One More Overcomplicated Mic Preamp

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Attach is a design for a microphone preamplifier. It is transformer in and out. The input is a 2/1 step up the output can be also but will most likely stay as a 1/1.

The gain is adjustable from 10 db to 60 db.

Relays are used for gain switching to reduce stray capacitance.

It is a two stage design with each stage having the same gain so that the second inverting stage will help to cancel the first stage distortion.

It is also a balanced design. That allows greater headroom and more distortion cancellation.

The use of two stage also allows greater PSSR.

The power supply is not shown.

Open for questions or comments.
 

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  • 4 AD797 LME49600 J.JPG
    4 AD797 LME49600 J.JPG
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