Purchased a Leploop that comes with a 12v 400ma EU wall wart with a input of 230~50Hz, and an output of 12v~400ma. Would I be safe just getting just a simple little $5 EU to US adapter, or should I just purchase a whole new ac power adaptor to be safe?
Yep. I took my EU DN to the US and used a little cheap adaptor no problem. Also, bought a MacBook Air while I was there (Apple is so much cheaper in the US!) and that works fine back home in Europe too. TL;DR yes 
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Thanks a bunch buddy!
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Does it indicate that it can run off of US wall voltage? (110V)? Elektron (after Mk1) & Apple adapters are typically universal voltage
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I don’t see any thing on the adapter to indicate that it can.
I’d take that to mean it’s expecting EU voltage. The labelling is usually explicit
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That’s what the adapter looks like. Same brand. Just replace 9v with 12v 400ma.
Yeah, it would say 110-240V like this is if it could work with both (You’d just need the physical plug adapter)
If it just says 240V, it’s very unlikely to work with 110V, and I wouldn’t chance it.
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Right on gang. Glad I asked. Should a 12v US power supply work?
Once it’s got the right sized barrel jack and outputs 12V 400Ma, then yes.
Edit: That pic you posted is an AC/AC power supply. Is that what your device uses? Most things use DC power supply (Machinedrums being an exception in the Elektron world), and you cannot confuse the two.
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https://eu5.dh-cdn.net/uploads/db8181/original/3X/8/c/8cf021cdceb123f2c801021204bdb53180300839.jpeg
That’s it right there.
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Ok, AC/AC power supplies like that are harder to come by (ask anyone who’s lost/broke their Machinedrum one). Just be sure you’re getting the right thing.
AC/AC (very important!)
Input 110V
Output 12V 400Ma
And then whatever the correct barrel jack size is.
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Thanks so much for all your help.
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