20_20000Hz_SINE_SQUARE

Published:2009/7/6 4:35:00 Author:May | From:SeekIC

Opamp is used as tuned circuit driven by square wave from yoltage comparator Frequeny is controlled by R1-R3, C1, and C2, with R3 providing tuning.Comparator is fed with resulting sine wave to obtain square wave for feedback to input of tuned circuit, to cause oscillation. Zener stabifizes amplitude of square wave that is fed back.R6 and C5 provide DC negative feedback around comρarator to ensure starting.Values of C1 and C2 are equal,and range from 0.4 μF for 18－80Hz to 0.002 μF for 4.4-20 kHz.－''Easily Tuned Sine Wave Oscillator,″National Semiconducotor,Santa Clara,CA,1971,LB-16.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Signal_Processing/Sine_Signal_Generating/20_20000Hz_SINE_SQUARE.html

Print this Page | Comments | Reading(3)