[time-nuts] Temperature and signal amp for 'Bay FE-5680A?

Sat Jan 7 16:39:32 UTC 2012

Ah, thanks, that was enough to get me thinking, to pull me away from my 
job's problems and back to the fun side.

I just replaced my wife's computer, and old obsolete big Dell box, with 
a sleek new (and much faster) laptop.  I was about to throw out the old 
box but now have a use for the large CPU heatsink/fan assembly.  I will 
mount the FE-5680A to an aluminum plate and then to the heatsink.  I 
don't need the plate thermally, but it makes the mechanical mounting 
much easier.  I'll use some thermally conductive pads between things.  I 
will use something like the circuit you provided (thank you), I have a 
bunch of those TO-92 temperature sensors with wires attached, more 
surplus from work, and then will mount the whole thing with power supply 
into a box where I can set up the air flow like I want.

So, here's a question.  One app is a rack of gear which all needs to get 
the 10 MHz.  I could just go find some distribution amp, but I would 
prefer to build something.  Has anyone done this?  I was thinking 
perhaps a good solid reasonably high power op amp buffer feeding 
resistors to each output to each piece of gear?  Anyone done this and 
found any "gotchas" or success stories?

Peter

On 1/6/2012 1:51 PM, EWKehren at aol.com wrote:
> 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:
>> -----BEGIN  PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> 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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>>
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>>
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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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