I just power mine off an old 19vdc laptop supply dropped with a linear regulator (and filtered) to provide ~17vdc No 5vdc supply required for mine. I recall reading that some have an internal 5v regulator. I believe the way to check is if the lock pin signals and PPS is present without external 5vdc supply. Mine does. Your experience might vary - but that was my experience with my copy.
I also didn't have serial connected on mine. Had to mod it to bring out serial. Anybody else face that? - Brian On Tuesday, December 16, 2014, Ryan Stasel <[email protected]> wrote: > All, > > It's interesting, but I've actually found the FE-5680 I have will power > up, and lock, from just 12v. Sure, takes a bit longer, but it eliminates > the need for the 7812 in the box, etc. I know the 5680 FAQ on ko4bb ( > http://ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq#input_voltage_requirements_spec_is_15_-_18_volts_dc_and_5v_dc) > states they'll run as low as 9.96v, but I've always been curious if that > was AFTER the 15v lock, or from cold. > > Anyway, YMMV on any particular unit, but it would be interesting to hear > if anyone else is just powering them from a standard (linear) 12v wall > wart, or are you all just using 15v? > > -Ryan Stasel > > > On Dec 16, 2014, at 09:54 , Clint Turner <[email protected] <javascript:;>> > wrote: > > > > Hello, > > > > I've mounted both my LPRO-101 and FE-5680 in Hammond 1590-type cast > aluminum boxes, bolting the rubidium unit to the lid of said box, and found > the heat sinking of the entire arrangement to be entirely adequate. In > each case there is a (well filtered!) switching regulator present that > contributes little to the overall thermal load as well as allowing them to > run directly from a standard "12 volt" equipment bus. > > > > If you run the units at their minimum allowed voltage (19 volts for the > LPRO-101, 15 volts for the FE-5680, IIRC) they will dissipate much less > power as the regulators contained therein are linear type. It struck me > that at the lower limit voltages that they take slightly longer to warm up > and come online, but still somewhere around the 3 minute mark for a > "Physics Lock." > > > > Details may be found at: > > > > http://www.ka7oei.com/10meg_rubidium1.html - For the LPRO > > > > http://www.ka7oei.com/10_MHz_Rubidium_FE-5680A.html - For the '5680, > of course! > > > > 73, > > > > Clint > > KA7OEI > > > > > >> On 16 December 2014 at 12:16, Bob Camp<[email protected] <javascript:;>> > wrote: > >>> Hi > >>> > >>> One fairly important issue - the unit needs to be on a heat sink. If > you > >> run it without cooling of some sort, it will not run for very many > years. > >>> Bob > >> I do realize that, but how big? Normally "the bigger the better" is > >> not an unreasonable rule on heatsinks, but I have heard that cooling > >> these too much is bad. I have here a heatsink about 600 x 300 x 150 > >> mm, although I think that is a bit OTT !! > >> > >> Dave > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] <javascript:;> > > 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] <javascript:;> > 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.
