier than the one Matthias Bopp >> modifies here >> "http://www.dd1us.de/Downloads/precise%20reference%20frequency%20rev%201_0.pdf"; >> >> Bob >> >> >> >> >> >>> ________________________________ >>> From: Bob Camp <li...@rtty.us> >>> To: Discussion of precise time and frequency measurement >>> <time-nuts@febo.com> >>> Sent: Saturday, September 21, 2013 3:00 PM >>> Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator >>> >>> >>> Hi >>> >>> As far as I know the lock output is a CMOS output that will drive a couple >>> of ma. There are so many variations that yours may indeed be an open >>> collector and good to +15 volts. >>> >>> Bob >>> >>> On Sep 21, 2013, at 10:55 AM, Bob Stewart <b...@evoria.net> wrote: >>> >>>> The instructions I got with this Rb said that you could hook an LED >>>> through a 5-10K resistor to the +15 supply and get a lock indication. I'm >>>> using a 10K resistor and the LED lights as soon as it's powered up from >>>> cold. Is the loop lock indicator circuit broken or is it just another >>>> strange option for these things? I saw on one site that if you do it this >>>> way it prevents lock, but mine seems to lock OK with or without the >>>> voltage. >>>> >>>> >>>> Bob - AE6RV >>>> _______________________________________________ >>>> 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. >>> >>> >>> >> _______________________________________________ >> 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. > > > _______________________________________________ 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.
