60_Hz_WITH_50_DUTY_CYCLE

Published:2009/7/15 20:57:00 Author:Jessie | From:SeekIC

Adding single resistor R2 to standard oscillator connection of 555 timer permits operation with 50% duty cycle independently of frequency as determined by value of C1.For 60-Hz output, VCC is 10 V, C1 is 1 μF, R1 is 10K, and R2 is 75K.-R. Hofheimer, One Extra Resistor Gives 555 Timer 50% Duty Cycle, EDN Magazine, March 5, 1974, p 74-75.



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