# 7 segment & 4-bit counter

Discussion in 'Homework Help' started by starskyinn, Apr 26, 2007.

1. ### starskyinn Thread Starter New Member

Apr 26, 2007
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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

fuku-Uz-bipcik

2. ### recca02 Senior Member

Apr 2, 2007
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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.

which only implies that k map and Quinn McCluskey methods shud be learned by everyone
who pursues electronics it makes life lot easier.

3. ### zongo New Member

Mar 17, 2009
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hi.can i get functions for seven segment display from which i can draw circuits,please...

4. ### beenthere Retired Moderator

Apr 20, 2004
15,815
282
Take the output from the flip flops as the BCD input to a 7 segment driver. Look up a 7447 or a 4511 for examples.