[time-nuts] FE-5680A Voltage?

Bob Stewart bob at evoria.net
Thu Sep 12 21:28:12 EDT 2013


I hadn't given it any thought.  I saw some ad that said 1.5 volts so I assumed that.  But, after looking through the datasheet I see an  efficiency figure of  73 percent for the adjustable one, so that does imply a need for about 20.5 volts.  OTOH, it says the feedback voltage is 1.23V, so I dunno.  And I'm certainly not pretending I have any electrical design skills.   I'll find out.  =)

Bob




>________________________________
> From: Bob Camp <lists at rtty.us>
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Thursday, September 12, 2013 7:54 PM
>Subject: Re: [time-nuts] FE-5680A Voltage?
> 
>
>Hi
>
>Looking at the 2496 data sheet - you probably want to put something > 20 volts into the board if you want a reasonable 15 volts out of it.
>
>Bob
>
>On Sep 12, 2013, at 8:01 PM, Bob Stewart <bob at evoria.net> wrote:
>
>> I just remembered:  Someone here or on the Agilent list suggested I buy a handful of those LM2596 buckboards a few weeks ago.   That one wallwart should have enough headroom to give me 15V.
>> 
>> Bob
>> 
>> 
>> 
>> 
>> 
>>> ________________________________
>>> From: Bob Camp <lists at rtty.us>
>>> To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>>> Sent: Thursday, September 12, 2013 4:52 PM
>>> Subject: Re: [time-nuts] FE-5680A Voltage?
>>> 
>>> 
>>> Hi
>>> 
>>> As I recall, 15 volts is sort of the minimum they recommend on most of the variations of the 5680. The internal regulators will probably be happier with 18 volts than with 14.25. You best bet is indeed a 15 V supply. 
>>> 
>>> Bob
>>> 
>>> On Sep 12, 2013, at 11:03 AM, Bob Stewart <bob at evoria.net> wrote:
>>> 
>>>> I decided to order a Rb standard, and I was wondering what the lower limit on the 15V power requirement is?  I have a PSU that will go up to 14.25V and my next closest is 18V.  Should I just get a new 15V PSU before this gets in?  Maybe I can make a quick mod on the big one and take it up to 15V.
>>>> 
>>>> Bob - AE6RV
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