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Wall wart with dual output (ideally 12 and 5) (found one!)
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kristakis:
I'm thinking about a little project that'll use 12V and 5V and rather than a relatively large PSU brick or buck converter I was wondering if there were any wall wart style plug packs around that had dual outputs. I've seen multi-voltage single outputs and wonder if I could cheat something out of that with some diodes but before I go popping silicon in my room thought I'd check if anyone had seen anything like that around.

tia,
kris

edit: I forgot that USB-C allows for 12V and I found a plug pack with USB-A and USB-C outputs which will do nicely! I can't delete this post so I'll put this note here instead. I need a rubber ducky
mariush:
The USB chargers don't output both 12v and 5v at the same time.  By default they output 5v and you can have a chip inside the product which negotiates with the charger and switches the voltage to other voltages like 12v.

There are power supplies that output 2 or more voltages but usually come with DIN connectors or other connectors (like miniature pci-e connectors, like the ones on video card)

But it will be easier to use a 12v only adapter with a barrel jack connector, and just add a 12v to 5v switching regulator inside the product, or a linear regulator if the current you need is very low on 5v.

Haenk:
A lot of older HDD enclosures use a 5V/12V PSU (wall wart), using a Mini-DIN-Plug. They should be easy to source on ebay etc.
NiHaoMike:

--- Quote from: mariush on November 14, 2023, 05:47:57 am ---The USB chargers don't output both 12v and 5v at the same time.  By default they output 5v and you can have a chip inside the product which negotiates with the charger and switches the voltage to other voltages like 12v.

--- End quote ---
Could use one that has both a USB-C and USB-A output with the C set to 12V and the A used as is for 5V. Janky but those chargers are cheap enough nowadays. Of course, adding a buck converter for 5V is far more elegant.
Alex Eisenhut:
Wall wart with dual DC outputs? Well, they existed... Very unusual even when they were still made
https://www.radwell.ca/en-CA/Buy/ELPAC/ELPAC/WM113/
But this might be a lead for more current parts
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