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I have a stereo microphone - Sony ECM-MS907 - that I would like to connect to my computer (which is mono).

I read that the computer connector provides power to my microphone, but I don't need it since it already has a battery.

Can I still connect it without breaking? Which kind of adapter would I need?

  • What do you mean "your computer is mono"? Most sound cards analog i/o is done through stereo jacks. So you could just connect your stereo microphone to stereo jack, labelled "mic in" (often pink jack on the rear of PC) – xakepp35 Mar 19 '16 at 1:14
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To answer your question directly yes you can connect a stereo mic directly up to a mono input without causing damage. Worse case scenario is it won't work. Next worse case scenario is it will work but you will only get one channel. Most likely scenario is the soundcard's mono connector is designed to touch the ring and the tip and short them together creating one channel that is the addition of the two channels from your microphone You see The tip and ring on a stereo headphone jack are the two channels and the sleeve(the part closest to the wire) is a common ground.

In theory the two microphones may fight each other causing distortion, but looking at your microphone's schematic I can tell you you have a well designed preamp built in to the microphone that will prevent this. If you want a studio quality solution what you do is you make or buy a mixer. This can be made with a chip or two(I suggest an OP amp designed for low noise, low distortion, small signal audio applications) and a few resistors or a couple potentiometers if you want variable amplification/mixing.

I found a schematic for your microphone.

http://www.coutant.org/sonyscan/ecm-ms907_v1.2.pdf

Your microphone is self powered. You can see each microphone element is powered directly on one side. The other side is connected to a JFET(Junction Field Effect Transistor) . This transistor is operating as a buffer and voltage gain section. It has a very high impedance(>100k ohms) and a high voltage gain. It however has a high output impedance(guessing around 10k ohms I haven't done any circuit analysis). This is undesirable. So the JFET voltage gain/buffer section is followed with a BJT(Bipolar Junction Transistor) in an emitter follower configuration. This type of amplifier has a voltage gain that is near 1(98% or so is normal) but it makes a good output buffer due to low output impedance.

source: electrical engineering classes at an ABET accredited school

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how can a single sound source be stereo, do you see 2 heads? stereo microphones are a bit rare, and most people having them know how to handle them , so you don't have a stereo microphone.

What you have is probably a microphone with a balanced jack which has nothing to do with stereo.

If you are sure the microphone is powered(?) go ahead and put it in , no problem!

And if u hear no sound don't be afraid, there's a chance a pre-amp will be needed.

  • I have a Sony ECM-MS907 – nsn Jan 15 '16 at 12:55
  • ok ,it does seem that the sony is a stereo microphone using MS technique (don't care about it, or read about it). First of all you will not have any problems connecting it to your computers plug, secondly i don't know where sony does the decoding of the MS (cause it's an encoded signal) , did any software come with the mic? I don't know if you are going to be able to use it to it's full extend but surely no problems about connecting it! – frcake Jan 16 '16 at 21:07
  • This was sold with a mini disk. Meanwhile it broke, but I would like to be ablet to use the microphone. Unfotunatly I plugged it in the computer and an MP3 recorder and got no output. – nsn Jan 17 '16 at 18:58
  • should be the absence of pre-amp , the mic itself might have a battery but it's for another job, it's because it's an electret microphone. So bottom line is that you most probably need a preamp and a way to decode the MS signal coming. I really don't think i can get very technical :S – frcake Jan 18 '16 at 8:54

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