Hi ! I am trying to make 0-9 up/down counter with JK Flip-Flop using AND, OR and NAND gate....Im newbee in this so How I do this... This is my assignmentThere are several approaches to digital design of counters/state-machines, but one of the easiest is to find a circuit that functions close to what is needed and modify it. For instance, take a modulo-16 up/down counter and convert it into a 1-9 up/down counter (as shown in the attachment). The comparison diagram shows that the mod-16 counter works the same as the mod-9 counter except when the down-count reaches "1" & when the up-count reaches "9". The yellow-shaded transitions indicate the differences where the individual flip-flop toggling needs to be forced or inhibited to achieve the desired operation. And note that the set/reset FF inputs are only used to set the initial state.
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