Hello Everyone,


Recently I finished construction on my first seismometer.  I used
schematics off of Larry Cochrane's web site to wire wrap the amplifier:
http://psn.quake.net/sgsumamp.gif and http://psn.quake.net/sgproc.gif

I housed the amplifier in a steel box, grounded to analog ground on the
amplifier board.

I have the output of the amplifier connected to Larry's 16 bit A to D board
with about 16 feet of shielded wire.  The shield, around the wire, is
grounded to the case of my computer.  When viewing the output with SDR I am
getting about 80 to 100 counts of continuous noise.  I don't know what the
frequency of the noise is but the period is too short to see on SDR.

Is this noise level abnormally high and does anyone have any suggestions on
how to reduce the noise.

Thanks for your time!

Mark



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