Simple PWM Circuit of Direct Modulation Self Excited Oscillation Circuit

Published:2011/6/9 22:24:00 Author:Michel | Keyword: Direct Modulation, Self Excited, Oscillation Circuit, Simple PWM Circuit | From:SeekIC

Circuit's FunctionsThe astable multivibrator which uses OP amplifier can get the oscillation ouput which has symmetrical postive and negative 1:1 dutyfactor.The pulsewidth can be modulated if the threshold voltage is altered from the outside and this circuit is very simple.Using CR charing and discarging circuit has a bad influence on the large modulation input linear.The oscillation frequency stability depends on the time, so often CR stability is not high. However,it can be used as a PWM power to control circuit. Circuit's Work PrincipleIn this circuit,, oscillation frequency voltage depends on lagging voltage +VE and -VE's cycles if there is no input resistance R2.



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