[Elecraft] K3 Power Supply

[Alan Bloom]

For those bothered by fan noise, you might look into my fan speed
controller article in February QST (p 44).  It's a very simple circuit
that gradually speeds up the fan as the temperature rises.  PC boards
are available from FAR circuits or you can just breadboard it on a scrap
of perf board.

It was designed for the MFJ-4125 but should work with minor modification
with any power supply that uses a 12V fan.

Al N1AL


On Sun, 2010-05-23 at 13:57 -0500, Edwin Johnson wrote:
> Hello Phil,
> 
> On Sun, 23 May 2010, elecraft-request at mailman.qth.net wrote:
> 
> > From: "Phil LaMarche" <plamarc1 at verizon.net>
> > Subject: [Elecraft] K3 Power Supply
> >
> > I have a 35 and 70 amp Astron PS for home use.  I want to buy a supply that
> > is light and nice for taking it on vacations etc.  Any recommendations?
> >
> > Phil
> 
> For several years I have been using an MFJ-4125 (6"x6"x2") with several 
> different rigs when portable. Fan noise is quite low, especially when you have 
> if off the same table as the rig, which is how I operate it. At the time I 
> bought it, several years ago, it had one of the best reviews of several 
> covered in QST for having no hash nor ripple. There is a more current review 
> in QST with other supplies having a few more features, but this unit is light 
> weight and very dependable.
> 
> ...Edwin
> ____________________________________________________________
> "Once you have flown, you will walk the earth with your eyes
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