1_s_H_16_H_PRECISION

Published:2009/7/12 22:26:00 Author:May | From:SeekIC

Accuracy is comparable to that of 60-Hz power-line frequency. After Fladio Shack 276-561 6-V zener divides powerline frequency by 2, 7490 decade counter provides division by 10 to give 3 Hz. 555 timer connected as mono MVBR is then adjusted with R4 to divide by 3. LED then flashes at precise 1-s intervals, staying on about 100 ms, T1 is 6.3-V filamenttransf ormer.-F. M. Mints, Integrated Circuit Projects, Vol. 5, Radio Shack, Fort Worth, TX, 1977, 2nd Ed., p 21-29.



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