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Impedance Increaser

Discussion in 'General Electronics Discussion' started by veenife, Jan 20, 2014.

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  1. veenife

    veenife

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    Jan 20, 2014
    Hey, im a total noob... and i dont really understand much of electronics... ive just got a basic idea of the things.....

    im doing a project at school which i want to build an input impedance increaser for a microphone....

    can any one help me with that??
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
  3. veenife

    veenife

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    Jan 20, 2014
    ... i want to increase the impedance of an already made mic preamp...
    ... a device which i can plug in between mic and preamp that will increase the microphone input impedance...
     
  4. BobK

    BobK

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    Jan 5, 2010
    That would be called a preamp. A FET preamp should do the trick.

    Bob
     
  5. veenife

    veenife

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    Jan 20, 2014
    yeah damn... tha makes alot of sense... hhuahua... can i find anywhere online how to build a simple preamp with very high input impedance.... i mean super high input impedance!!!
     
  6. BobK

    BobK

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    Jan 5, 2010
    Look up FET preamp.

    What are you expecting to happen when you have "super high impedance?" It should not be needed for a microphone.

    Bob
     
  7. veenife

    veenife

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    Jan 20, 2014
    its just about a ribbon microphone with high output impedance... if i would use it in a normal preamp the frequency response of this mic wont work as it should, but making the input impedance higher i can get it to work properly...
     
  8. BobK

    BobK

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    Jan 5, 2010
    Okay. You could also use an opamp voltage follower to get input impedance of 10s of Megohms.

    Bob
     
  9. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
    Are you sure it's a ribbon microphone? Ribbon microphones normally have a fairly low output impedance (a few hundred ohms) and a low signal level. Often, a transformer is used to increase the signal level; this also increases the impedance, so it has to be used with a preamp with medium or high input impedance.

    Low-impedance microphones can also be connected directly to preamps with relatively low input impedance, such as common-base circuits.

    What's the brand and model number of the microphone?
     
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