Here you go I figured it out in the end, probably worth checking of course . Just required some feedback from the second JK and a different initial state. This will now follow your required state diagram. Bear in mind this uses momentary (push to make) and not latching switches and you still need to determine your resistor values for the pull ups and base resistor and what NPN would be appropriate. Not sure what voltage (or current draw) your motor is but these TTL ICs need a 5 volt regulated supply so if your supply is higher than that for you motor you can just put a 7805 regulator in for the logic. You might also want to consider a general power switch further upstream in the circuit just so the power to the logic etc. isn't always on, unless you want it to be of course .

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I try this circuit, it has one problem at state 1, is that when you connect the circuit, the motor turn on directly without pressing any button. how to solve this issue please

 

I try this circuit, it has one problem at state 1, is that when you connect the circuit, the motor turn on directly without pressing any button. how to solve this issue please

Unfortunately my diagram as it is won't work with a 7476 because that is positive edge triggered, has a preset function and as a result has slightly different states than the 7473.

 

Unfortunately my diagram as it is won't work with a 7476 because that is positive edge triggered, has a preset function and as a result has slightly different states than the 7473.

Ah ok, because I have only the 7474 and the 7476, any idea how to do the circuit by using the 7474's or 7476's ?

 

Ah ok, because I have only the 7474 and the 7476, any idea how to do the circuit by using the 7474's or 7476's ?

Try it with the 7476 instead but hold the preset pins of each high at 5V permanently, see if that helps. It's definitely a 74xx76 and not a 74xx76A?

 

Try it with the 7476 instead but hold the preset pins of each high at 5V permanently, see if that helps. It's definitely a 74xx76 and not a 74xx76A?[/QUOTE
Thanks, I will try this and see what happen. It is definitely 7476

 

This has simplified it a little more and it works in sim with a 74HC76 on mine I think that has the same function table as the 7476 but there are a few variations on that IC.



FYI S is PR in this diagram