1_kHz_SINE_SQUARE

Published:2009/7/6 23:32:00 Author:May | From:SeekIC

555 timer starts as astable MVBR but then acts withA2 to form multiple-feedback bandpass filter that removes harmonics from square wave to give sine-wave output with distortion less than 2%. Sine output is fed back to timer through C4 which now operates as Schmitt trigger, shaping sine wave to give output square wave. Frequency is determined primarily by filter components C1 C2 R1, and R2. Output is about 9 V P-P.-W. G. Jung, IC Timer Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 203-204.



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