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
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