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

Peter Gottlieb nerd at verizon.net
Fri Jan 6 16:33:36 UTC 2012


   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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