Almost OT: Is this a reasonable buffer for audio range?

Might seem like a dumb question, but ... I haven't done
anything analog in a long time. Application is recording,
driving a 20 or 50kohm line/mic input ( I'll explain that
if needed, but think the 1/4" unbalanced inputs on a Mackie
type mixer, that sort of thing... )

http://www.freeinfosociety.com/electronics/schemview.php?id=323

Also, is it possible to sub in a 10M resistor for the 1M
resistor to increase the input impedance? Would it be too
noisy? Source will be mainly electric guitars, maybe a peizo.

Might seem like a dumb question, but ... I haven't done anything analog
in a long time. Application is recording, driving a 20 or 50kohm
line/mic input ( I'll explain that if needed, but think the 1/4"
unbalanced inputs on a Mackie type mixer, that sort of thing... )

On Mon, 12 Dec 2011 13:07:02 -0600, Les Cargill wrote:

Might seem like a dumb question, but ... I haven't done anything analog
in a long time. Application is recording, driving a 20 or 50kohm
line/mic input ( I'll explain that if needed, but think the 1/4"
unbalanced inputs on a Mackie type mixer, that sort of thing... )

I would also recommend this booster:
http://www.muzique.com/schem/mosfet.htm
I built one adding the relevant circuitry to supply it with phantom 48V
power, plus some minor moifications, using it with dynamic mics, electric
guitar and bass with really good results.