[time-nuts] Power supply for 'Bay FE-5680A?

Fri Jan 6 18:51:11 UTC 2012

I just grabbed something I had around it is a 24 V 0.1 A.  I run  at 15 V, 
dimensions are 80X80X24 mm I just bought some 80X80X10 mm and I am sure  
they will work as well.  There are so many choices I recently bought a new  one 
with integrated heat sink and tried it on a FRS all for $  6 shipping  
included.
Attached are two circuits I use, the top one since I did not have a PC  
board. I now have a board and I used in an other application the two stage one  
and if you use a heat sink I recommend replacing the feedback resistor on 
stage  two with a capacitor.
Bert Kehren

In a message dated 1/6/2012 1:16:01 P.M. Eastern Standard Time,  
nerd at verizon.net writes:

What  kind of temperature controlled fan did you use?

On 01/06/12,  EWKehren at aol.com wrote:

I do not understand why this is even discussed.  Running at lower 
temperature will extend life and using a fan with  temperature control will 
cost no 
more than $ 12 and I challenge any of you  how I can get for so little 
money 
more than one order of magnitude  improvement. As I reported before I 
started 
out with heat sink only and  quickly realized that I would not be able to 
measure aging because the  last 2 digits where all over the place and 
unless 
you have an environment  where your lab is within 0.1C you are throwing 
away the real advantage of  a Rb.
I did enclose the Rb cell and the OCXO on a FEI 5962B, its modularity  
lends 
it self for such testing, it was not worth the effort and the power  saving 
was minimal.
Once my aging tests are completed I will test for  15 V voltage sensitivity.
Bert Kehren

In a message dated  1/6/2012 11:35:02 A.M. Eastern Standard Time, 
nerd at verizon.net  writes:

A heat sink may not be required, per se, although I would  expect that a
larger thermal mass and/or thermal regulation via a closed  loop fan
controller will help smooth out/stabilize temperature  effects.

On 01/06/12, Chuck Forsberg WA7KGX  N2469R<caf at omen.com> wrote:

The Tech Manual does not call for  heat sinking (unless I missed
something).
The top has labels over much  of the surface.
The bottom has a plastic sheet between the circuitry and  bottom plate.
It appears the unit was expected to be rather hot when  running.
I have mine mounted on the out side of the box using  standoffs.
On 01/06/2012 07:39 AM, Bob Smither wrote:
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> Chris Albertson  wrote:
>> On Thu, Jan 5, 2012 at 6:11  PM,<[1]time-nuts at custodes.info> wrote:
>>
>>>  l<[2]http://www.freqelec.com/rb_osc_fe5680a.html> says 32W peak,
but  then
>>> also 15-18v at 700mA, which doesn't make  sense.
>>
>> It will pull 35W for the first five or so  minutes then the current
drops
>> rather suddenly to about  700mA.
>>
>> I have an analog amp meter on my power supply  and I can see a switch
over
>> after the unit heats up. They must  run an internal oven heater full
tilt
>> at first then go into  regulated mode.
>>
>> Some one else said you can cause the  FE5680 to draw more power in
steady
>> state mode by adding heat  sinking it. Yes that works. Seems the
FE5680
>> wants to be at  some set temperature and the heat sink means it takes
more
>>  power to keep at the set point. I just let the fe5680 rest on  a
small
>> aluminum plate.
> Have you measured the case  temperature of your FE5680?
>
> I put mine on a heat sink and the  case temperature stays around 50C.
Without
> the heat sink it was  around 60C. Does anyone know what temperature is
> recommended? The 50C  seems a little hot, but the unit appears to work
well.
>
> -  --
> Bob Smither, PhD Circuit Concepts,  Inc.
>
=======================================================================
==
>  Government is not healthy for children and other living things.
> --  Jeff  Daiell
>
=======================================================================
==
>  [3]Smither at C-C-I.Com [4]http://www.C-C-I.Com  281-331-2744(office)
-4616(fax)
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--
Chuck Forsberg WA7KGX N2469R  [8]caf at omen.com [9]www.omen.com
Developer of Industrial ZMODEM(Tm) for  Embedded Applications
Omen Technology Inc "The High Reliability  Software"
10255 NW Old Cornelius Pass Portland OR 97231  503-614-0430
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References

1.  mailto:time-nuts at custodes.info
2.  http://www.freqelec.com/rb_osc_fe5680a.html
3.  mailto:Smither at C-C-I.Com
4. http://www.C-C-I.Com/
5.  http://enigmail.mozdev.org/
6. mailto:time-nuts at febo.com
7.  https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
8.  mailto:caf at omen.com
9. http://www.omen.com/
10.  mailto:time-nuts at febo.com
11.  https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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