Title: Tachometer circuit

Abstract: A D.C. tachometer circuit comprising a non-linear D.C. tachometer which produces an output voltage having an A.C. ripple, a first current path from the D.C. tachometer including means for removing the D.C. component of the output voltage of the tachometer, means for inverting and isolating the A.C. voltage ripple, and means for eliminating drift and the D.C. level of the inverted and isolated A.C. voltage-ripple, means for mixing the original output voltage of the D.C. tachometer including the A.C. ripple and the inverted and isolated A.C. voltage ripple to establish a non-linear ripple-free output voltage, and means for linearizing the non-linear ripple-free output voltage.

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Inventors: Schoonover, Stanley C. (Waynesboro, PA, US)
McIntosh, Michael D. (South Mountain, PA, US)

Application Number: 545993
Filing Date: 1975-01-31
Publication_date: 1976-01-20
Assignee: Landis Tool Company (Waynesboro, PA)
Primary Class(es): 324/163 324/132, 324/164, 327/307, 327/362
Other Classes:
US Patent Ref:

3178641	Apr, 1965	Varterasian	324/164.
3371224	Feb, 1968	Polo	307/230.
3371269	Feb, 1968	Wattson	307/230.
3644836	Feb, 1972	Johnson	328/143.

Other Refs:
Primary Examiner: Rolinec, R. V.
Assistant Examiner: Sunderdick, Vincent J.
Attorney: Smith; Spencer T.