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,<[email protected]> wrote:
l<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.
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