Most switch mode supplies have transformers. The weight differences
reflects the difference between a large mass of laminated iron, and a,
small, ferrite toroid. Using a higher frequency allows a less bulky
transformer.
--
David Woolley
On 03/12/2023 04:54, David Gilbert wrote:
The ones I measured just a couple of months ago were way too small and
light to have a transformer in them, and they were horrible. In any
case, I recommend that anyone using a wall wart for other than its
intended equipment (or any standalone new one) be sure to check it for
both noise and no load voltage regulation. It's quick and easy to do
and could save a lot of headaches.
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