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dlkosmas

Digital Counter

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Does anyone know how to design a digital counter that produces a specific number of non-sequential number? for example( decimal) : 1,5,3,7,9,12
and then repeat it using flip flops? If you know any good site i would appreciate it

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Well take an normal counter.Attach an AND gate to its output such that it selcts the number you require.

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I feel its impossible to make the counter from a D flip flop or JK flip flop. These FF increase or decrease by the count of 1. You cannot get the sequence which you need.

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It sounds as if you are looking for combinations of modulo counters, which you want to construct. Here is a link that might help you:
http://www.colorado.edu/physics/phys3330/PDF/Experiment10.pdf

My personal method would be to use a microcontroller. One chip would do it all and more.

MP

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What do you want to use simple LEDs or a LED display?
Dont mind but i want to ask why do you only want to make it from scratch? ???
Where do you want to apply it?

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Ok,i did it using 4 D flip flop and present state-Next state tables.Then with Karno maps i found the logical equation for each output(LED)
Complex but yet doable.

It is easy to do it using a microprossecor.I just want to start programmin PLDs.

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