Tachometer circuit
First Claim
1. A D.C. tachometer circuit comprisinga non-linear D.C. tachometer which produces an output voltage having an A.C. ripple,a first current path from said D.C. tachometer includingmeans for removing the D.C. component of the output voltage of the D.C. tachometer,means for inverting and isolating the A.C. voltage ripple,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, andmeans for linearizing said non-linear ripple-free output voltage.
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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.
13 Citations
9 Claims
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1. 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 said D.C. tachometer including means for removing the D.C. component of the output voltage of the D.C. tachometer, means for inverting and isolating the A.C. voltage ripple, 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 said non-linear ripple-free output voltage.
Specification