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I have the MFJ-4245MV sitting on the back of my desk. It provides power f=
or=20
my 100 watt Ham Transceiver and whatever else I might be inclined to add =
to=20
it. It is light  weight and quiet in spite of the fact that the fan has b=
een=20
stuck on since the BIG lightning strike the equipment took several years=20
ago.

You can buy a power supply that is too big but I don't think you can buy =
too=20
much capacity.

John Ferrell    W8CCW

"All that is necessary for the triumph of evil is for good men to do=20
nothing." -- Edmund Burke
http://DixieNC.US

----- Original Message -----=20
From: "gardenyu" <gardenyu2004@hotmail.com>
To: <piclist@mit.edu>
Sent: Friday, April 18, 2008 12:32 PM
Subject: [EE]how does a power supply provide current limiting function


>
> Recently I'm purchasing some power supplies. What surprises me is that =
for=20
> some very similar power supplies, MFJ-4225MV
>
> http://www.mfjenterprises.com/Product.php?productid=3DMFJ-4225MV
>
> and VS35M
>
> http://www.astroncorp.com/linear.shtml
>
>
> The latter one has an adjustable current limiting function while the=20
> previous one has not. The rest are quite similar. The latter one is a 2=
9=20
> lb and the previous one is only 3.7 lb! The dimension is also doubled.
>
> What makes this big difference, the MFJ one does not have a transformer=
=20
> inside?
> _________________________________________________________________
> =D3=C3=CA=D6=BB=FAMSN=C1=C4=CC=EC=D0=B4=D3=CA=BC=FE=BF=B4=BF=D5=BC=E4=A3=
=AC=CE=DE=CF=DE=B9=B5=CD=A8=A3=AC=B7=D6=CF=ED=BE=AB=B2=CA=A3=A1
> http://mobile.msn.com.cn/


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> --=20
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> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>=20



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