1_Hz_LAMP_BLINKER

Published:2009/7/5 22:53:00 Author:May | From:SeekIC

Single CMOS flip-flop generates approximately constant low-frequency signal from variable high-frequency signal. RC network in feedback loop determines output frequency, which is independent of rate at which flip-flop is clocked if output frequency is lowerthan dock frequency. If clock frequency is lower, output transitions occur at half of clock frequency. Provides two outputs, approxi-mately equal in duty cycle but opposite in phase. Circuit was developed to blink lamp at 1 Hz to indicate presence of active digital signal having variable duty cycle in range of 100 to 3000 Hz.-V. L. Schuck, Generate a Constant Frequency Cheaply, EDN Magazine, Aug, 20, 1975,p 80 and 82.



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