🚀 go-pugleaf

I can't answer your question about building a mic preamp but I do have a
few pieces of info that might be helpful.  The input level for consumer
audio electronics is generally -10dB, not -17dB.  There are two main types
of microphones: condenser and dynamic.  Dynamic mics require no power. 
Condenser mics do need power.  This power (DC always) is provided by a
battery or what is called phantom power.  Phantom power is a +48V DC
current that is run over the same conductors as the audio is.  Be aware in
your mic amp project that all but the most cheapo mics have an
electrically balanced output and have a low internal impedance.  Optimum
performance will not be achieved unless the preamp has a balanced input of
appropriate impedance.  It'll work anyway, though, so unless you're
mastering a CD it's probably nothing to worry about.

Ben Denckla
Electronic Music Studio
Harvard University