7 segment & 4-bit counter

Thread Starter


Joined Apr 26, 2007
I need to help about this.it should counts 1,3,5,7,9,1,3,5,.... like this.How can make this circuit? (with JK Flip Flop)

sorry for my terrible english:(



Joined Apr 2, 2007
its obvious u'll need 4 - J K ff.
now the connections will be little bit similar like normal counter.
what u'll have to do here is make the truth table for each j k ff
which takes into account the previous and next state of
the flip flops depending on which u'll get 4 k map to solve.
thus u'll get the required inputs for the j k inputs of each ff.

one more thing for j k ff and s r ff as well as t and d ff
there is a truth table that tells abt the input needed for a certain change of o/p frm previous state to next state.
your problem needs this information,it can be found in any good book i believe.

i can only help u this much because my knowledge of electronics is rusty
also a good book on k map will have a similar problem solved in it,
try referring to it.

if u read my other posts u'll see similar answers :)
which only implies that k map and Quinn McCluskey methods shud be learned by everyone
who pursues electronics it makes life lot easier.