[Elecraft] Switching v. Linear Power Supplies

[Phil Wheeler]

I can't answer those questions directly, Rick.

With my K2/100 I use an Astron switcher.

There have been a couple of QST reviews of switchers in the last several 
years. Some are better than others.

73, Phil

Rick Lellinger wrote:

>Greetings,
>
>I've been working with electronics as a hobbyist for over twenty years and
>I've always powered my projects with linear power supplies.  I no longer
>have access to my heavy 30amp Astron supply and I'm considering an MFJ 13.8v
>25amp (#4225) switching supply (reduced weight and size). It will power both
>my K2 and a VHF radio. However, I am concerned about RF hash from the unit
>as well as ripple. I noticed that the MJF supply has a ripple figure of 35mv
>while a comparable Astron linear supply has a mere 5mv of ripple. The
>voltage regulation is fine, which is good.
>
>1. Has anyone used the MFJ 4225 switching supply with good results, that is
>decent regulation and NO hash (Rx OR TX) ?
>
>2. Is 35mv of ripple too high? I know that the K2 and most good radios
>contain excellent voltage regulating circuitry and so this may not be an
>issue.
>