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Old 02-01-2011, 05:36 PM   #1
flynhawaiian
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OEM BMW Microphone to Dice Unit

Is it possible to utilize the factory microphone with the dice bluetooth unit? If so what pins need to be connected to make a cable? I have looked in previous threads and have found nothing.
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Old 02-01-2011, 07:17 PM   #2
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I dont think you can just plug the factory mic into the parrot or dice units. The factory mic is powered, here is a thread where someone used the factory mic with a pc.
It's a starting point I guess...
http://www.mp3car.com/vbulletin/show...1-compact.html


If you come up with a solution you should post it up
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Old 02-01-2011, 08:26 PM   #3
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Well it looks like a simple board is needed...

http://web.comhem.se/bengt-olof.swing/mic.htm
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Old 02-02-2011, 10:15 AM   #4
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curious as well. The WDS is a little vauge on the wiring, but clearly there is a mic pos mic neg and xx? If it was truely powered it would need another ground or perhaps the third wire is a ground? I suppose you would wire up a harness to the OEM mic, then simply splice in the =/- into the mic cable of the device your using. Getting the harness is not the problem....
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Old 02-02-2011, 02:37 PM   #5
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I'm trying to build his circuit. Once I do it, I'll have a printed board made. Is there any interest in the printed board, I believe the company I get it through will sell them for cheap or something. Thinking about having them made from china.
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Old 02-02-2011, 02:41 PM   #6
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Also I found that a servo plug from a remote control car plugs right into the microphone, so that side is easy. And I was looking at the cables to go velocity wire and cut off one of the plugs.
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Old 02-07-2011, 01:00 AM   #7
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I just picked up the Dice unit and am in the process of changing over from OEM Bluetooth module because I wanted A2DP. Would love to be able to reuse the OEM mic. Please let me know if this comes of fruition and I will pay for an adapter should you choose to make them.
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Old 02-07-2011, 01:09 AM   #8
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Still working on it. I have the basic schematic done, but need to test the circuit first. I need to order the parts and wait for them to come in from china. It will take a little bit... The basic premise is that you inject 5v into the microphone. Basically you use a voltage regulator from 12v that outputs 5v. So the 5v + a 47uF capacitor goes into the mic. This is based off of the url from above. Once I get the parts, I'll make up the circuit. I'll have extra parts left over and will just send you a circuit. Hoping it works...

The car is in the shop at the moment as well.
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Old 03-05-2011, 04:54 PM   #9
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Still waiting for the resistors to come in.
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Old 03-05-2011, 06:13 PM   #10
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I am interested to see how this works out when you finish. I may pick up an oem mic for my parrot kit.
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Old 03-05-2011, 06:18 PM   #11
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I'll let you know as soon as I get it done.
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Old 05-12-2011, 07:34 PM   #12
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OK, so I went ahead and gave this a shot, and I am having an issue.
I gathered some parts, circuit board, cap, resister, diode, and a voltage regulator and assembled it to the best of my ability. Hopefully someone with a better understanding in electronics can give a hand.
From what I gather from the guy that got this working and has a diagram (http://web.comhem.se/bengt-olof.swing/mic.htm) there should be 3.2v at the mic input +. Well I am getting 4.98v at my mic input + wire and haven't hooked the mic up in fear of toasting the factory mic. I was wondering if perhaps I need a smaller voltage regulator or a larger resistor to get the voltage down closer to 3.2v. Anyone spot my mistake? I attached a pic of my finished circuit, the schematic Im working from, and a drawing of what I did.

Thanks in advance!
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Old 05-12-2011, 07:58 PM   #13
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It seems like your only using 1 resistor and 1 cap. I haven't had the time to work on finishing the circuit, but you need a 0.33uF cap, per the recommendation of the datasheet from the LM7805, on the ground output. If it's 3.2v you need more of a voltage drop with a bigger resistor or use the LM7833 at the output of the 5v to step it back down to 3.2v. I believe that 5V is what you want going into it, but I just cannot remember or be 100% sure. I would say to try the 5v, but if you fry it don't hold me to it :/.

If I have some time this weekend I'll finish it up. I've just been so busy the last few months, and I have a migraine right now so I'm not much into it.
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Old 05-12-2011, 10:27 PM   #14
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Well I went ahead and tried it out, and it just makes a wine noise and you cannot hear my voice. I'm sure it is a flaw in what I built.
I will go ahead and wait to see how you do and your results Ill keep an eye here for updates!
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Old 05-13-2011, 05:06 AM   #15
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All mics need a bias, so your DICE/parrot may already provide one, making this circuit unessesary. It might be worth checking the bias voltage on the unit you are trying to mate with the BMW before building a circuit. This may be the 5V you are measuring on both sides of the 47uF in the MSPaint diagram.

If you are measuring 5V on both sides of the 47uF without the DICE/Parrot connected, you may have made a mistake in your wiring and should check it carefully.

Last edited by Arty; 05-13-2011 at 05:07 AM.
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Old 01-10-2012, 03:09 AM   #16
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I am attempting to re-use the OEM microphone with a DICE unit and have found this thread while seeking information. By chance, did someone complete this and can help me out as well? Thanks.
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Old 01-11-2012, 11:03 AM   #17
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I made one variation and wasn't completely successful, but I know where to change things. I just haven't had the time to order up a new PCB. I need to dork it up a bit...
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Old 01-11-2012, 11:33 PM   #18
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I've got a parrot bluetooth and I'd like to use the OEM mic in the steering wheel too, so if your setup can fix this, I'd like one.
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Old 03-14-2012, 01:39 PM   #19
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Any progress on this?
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Old 03-28-2012, 08:57 PM   #20
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I dont understand why you just can't hook this into the media bridge directly. Does anyone know what the 3rd wire is for?
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