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

Sat Jan 7 17:10:25 UTC 2012

Sure have and a gain of 2 typically. Though if its 10 Mhz, not sure how
well that will work.
I was doing 5 Mhz at the time and also using buffer amps I think they were
LH0036 or 18s. Essentially a gain of 2 stage feeding numbers of buffers.
Downside of the approach is that the linear buffer amps suck power.
Since I prefer lower power I evolved over the years.
Regards
Paul.

On Sat, Jan 7, 2012 at 11:39 AM, Peter Gottlieb <nerd at verizon.net> wrote:

> 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<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"
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>> References
>>
>> 1.  mailto:time-nuts at custodes.info
>> 2.  http://www.freqelec.com/rb_**osc_fe5680a.html<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<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
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