[time-nuts] 15 volt power supply for FE-5680A on eBay
Rob Kimberley
robkimberley at btinternet.com
Fri Jan 20 16:51:15 UTC 2012
Hi Didier,
That link didn't work. Can you check and re-send?
Thanks.
Rob
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of shalimr9 at gmail.com
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: EWKehren at aol.com
Sender: time-nuts-bounces at febo.com
Date: Thu, 19 Jan 2012 06:34:13
To: <time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
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,
bell.peter at gmail.com 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 <paulswedb at gmail.com> 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
> <albertson.chris at gmail.com>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 <paul at sehorne.org>
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 -- time-nuts at febo.com 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 -- time-nuts at febo.com To unsubscribe, go to
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