There's a lot of confusion about the PC microphone connector wiring because the first sound cards that used 3.5mm microphone input usually used tip for the audio and the ring for the bias voltage giving you a choice of whether you wanted the bias or not.
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These days, most devices seem to just use the tip for both bias and microphone - since most microphones elements prefer that approach.
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Unfortunately there's no agreement about whether the tip and ring need to be connected together in case you plug the microphone into an old style sound card.
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You'll need to measure with an ohmmeter between tip and ring to find out, and I suggest always checking this out yourself to be sure.
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Hope this helps.
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M
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