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Is that ok !

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blowouter

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i simulate in proteus a digital clock project using 7490 ic , the seconds is ok but the minutes is not sixty exactly it's 75 seconds i think my circuit is ok but is that error in circuit or in proteus
thanks in advance.
 
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I believe no one here is clairvoyant. Without seeing the circuit and the simulation it's rather difficult to help you. :rolleyes:
 
i remove the clock circuit that give 1hz and replace it with clock generator in the program and the same delay again
here is a photo View attachment 68433
i tried using my phone clock and found proteus minute is extra by same period . is that usual
 
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