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74190 chip question

jpd

New Member
Hello. I have to do a proyect for the university. I need to make a counter that goes like this. 0 1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1 0 1 2... I alredy mounted the circuit but I don't now how to make it count back when it reaches 9. I did it with an interruptor but the idea is that it work automatically. Anyone knows how to do it?
 

JimB

Super Moderator
Most Helpful Member
Anyone knows how to do it?
My first thought is to build some logic which can detect when the counter output is "9", the logic will then set the up/down input of the 74190 to DOWN.
Also, have some logic which detects when the counter output is "0", that logic will then set the up/down input of the 74190 to UP.

JimB
 

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