However, I figured out that the basic gain block circuit, which does something like 23dB of fixed gain, is a pretty nice alternative to the Cloud Lifter type devices for dynamic mics with the standard mic pre nowadays. So I'm building a box with a four of those and a couple different varieties of transformers that I had laying around.
I'm having circuit boards made, and I'll have extras. Anyone interested? The actual board and components will be pretty cheap, just a few bucks. A really good modern switching supply is under $15, and then you just need mic transformers (the expensive part). Unbalanced output probably equivalent to a decent condensor mic when a dynamic is plugged in. No provision for phantom power but that would be pretty easy to add with another (+48vdc) switching supply.
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