custom toroidal for low voltage AC input

Hi,

I'm in a quest to avoid mains into my preamp and dac chassis. I just thought I might buy a custom wound toroidal for 24V AC primary.
The power would come from a AC-AC wall wart, like this or this so, for instance, windings would be primary 0-24V, secondary 2* 0-9V and 2* 0-18V

First of all, is it even doable? I've never seen this mentioned as an option, and I've read several threads in this forum.

Thank you
 
Last edited:
A separate DC supply chassis with 120VAC input is better. Run DC lines to audio chassis, with local regulators and decoupling.
But if you want no touchable 120VAC inside any chassis, a properly sized AC/AC wall wart will work.
 
A separate DC supply chassis with 120VAC input is better. Run DC lines to audio chassis, with local regulators and decoupling.
But if you want no touchable 120VAC inside any chassis, a properly sized AC/AC wall wart will work.
sorry i do not want to touch mains, so no separate chassis with the power transformer to a DC umbilical.
 
The picture shows DC on the output. Dots under a solid line... Not to mention it's switching, not linear.
Maybe there are more than one type for sale in the listing.
In any case, if you don't want to "touch the mains" I suggest you use an off the shelf SMPS and make your design work with 12VDC
1667408879884.png