How come IEMs and earbuds do not have two signal carrying cables for each channel if an audio signal is AC?

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#62
Larpy wrote, “don’t think like a troll.”

Don’t think twice, it’s alright. As Bob Dylan said at the end of all his records, “Good luck to everyone.“

Larpy wrote, “AC operates like a phase splitter“

Whoa! What!! If that’s what you got out of my posts I will consider drawing more pictures the next time. 🔛 🔙 🔜

Let the name calling proceed. 😲
 
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#64
broadtalk said:
...how come one cable is able to carry an AC signal?
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It can but not without some penalty. Since the one cable has some resistance, there will be some voltage drop across it. Since the voltage drop will be from the combined current of the two earbuds, the design will produce some crosstalk between the channels. However, the crosstalk is not likely to be objectionable with common earbuds. OTOH, with low impedance planar headphones driven by a very high fidelity system, the difference between cable resistance produced crosstalk versus essentially no crosstalk may be audible.
 
#66
It doesn't. There is a voltage drop across each earbud motor. Then there is the voltage at the amplifier output. There are voltage drops across each of the wires due to their resistance and the current flowing in them. That's all. Its enough to make crosstalk when there is a shared ground wire.
 
#67
But the earbud “motor“ includes a magnet, no? Just as a speaker does. The so-called “ground” wire is simply the “other wire” and current travels on both wires, just like a speaker.as I opined before, both wires have the same function, if you reverse the wires the earbuds will be in reverse polarity, no? Just like for speakers. This why all types of speakers, headphones, earbuds, operate AC. You can’t run AC on one wire.
 
#68
The current flows in a loop, as others have already said. There are two loops, one for each earbud motor. The two loops share one common wire, the so-called ground. Two loops sharing a common branch (the ground wire) is perfectly permissible, and commonly seen in many types of circuits.
 
#69
It’s a semantics argument, you say loop, I say parallel wires, as you would see for speaker cables. It’s actually easier to grasp how this all works to produce sound if you think of the wires as “push pull“ - one wire pushes the diaphragm out the other pulls it back in. The push-pull occurs at the rate of the audio frequency at that instant. The diaphragm moves because the moving e field produces a magnetic field that interacts with the magnet on the motor.
 
#76
Markw4 said:
It can
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No, it can not.
A single wire can NOT carry any kind of signal.
It can not carry voltage because voltage is always referred to some other conductor.
It can't carry current because current must return to you're through other conductor.
It can't carry power because it needs to simultaneously carry voltage and current, which it can not.
What-are-you-talking-about?
Markw4 said:
but not without some penalty. Since the one cable has some resistance, there will be some voltage drop across it. Since the voltage drop will be from the combined current of the two earbuds,
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WHICH current?
Markw4 said:
the design will produce some crosstalk between the channels. However, the crosstalk is not likely to be objectionable with common earbuds.
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Who's talking crosstalk?
Please stick to thread subject instead of kicking the ball outside the field.
Markw4 said:
OTOH, with low impedance planar headphones driven by a very high fidelity system, the difference between cable resistance produced crosstalk versus essentially no crosstalk may be audible.
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Nonsense and in any case completely unrelated.

Markw4 said:
It doesn't. There is a voltage drop across each earbud motor. Then there is the voltage at the amplifier output. There are voltage drops across each of the wires due to their resistance and the current flowing in them. That's all. Its enough to make crosstalk when there is a shared ground wire.
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10 seconds ago you were talking a single cable, now TWO?
Where did you pull the second one from?
At least be minimally consistent with what you argue.
chrisb said:
Mark, I guess if sarcasm needs to be noted, it missed the target🙄.
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Sarcasm needs at least a certain IQ level at the receiving end, or it's simply not noticed, just taking it literally.

FWIW I was also offered the microwave oven schematic
Which in this case was useful, not because it was related to thread subject but because I actually need to repair mine, for which I am grateful.

Maybe you will also have to repair one someday? 😎
 
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