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Microphone long distance balanced connection

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Hello dear engineers.

I'm looking for solution to connect an electret microphone via the long cable about 20 - 30 metres by using balanced audio.

The first question is if it's possible to use CAT6 or batter ethernet cable for this application?

The second question is if some one could suggest me about pare of ICs on both ends of the line to take sound from microphone convert it to balanced audio on one end of the cable and then on the other end of the cable back from balanced audio to regular mono line/headphones (or something similar) output. Also it should be available to power them only with V+ and GND without V-.

Best regards,

Roman Shteringarts. 



Added power requirements.
[edited by: 6resh6 at 12:29 PM (GMT -4) on 14 Aug 2022]
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  • Hello Roman,

    You will have to get a preamp for the microphone at the microphone and then run balanced once it is amplified up to line level. You will not be able to run an electret mic that far without any kind of preamp. 

    Once the signal is up at line level and balanced, then you can run it on CAT6 cable if you like but not until you amplify it and balance it. 

    Twisted pair microphone cable would be best if you have a choice. 

    Dave T

  • Hello Dave, thank you for your reply.

    That's what exactly was about to do first of all amplify the microphone signal, than make it balanced than in the other end of cable make it from balanced to headphones/speaker output.

    The question is, if you can suggest me any of your products for this application, something most common and not expensive, or at least give me advise which parameters should I look for to find something compatible for my project?

    Best regards

    Roman Shteringarts

  • Hello Roman,

    I am not sure if this is something you want to design and build or purchase already build devices? 

    If you search on the internet for Electret Mic Preamps you will find several kits and designs out there. There are many choices. 

    Then to create a differential output going to a differential receiver you can use the SSM2142 to balance the output then go to either a SSM2141 or SSM2143 depending if you want -6dB or unity.

    The problem with using these or any other differential drivers/receivers is that they need a + and -  power supply. To adapt the design for single ended power you have to develop a pseudo ground and cap couple the inputs and outputs. 

    Also, you might want to look through this web site. They have a lot of different small pieces of equipment that might do what you need. 

    Court Reporting mics, USB mics, Binaural mics, Zoom recording systems, Audio Technica products - The Sound Professionals, Inc.

    Dave T

Reply
  • Hello Roman,

    I am not sure if this is something you want to design and build or purchase already build devices? 

    If you search on the internet for Electret Mic Preamps you will find several kits and designs out there. There are many choices. 

    Then to create a differential output going to a differential receiver you can use the SSM2142 to balance the output then go to either a SSM2141 or SSM2143 depending if you want -6dB or unity.

    The problem with using these or any other differential drivers/receivers is that they need a + and -  power supply. To adapt the design for single ended power you have to develop a pseudo ground and cap couple the inputs and outputs. 

    Also, you might want to look through this web site. They have a lot of different small pieces of equipment that might do what you need. 

    Court Reporting mics, USB mics, Binaural mics, Zoom recording systems, Audio Technica products - The Sound Professionals, Inc.

    Dave T

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