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

Fri Jan 6 16:02:24 UTC 2012

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,<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.
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>       Government is not healthy for children and other living things.
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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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