[time-nuts] Temperature and signal amp for 'Bay FE-5680A?
paul swed
paulswedb at gmail.com
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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>>>
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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
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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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