Capsule amplifier in electret microphone

New to this forum but here seems to be quite a few with great understanding of electronics.

I would like to modify the capsule amplifier of my Nakamichi/Primo microphones. Here a few schematics.

http://www.file-upload.net/download-357819/capsuleamps1.pdf.html

http://www.file-upload.net/download-357828/capsuleamps9.pdf.html


What about the output impedancies of C, D and E? A and B, have very low output due to the output transformer. Would like to raise it.

Can this circuitry be modified to run on a 9V battery? I would not like to use phantom power.

http://www.scotthelmke.com/alice-schematic.jpg

Welcome.

Check the permissions on those images; they all give a "Forbidden"-error when I try to access them.

By the way, JPEG (.jpg) is not a good way to store schematics or other line art, as the compression algorithm tends to make it all blotchy (unless you set the compression ratio very low, but that leaves you with rather large output files). PNG or even GIF is better.

JDB.

I hope the schematics below are clearer.

http://www.file-upload.net/member/download-3265/zsohy9.pdf.html

http://www.file-upload.net/member/download-3265/ce3c3f.pdf.html

I have tried to adapt Scott Helmke's Alice circuitry to a 9V battery supply. Can someone help me?