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, ewkeh...@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,
n...@verizon.net writes:
What kind of temperature controlled fan did you use?
On 01/06/12, ewkeh...@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,
n...@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<c...@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-n...@custodes.info> wrote:
l<[2]http://www.freqelec.com/rb_osc_fe5680a.html> says 32W peak,
but then
also 15-18v@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]smit...@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]c...@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-n...@custodes.info
2. http://www.freqelec.com/rb_osc_fe5680a.html
3. mailto:smit...@c-c-i.com
4. http://www.C-C-I.Com/
5. http://enigmail.mozdev.org/
6. mailto:time-nuts@febo.com
7. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
8. mailto:c...@omen.com
9. http://www.omen.com/
10. mailto:time-nuts@febo.com
11. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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