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Old 23rd April 2013, 06:04 PM   #1
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Join Date: Nov 2008
Location: Oakmont PA
Default One More Overcomplicated Mic Preamp

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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File Type: jpg 4 AD797 LME49600 J.JPG (343.9 KB, 94 views)
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Old 23rd April 2013, 06:17 PM   #2
DF96 is offline DF96  England
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Join Date: May 2007
'Same gain' does not mean same distortion; you need same signal level too i.e. no gain in the first stage. That is the snag in many claimed 'distortion cancellation' systems.
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