18_20000_Hz_SINE_SQUARE

Published:2009/7/7 1:42:00 Author:May | From:SeekIC

Circuit uses two opamps to obtain necessary positive feedback for sustaining osdllation. RC network of first stage acts astuned circuit, permhting operation only at frequency determined by values of R and C. Pot R3 provides tuning over significant frequency range. Pot R8 controls amplitude of sine output. Zener X1 stabilizes amplitude of square output. Sine signal is applied to LM111 acting as limiter to provide desired square wave. Table gives values of C1 and C2 for five different frequency ranges.-E. M .Noll, Linear IC Principles, Experiments, and Projects, Howard W.Sams, Indianapolis, IN, 1974, p 123-124.



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