Amplifier White Noise

[Scott Gravenhorst]

I just put together a 2 transistor preamp and I noticed
that there is some white noise, even with a shorted input.  The input
transistor is an MPF-102 biased with a 1 meg resistor to ground.  Is
the noise a result of the FET's reverse biased gate?  When I put a signal
thru it, there is enough gain that the noise becomes unnoticable, I'm
just curious as to where it comes from and what I might do to reduce
it.

The circuit is at http://www.flash.net/~chordman/ContactMicPreamp.html

-- Scott Gravenhorst
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