TIMER_AS_OSCILLATOR

Published:2009/7/2 9:18:00 Author:May | From:SeekIC

Output of National LM122 timerisfed back to trigger input through capacitor to give self-starting oscillator. Frequency is 1/RtCt. Output is narrow negative pulse havipg duration of about 2R2Cf. Conservative value for Cf for optimum frequency stability can be chosen from graph based on size of timing capacitor Ct.-C. Nelson, Versatile Timer Operates from Microseconds to Hours, National Semiconductor, Santa Clara, CA, 1973, AN-97, p 10.



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