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<DIV><FONT face=Arial size=2>The Earthworm triangle channel will work with any
function generator that can produce a reasonably linear triangle wave signal
that is close to +/- 2.0 volts (4vp-p) and 2.0 hz. Attached is a PDF
of a simple circuit circuit that will do the trick. I can
provide Gerber files, etc. for a PCB for this circuit if you email me
at the address below.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Gray Jensen</FONT></DIV>
<DIV><FONT face=Arial size=2>USGS (retired)</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="mailto:gjensen@usgs.gov">gjensen@usgs.gov</A></FONT></DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=dwilson@usgs.gov href="mailto:dwilson@usgs.gov">David C Wilson</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=anss-netops@geohazards.usgs.gov
href="mailto:anss-netops@geohazards.usgs.gov">anss-netops@geohazards.usgs.gov</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, October 15, 2010 12:47
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [ANSS-netops] Earthworm Guide
Channel Triangle Wave Generator</DIV>
<DIV><BR></DIV><BR><FONT face=sans-serif size=2>Hello,</FONT> <BR><BR><FONT
face=sans-serif size=2>I am sending a note here on behalf of HVO, they are
experiencing problems</FONT> <BR><FONT face=sans-serif size=2>with their
Earthworm Guide Channel Triangle Wave Generator. It seems to</FONT>
<BR><FONT face=sans-serif size=2>be producing spikes that are causing DAQ
restarts and subsequent data gaps.</FONT> <BR><BR><FONT face=sans-serif
size=2>Does anyone have a spare Triangle Wave Generator or at least the
schematics</FONT> <BR><FONT face=sans-serif size=2>so that they can build a
new one?</FONT> <BR><BR><FONT face=sans-serif size=2>Thanks,</FONT> <BR><FONT
face=sans-serif size=2>Dave</FONT> <BR><BR><FONT face=sans-serif size=2>David
Wilson<BR>US Geological Survey
<BR>Albuquerque Seismological Laboratory <BR>P.O. Box 82010
<BR>Albuquerque NM 87198-2010<BR><BR></FONT>
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