MICROSECONDS_TO_HOURS

Published:2009/7/12 22:42:00 Author:May | From:SeekIC

Timing range of 555 is increased 100 times by using 3140 FETinput opa mp in circuit that eff ectively multiplies values of timing components and buffers timing network, Pin 7 of 555 switches applied voltage of timing network between V+ and ground. Ratio selected for R2-R3 can be varied over wide range to change multiplying ratio, provided square-wave voitage across R3 is at least 50 mV. Output is essentially pure square wave. Supply voltage is notcritical.-W. G. Jung, Take a Fresh Look at New IC Timer Applications, EDN Magazine, March 20, 1977, p 127-135.



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