ADJUSTABLE_SQUARE_WAVES

Published:2009/7/15 4:57:00 Author:Jessie | From:SeekIC

Q1 and Q2 form flip-flop, with UJT Q3 connected as time delay. When power is applied, one flip-flop transistor conducts and C1 charges through one pot and diode. When C1 reaches firing voltage of UJT, it conducts and resulting output pulse triggers flip-flop, Sequence of events now repeats, with C1 charging through other diode. By proper selection of C1 and pot values, circuit becomes square-wave generator with each pot controlling duration of one half-cycle. With one pot replaced by fixed resistor, circuit becomes pulse generator with other pot controlling pulse-repetition rate. If equal-value fixed resistors replace pots and R1 is changed to pot, circuit becomes symmetrical square-wave generator with pot controlling frequency,-I. Math, Math's Notes, CQ, April 1974, p 64-65 and 91-92.



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