Wireless Headphone External Mic

N

NBD925

Member
Hello I have a set of Konnect Adventure Bluetooth Headphones.

Link Below:

https://a.co/d/ccptfDW

The Microphone on these sits in the left earpiece and is muffled when you speak into it. I imagaine because your ears are covering it. I would like to wire in something like a Boom mic or remote microphone that I can stick in my helmet closer to my mouth.

Example: solder in the extension mic leads with the existing connection or replace the the old mic with the new extension. The wires would push through the existing mic hole and extend out to the front chin area of my helmet where the Mic would be secured with small velcro.

Here are some pictures of the connections inside the headphone. I see 4 wires soldered on but it looks like only 3 are actually connected. Why 3 wires? Power, Ground, Signal???

 
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Are both the outer ones grounds? A picture of the back of the PCB would be helpful?

If you touch something metallic to each contact in turn while listening to the audio, you should hear a click or buzz when you touch an analog audio connection?

It looks like a MEMS mic; they can have either analog or digital output.
 
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I will work on getting a picture of the back side of this board.

It looks like this is an Analog MEMS Mic. I found a picture of an analog Mems Mic wiring diagram and it looks about right.
 
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NBD925 said:
Would I be able to just solder in a Regular microphone into the connections.
Click to expand...
Not quite directly, as an electret mic capsule needs a bias feed and the output on the same terminal.

However until the connections are identified, it's guesswork as to where to connect it..

 
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With a 5V supply and a 10k biasing resistor, many electret mics will not work properly.
Most electret mics use a 2V minimum supply and draw 0.5mA max. Then the electret mic gets 5V - (10k x 0.5mA)= 0V.
Using a 4.7k resistor with the 5V supply, the mic gets 2.65V and works fine.

I use a 10k resistor with a 9V supply.
 
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Its kind of a moot point considering that we don't know the voltage. 2.5K to 5K is the normal range for electret mics. The computer mic input circuit uses the 2.5K with 5V internally, So there is a lot of people don't know the support circuit is already installed. The only thing with some sound cards, you have to turn on the 5V in the microphone's control panel in the computer's sound card settings .

To the TS, yes you could use a different mic, its just that you may have to add a support circuit to it.
 
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I just got around to pulling this project out again. Can anyone help me get a remote microphone to work with this?

Problem: the existing microphone is in the speaker enclosure pressed against your ear while wearing the helmet. I would like to wire in a remote microphone that would be closer to my mouth so people can hear my transmissions better. My transmissions are very muffled and low volume now.
 
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Can I just extend this Mic with a short ribbon cable or small 4 wire cable. I was thinking about de-soldering the 4 Mic connections and adding a 6 inch section of wire to extend the Mic from the Ear Piece more toward my mouth.

I would protect the Mic and wire connections in a small housing.

Thoughts on that?
 
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NBD925 said:
Here are a couple pictures. Hope its clear enough.

I was hoping to find the whole PCB strip and mic setup as a unit.
Click to expand...

You would need to source it from the headphone manufacturer as a spare part, something which is likely impossible. It's not a standard 'component', it's either made by the headphone manufacturer, or made by a third party specially for them.

The microphone insert itself should be standard, as are the resistors and capacitors, so you could always design your copy of it, and have the PCB and flexible PCB made for you - but probably not easy, although fairly cheap?.

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What would be the best solution to recreate this circuit? Looks to be 4 wires 4 components. I would like it to be as small as possible. Any way to solder these components onto a sourced flat board to make all the connections?

I guess what I asking, is there any way to replicate or get close to this form factor?
 
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You can build it on anything you like, it's just a question of making it fit - are you trying to fit it somewhere else than the original location?.

Edit:

Just had a quick look round, this looks pretty small, and you could easily run wires from it.

 
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Yes, Its a pair of in helmet headphones. The Mic is in the right side earpiece giving low and soft transmissions. I would like to move it with a 4 wire extension about 6-8 inches like a remote Mic closer to my mouth.

I could desolder the original and solder on the 4 wire extension but would love to build a new one as a small project as long as I could keep the form factor small for the remote mic.
 
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You need to bear in mind, these microphones can be analogue or digital - you need to get the same type, or it won't work at all. The four wires suggests it's a digital one? (analogue only needs three wires).
 
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