[Elecraft] K3/0 power

[Edward R Cole]

I have checked many of these "wall warts" and unloaded many so called 
12v unit output as high as 18v.  They seem to be a simple transformer 
and diode if rated for dc.

One way they can safely be used with a varying load is to charge a 
battery which then powers the electronics.  A battery looks like a 
big capacitor to such supplies and provides a constant load plus 
filters out ac ripple.  Added plus is the equipment is provided with 
emergency power for short outages.

I run my 10-MHz station frequency standard (OCXO) with a wall wart 
charging a Powersonics 17AH battery.  Ensures that the OCXO is not 
frequency modulated by small ripple voltage, plus the OCXO is 
stabilized since it runs 24/7.

73, Ed - KL7UW