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Old 7th February 2009, 04:58 PM   #1
pixpop is offline pixpop  United States
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Default Linkwitz Mic Preamp variant

Hi,

been experimenting with some sound recording, and the measurement microphones described by Linkwitz:
Linkwitz Measurement Microphone

Linkwitz modifies the mic capsules to configure the FET as a source follower. I happened to have an INA141 instrumentation amp that I was wanting to use, so I built a preamp using it. Instead of configuring the FET as a source follower, I divided the resistor in two, and made it a phase splitter. I AC coupled the two signals to the inputs of the INA141.

This works fine, it's very quiet and sounds OK. I haven't been able to perform any detailed measurements yet. It would probably be better with a different IN-Amp, such as INA217, but this is what I had on hand.

My question is: is there anything inherently wrong with this approach? Specifically, is it going to be less linear than the source follower configuration? Is it going to generate more noise? Is it going to clip more easily than the source follower?
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Old 7th February 2009, 07:59 PM   #2
lineup is offline lineup  Sweden
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I think it is a nice idea.
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Old 7th February 2009, 11:36 PM   #3
lms is offline lms  Micronesia
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6 DB less headroom but 6 db more gain
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