I have posted this many times in the past but the Cotek (Samlex)
S150/S300 series of inverters are extremely quiet. They are heavy,
generate a 60Hz sine wave (not a digitally pulse width version of a sine
wave) and not inexpensive. I have an S300-112 (300W, 12V to 120VAC)
which exceeds FCC part 15 class B by quite a bit as measured with a LISN
and a spectrum analyzer with the proper bandwidth and quasi-peak
detector. I know a guy at Cotek who told me that these inverters were
intended initially for ambulance service powering medical equipment but
are available from many internet suppliers.
You probably won't like this unit as it is not small (9.33" x 6.10" x
2.83" and weighs 7.7lbs.) but I highly doubt you could make something
better/quieter in the same size package. About 75% of the interior is
occupied by the 60Hz toroidal transformer. The case is aluminum and
doubles as a heat sink for the FETs and provides shielding. The unit
runs very cool and the quiescent current is 26mA when on and nothing is
drawing a load.
73,
Larry, W0QE
On 3/21/2014 11:16 AM, Kenneth G. Gordon wrote:
Well, it looks like I didn't address my original question to the list
correctly, so
here goes again.
Does anyone here know of a small 12VDC to 110VAC inverter that is 1) NOT
noisy, RF wise, and 2) outputs a real sine wave?
It would not have to output more than 100 watts.
If not, I'll have to design and build my own, or use a dynamotor and following
circuitry to get what I need: 75 VDC at a few mA and ~2.0 VDC at 900 mA.
Kenneth G. Gordon W7EKB
"Courage is being scared to death but saddling up anyway."--- John Wayne
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