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I've found an european AC/AC adapter at home, and looks like it meets the requirements!
Would this be Ok to use with this headphone amp and/or which problems could I have? Thanks!
Is audio equipment considered I.T.E.?
I assume your wall outlet output is 220V-240V and not 110-120V (USA). If not it'd be very bad to use that.
(fairly confident but not 100% in what I'm saying)
If MassDrop (or who ever made it) used the parts outlined in NwAvGuy guide (the amp designer), 13.5V to 20V AC is the input for the amp (which is the output of the adapter for clarity). 600mA should be more than enough current at any volume any headphone. However, a higher number could mean better/smoother regulation-but I doubt it'd be audible.
18V (slightly higher than 15V) puts a higher stress on the power supply filter caps (inside amp). The voltage regulators will also heat up more, which changes things a slight bit but shouldn't damage anything. Semi conductors can take more and more heat practically forever right up to the point you run it just a smidgen too hot causing catastrophic failure.
Higher voltage could mean shortened life of the amp- but probably not by much. Cap life expectancy is mainly a function of voltage and temperature I think. Just don't use O2 amp inside an oven. I'd explain more but I have to go >.>.
The 120V and 220V versions depends on what your wall outlet supplies. 120V for US and 220V EU as far as I know.
If you get the wrong version (adapter) only bad things can happen.
So both standard versions are the same only the Power brick is different? So I could get the 220V one and swap a 120V brick to use instead?
As far as I know, yes. The recommended adapter's output is "15V AC" which O2's use.
If you're in the US, you could use the 120V AC to 15V AC adapter. If you're traveling in EU, you can use the same O2 and use 220V AC to 15V AC adapter.
If you use 120V to 15V adapter in EU, the adapter output will actually be closer to 30V and fry your O2.
If you use 220V to 15V adapter in US, the output will actually be closer to 7.5V and if the amp even works, it probably won't sound right.
I've crossed used adapters my whole life and never broke anything
Is this a DC output adapter or an AC output adapter? (Looks like DC)