Comparison circuit for alignment apparatus
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United States of America Patent
Stats
-
Dec 15, 1981
Grant Date -
N/A
app pub date -
May 8, 1979
filing date -
May 8, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A comparison circuit for use in an apparatus including a source of a coherent light beam of low divergence for quickly and simultaneously establishing a plurality of reference lines or planes for use in leveling, squaring, plumbing, and other alignment functions and for controlling the operation of construction equipment is disclosed. The present invention is a circuit that finds particular utility in automatically adjusting the orientation of the tool. More particularly the present invention is a circuit for comparing the amplitude of a first alternating current signal to the amplitude of a second alternating current signal, such signals being in phase with one another and having the same frequency.
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Cited Art Landscape
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