I don't know if the Filter options are any better on a pc than on a smartphone but it is impossible to select a transformer from LCSC Power Transformers pages without carefully studying the images to reject any that are obviously ferrite cored and then downloading the datasheet for each one that looks like it might be a mains transformer. Even then the most likely looking ones from VACS are so poorly documented that they do not state input voltage ranges. There is nothing there that has anything like a suitable turns ratio. However, you need to clarify the statement: "...step down 220V AC or DC to 12 to 6..." Do you mean 220V to 12V AND 6V or 220V to 12V OR 6V? I suggest you look elsewhere and be prepared to assemble the transformer onto the PCB yourself: [https://www\.bitsbox\.co\.uk/index\.php?main\_page=advanced\_search\_result&search\_in\_description=1&keyword=Transformer](https://www.bitsbox.co.uk/index.php?main_page=advanced_search_result&search_in_description=1&keyword=Transformer)<br> <br> Or RS Online, Farnell, Newark, Mouser, Digikey, etc.

@nesnah.daniel, You aldo need to specify secondary current(s) or VA ratings.

@nesnah.daniel, Had a deeper search: I could not find any mains transformers on the LCSC or JLCPCB sites.

Stocking 50/60Hz transformers would throw up a lot of legal issues now they are illegal to export to certain countries.  Use a switcher.

@MikeDB, "... 50/60Hz transformers ... are illegal to export to certain countries." Any chance you could post a link with more information about this?

There numerous bits about the web.  Australia was one of the first I believe.  Rob Elliot blasted it on his website [https://sound-au.com/articles/external-psu.htm](https://sound-au.com/articles/external-psu.htm) They're not completely banned of course if you need AC - AC, but using them in electronic products is moreorless out there. I think UAE was another early mover in that direction. Rather than an outright ban, the EU and UK are gradually tightening up the requirements on efficiency and harmonic distortion making it harder to comply. <br> <br>