Free_running_multivibrator

Published:2009/7/24 9:03:00 Author:Jessie | From:SeekIC

This circuit uses an LM111 comparator to produce a 100-kHz square-wave output. The frequency can be changed by varying C1, or by adjusting R1 through R4, while keeping the ratios constant. Because of the low input current of a comparator, large circuit impedances can be used. Thus, low frequencies can be obtained with relatively small capacitor values (compared to most op amp MVs). A1-Hz output requires a 1-μF capacitor. The speed of the comparator also permits operation above 100 kHz. National Semiconductor, Linear Applications Handbook, 1991, p. 132.



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