I have tried searching for one but I cannot find any. I am describing a headphone that allows two input sources. For example, it can allow you to listen to two iPods. But I have a specific scenario: I want to listen to a CD recording while simultaneously playing my digital piano through a headphone. This is good for practicing some music.
How difficult can it be to make one of these? It can be as simple as a headphone with two "speakers" for the two inputs on each side.
I also think it would have a basic, with three modes: play input 1 only, play input 2 only, and play both inputs. Advanced models would have volume controls for each source.
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Can't you do this with a mixer?
seems to me you could solder-yourself up a little y-connector with radio-shack parts and it would work. I can't see any reason why it woundn't. Might not do the amplifiers too much good to see the power from the other device, but if you kept the volume low, I don't think they would hurt each other. The speaker should play both okay.
But I haven't tried it, so don't take this as gospel.
I expect the reason you don't see this is that it is sort of a special--no demand. Most musicians I know actually play out loud.
with individual speakers this could work, but otherwise it actually does take some real circuitry, simply combining the two signals is a bad idea, it works, but it is horrible for your devices. think about it, the signal is a sine wave, with no constant positive or negative, so the signals sometimes are going to be opposite, and just backflow to the other device rather than going through the speaker to ground.