Sean-
I have just finished building the calibration board you sent me.  It
seems to be working OK (I haven't went through the output with a
'fine-tooth comb' yet).  I have answered my previous question: the input
is a contact closure and the U12 circuit appears to be a single-shot to
reset/start counting.

I do have several questions on the function of some of the
potentiometers.  I am using the part# from your drawing.  I am assuming
that the 100K (R13) potentiometer adjusts the magitude of the "D/A"
counting pair?  I also assume that the 5K (R23) potentiometer is used to
balance the bridge when the seismo coil is inserted.  Finally, what is
the function of the 100K (R14) potentiometer?

Thanks in advance

Rex Klopfenstein, Jr.
Bowling Green, OH




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