BIPOLAR_PULSE_TRAINS

Published:2009/7/15 1:58:00 Author:Jessie | From:SeekIC

Output of Signeties 555 timer F, consisting of unipolar waveform varying from ground to +5 V, is converted to bipolar pulse train having duration equal to that of output pulse from lower 555 timer. While P is high, comparator 2 is on, forcing R2 to ground and placing base of Q1 at 2.5 V (because comparator 1 is off, forcing R1, high). Comparator 2 goes off when timer P goes low, and action of comparator 1 is turned on and off by timer F to produce bipolar pulse train at E0.-G. L. Assard, Derive Bipolar Pulses from a Unipolar Source, EDN Magazine, April 5, 1977, p 144.



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