Comparator timer with dual function adjustment

Details Comparator timer with dual function adjustment Comparator timer with dual function adjustment

1983-06-30

1985-06-04

Grimm, Siegfried H.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307273, 307601, 307608, 328 55, 328 58, 328207, H03K 5159

Patent

active

045216940

ABSTRACT:
A comparator timer 2 is disclosed in which charging current and threshold trip voltage are both adjusted with a single potentiometer 6. Moving the pot wiper 8 in one direction increases the threshold trip voltage at the reference input terminal 12 of the comparator 4, such as the minus terminal of an operational amplifier, and at the same time decreases the capacitor charging current to the comparing input terminal 16, such as the plus terminal of the op amp, to lengthen the timing interval. Moving the pot wiper 8 in the other direction decreases threshold trip voltage and concurrently increases capacitor charging current to shorten the timing interval. The circuit affords expanded timing range, reduced power consumption and improved adjustment resolution, which are ideal for proximity switch applications, particularly photoelectric type proximity switches.

REFERENCES:
patent: 3073972 (1963-01-01), Jenkins
patent: 3569842 (1971-03-01), Schroyer
Graeme, "Applications of Operational Amplifiers", 1973.

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