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You could replace the octal counter with a hex counter (3 stage johnson counter), you'd only need 6 buttons, pots and switching transistors too.For the people asking about the 555 timer, just look up how to wire a 555 in astable mode. You can add a pot to the 555 to make the tempo adjustable. Output from 555 (pin 3) connects to the clock pin on the counter
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