[Elecraft] Noise from KAT500?

[David Woolley]

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.