Hi Didier, That link didn't work. Can you check and re-send?
Thanks. Rob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: 20 January 2012 16:48 To: Time-Nuts Subject: Re: [time-nuts] 15 volt power supply for FE-5680A on eBay I started a wiki page with the pin-out information ans was planning to copy the most interesting posts, but I do not have one, so the incentive is pretty low at this point. If you want to do it, be my guest. http://wwwmko4bb.com/dokuwiki/doku.php Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: [email protected] Sender: [email protected] Date: Thu, 19 Jan 2012 06:34:13 To: <[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] 15 volt power supply for FE-5680A on eBay Pete Thank you this is valuable info. I noticed that an effort is underway to centralize info on the 5680. Would be nice if some one with time and software expertize would combine all the information. I cut and paste what ever I find on the list and will be glad to forward it to a volunteer. This kind of findings should be included. Bert Kehren In a message dated 1/18/2012 8:47:54 P.M. Eastern Standard Time, [email protected] writes: One of the regulators (the one that runs the lamp and lamp heater) is running at 13.8V and has a 500mV dropout voltage, so there is very little (~ 700mV) headroom. The one that runs the cell heater is about a volt lower and the one that runs the analog circuits is set to 8.8V, so has plenty of headroom. I suspect the lamp regulator is mostly there to reduce the start-up current, though - the FE-5650 has a very similar lamp circuit with no regulator and the only significant difference seems to be that the current pulled when the unit is cold is higher. Regards, Pete Bell On Thu, Jan 19, 2012 at 8:19 AM, paul swed <[email protected]> wrote: > I think it is important. The specs say 15-18V. > So I would not drop below the spec. Though interestingly pretty much > everything inside the system is using switching supplies so perhaps > there is more room. > The gtood thing about the switchers is that as the input V goes up current > should go down if that helps you. > Regards > Paul. > > On Wed, Jan 18, 2012 at 6:25 PM, Chris Albertson > <[email protected]>wrote: > >> I used a variable voltage bench supply to experiment. tried low >> voltage like you are seeing on my FE5680 and I never got a lock. The >> FE5680A spec sheet says 15 to 18 volts and I think you can get buy >> with 14.5V. i tried 12.5 and got "nothing" >> >> I did not test to find the "breaking point" But 1/2 volt low was >> OK and 2.5V low was not ok. >> >> What I bought is a 15V open frame supply from allelectronics.com for >> $11.50. It turned out to be a very high quality power supply (Digikey >> has the same unit for almost $40) This PS does not drop volts even >> with the line input and load well out of spec (I tested 63VAC input >> to a 4A load briefly) I added an RF "hash" filter "just because I >> could" and then an LM7805 and I think I'm OK. >> >> I thought about making a linear supply for the cleanest power but i >> intend to run this 24x7 and don't like wasting so much power. >> >> This is the one I bought >> >> http://www.allelectronics.com/make-a-store/item/PS-152/15VDC-2.7A-POWER-SUPP LY/1.html >> >> >> On Wed, Jan 18, 2012 at 3:05 PM, Paul F. Sehorne <[email protected]> wrote: >> > How important is the 15vdc at the initial startup 2amp, and then >> > how important at the .7 amp settled rate? >> > >> > I just received two of these >> > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280439877318 >> > >> > Unloaded voltage is ~15.5vdc. At 700 ma voltage drops to 14.3 >> > volts and >> > with 2 amp load drops to 13.3 volts with a 2 amp load (and to 10 >> > volts >> with >> > a 5 amp load). Supposedly rated at 6 amps. I have only checked >> > one, >> have >> > not broken the packaging on the second one assuming its >> > performance will >> be >> > similar. >> > >> > Will this be a problem? >> > >> > Paul >> > >> > _______________________________________________ >> > 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. >> >> >> >> -- >> >> Chris Albertson >> Redondo Beach, California >> >> _______________________________________________ >> 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. _______________________________________________ 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. _______________________________________________ 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.
