[Elecraft] Switching vs Linear Power Supplies

[Joseph Reed]

Noise aside, I have two big honking linear power supplies and a switching supply of the same rating.  No difference except you don't risk a hernia when you move the switcher.

Some folks will say the linear is quieter.  But in an urban environment you can't tell the difference.  Noise is everywhere.

To answer your question directly - No.  They both do the same job.  But not all switchers are made equal.  Some are very noisy, others make a concious effort to minimize noise.  My Astron switcher is very quiet, and I have never noticed the fan as it is about 4 feet from the operating position.   Your mileage may vary depending on how close you place it.

Joe N9JR

----- Original Message ----
From: Jack Regan <ae6gc at sbcglobal.net>
To: elecraft at mailman.qth.net
Sent: Wednesday, October 3, 2007 9:08:47 PM
Subject: [Elecraft] Switching vs Linear Power Supplies


I am moving my shack to a new location and was considering repacing my Astron 70M  (70 amps with meters)with something smaller.

I saw some small switching supplies that seemed to do what I wanted but they all have fans.  The last thing I want is more noise in my shack.

Anyway, is there any advantage to a switching power supply (with a fan) vs a linear supply (with no fan) other than the size and weight?

Jack, AE6GC
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