ring counter using timers

90 ring counter using timers The 558 quad timer hides four independent timers that are able to generate pulses with a pulsewidth ranging from microseconds to hours. The timers can be arranged in series without the use of coupling capacitors. When the output of the last timer is connected to the input of the first one, there 2 START RESET 01 02 03 04 Tx = Rx • Cx emerges a very simple ring counter. Will become logic 1 (see pulse diagram). After a period determined by R1 and C1 the level at output Q1 returns to logic 0 which triggers the second counter, with logic 1 appearing at output Q2, etc. The logic 1 level therefore skips from output to output. A logic 0 level at the common reset input will set all outputs to logic 0. nee not g necessarily The RC periods of the timers d ive output all be the same; different RC periods the signals with different pulse widths. The vtahleuepeorfiods i resistors (R1 to R4) which determineobtai nlonger should be between 2 k and 100 k. T periods, ...