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2016-08-16 13:19  
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In this circuit, timer 1 is operated in the astable mode, and timer 2 is operated monostable; timer 1 triggers timer 2. The output (pin 9) has the same frequency as timer 1, but with a duty cycle determined by the timing cycle of timer 2. The output duty cycle can be adjusted from 1 to 99% by R2, typically a 10-kΩ potentiometer. EXAR Corporation Databook, 1990, p. 5-222.