Mixed-mode feedback gain formula - diyAudio
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Old 25th June 2011, 08:55 PM   #1
antomas is offline antomas  Europe
diyAudio Member
Join Date: Feb 2003
Location: Torino, Italy
Default Mixed-mode feedback gain formula

Please, does anybody know how to compute the voltage gain of this circuit?
The page describing it can be found here:
Variable Amplifier Impedance
Thanks to anybody willing to answer.
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Old 25th June 2011, 09:52 PM   #2
djoffe is offline djoffe  United States
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Join Date: Oct 2008
Default Here you go!

see enclosed pdf
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File Type: pdf mixed mode gain.pdf (55.7 KB, 101 views)
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Old 25th June 2011, 10:54 PM   #3
antomas is offline antomas  Europe
diyAudio Member
Join Date: Feb 2003
Location: Torino, Italy
Originally Posted by djoffe View Post
see enclosed pdf
Great stuff! Thousand times thanks!!!

The reason for asking about the formula is that I'd like to try this circuit (with a higher Zout) to implement the concept described by Nelson Pass in this document to drive a Fostex FE206 in sealed box.
As a chipamp I'd like to use the popular LM3875, keeping into account the minimum voltage gain needed to prevent instability. Hope the mixed mode feedback shall not make things harder.

Eventually this system could provide decent sound with little build effort.
Time will tell.

Again, heartfelt thanks.
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