Comparison circuit for alignment apparatus

Details Comparison circuit for alignment apparatus Comparison circuit for alignment apparatus

1979-05-08

1981-12-15

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307355, 328147, H03K 524

Patent

active

043061931

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.

REFERENCES:
patent: 3470388 (1969-09-01), Scarpa
patent: 4079250 (1978-03-01), Jeffcoat

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