What type of plug connector is on the ext. mic, a 4 pin plug or a 3 pin plug?
If it is a 3 ring plug then it won’t work properly as the combo unit like the socket in a mobile phone, it needs the 4 ring plug.
If it is a 3 ring plug then it needs to be changed to a 4 ring plug and the mic wires need to be connected as shown in the image below
[image|2170187]
(click on image to enlarge for better viewing)
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=== Update (07/31/2020) ===
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Hi @Shubham Rawat
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As you say it is weird. I'm wondering if the external microphones are wired differently to the headphones/mics.
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By this I mean that one is wired to the OMTP standard and the other is to the CTIA (AHJ) standard. This means that the mic circuit is reversed.
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Here’s an image of what I mean showing the two wiring standards. Note that the microphone lead is reversed with the ground lead
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[image|2170817]
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(click on image to enlarge for better viewing).
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A way to test this quickly without to much hassle is to get an [https://www.cablechick.com.au/cables/35mm-4-pole-trrs-standards-bi-directional-adapter-ctia-to-omtp.html|adapter] so it should work correctly in either situation.
Hi,
What type of connector is on the ext. mic, a 4 pin plug or a 3 pin plug?
If it is a 3 ring plug then it won’t work properly as the combo unit like the socket in a mobile phone, it needs the 4 ring plug.
If it is a 3 ring plug then it needs to be changed to a 4 ring plug and the mic wires need to be connected as shown in the image below
[image|2170187]
(click on image to enlarge for better viewing)