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

Bob Smither smither at c-c-i.com
Fri Jan 6 15:39:50 UTC 2012


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Chris Albertson wrote:
> On Thu, Jan 5, 2012 at 6:11 PM, <time-nuts at custodes.info> wrote:
> 
>> l <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
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Smither at C-C-I.Com  http://www.C-C-I.Com  281-331-2744(office)  -4616(fax)
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