On 08/04/17 00:06, Rodolfo Medina wrote:
David Christensen <dpchr...@holgerdanske.com> writes:
One more question that might explain the ring -- do the
microphones have switches?


They don't.  The two ones that come with headsets have volume control
wheel, but I don't know if it is for the headsets only.

My first guess would be that the volume control is a stereo logarithmic potentiometer wired between the earpieces plug and the earpieces. Electronic test equipment might provide more clues.


On 08/04/17 00:06, Rodolfo Medina wrote:
David Christensen <dpchr...@holgerdanske.com> writes:
What is the make and model of your netbook?

It's an Acer Aspire One, and the model should be ZG8.

When I go to the Acer support page:

https://www.acer.com/ac/en/US/content/drivers


"ZG8" is not a valid model number -- it should be something like "AO521".


If your netbook has a stereo microphone/ line-in connector, then you might be able to make stereo recordings by patching the left microphone to the tip (+) and sleeve (-) and the right microphone to the ring (+) and sleeve (-). (e.g. the negatives are commoned).


Do the headsets have one or two phone plugs?  What color or
colors? What size or sizes -- original 1/4 inch, miniature 3.5 mm,
or sub-miniature 2.5 mm?

They all have one green 3.5mm stereo plug.

So, one green stereo 3.5 mm miniature phone plug for the earpieces and one black stereo 3.5 mm miniature phone plug for the microphone?


As you know the make and model, perhaps you can find the specifications
and/or contact technical support to ask them what signals are connected to the tip, ring, and sleeve.


I have a Logitech headset that came with a Logitech webcam.  Neither
have an obvious model or part number on them.   The headset has:

- One black stereo 3.5 mm miniature phone plug with a headphone symbol

- One pink stereo 3.5 mm miniature phone plug with a microphone symbol.


Checking the DC resistances between the tip, ring, and sleeve of the microphone plug using my Fluke 77 DMM:

tip-ring        0.3 Ohm
tip-sleeve      1080 Ohm
ring-sleeve     1079 Ohm

I expect that the headset microphone is monophonic, the signal common
is wired to the plug sleeve, and the signal hot is wired to the plug tip
and ring in parallel.


Checking the DC resistances of the earpieces plug:

tip-ring        46.1 Ohm
tip-sleeve      23.8 Ohm
ring-sleeve     24.3 Ohm

using some jumper cables, and playing some music on my computer, I expect that the two earpieces are monophonic, the earpiece negative terminals are wired to the plug sleeve, the left earpiece positive terminal is wired to the plug tip, and the right earpiece positive terminal is wired to the plug ring.


What size are the phone plugs on the non-headset microphones?

Same: 3.5mm, stereo.  All of them.

Color?


David

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