Mod 10 down back to 8 and does not pass 7

Can someone move this to the forum of Multisim? I can only put in Circuit Design Suite.

In any case, I have problems with Multisim. I made more complex circuits, but somehow, I lost my memory and cannot remember it clearly. So I go on Digital Electronics 1, I'm ready for Digital Electronics 2.

I am a 15 low meter mod. To happen 15 to 0 easily, but I want him to be 9-0, then the display shows 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 and 'LOAD' then 9 and countdown again.

Without the charge, he would go 15 - 0 and reset.

So in class, we learned at 15 (1 1 1 1) NAND to load presets ABCD, I used a switch is customizable. I use 1001 for 9-0, but he is always put back to zero (load) to 7... So there are 9, 8, 9, 8, 9, 8, 9, 8 and so on.

It will count down to 0 and go back to 15, but at 15 he flip 1111 to a low and will activate the load and given to 9. I can't get it past 8. I can move the ABCD to 6, and it works perfectly. It will go from 6 to 0 and then load back to 6 and repeat. When I try from 9 to 0, it just will not work.

Any idea? Someone asked me (since I took the Multisim from Digital Electronics 1 section and he took the model section) if it must use the DIP switches and how the teacher said no cause of bounceback? She also told my partner to use only one... but I don't remember if it was instead of the clock, OR switches. I see people on Multisim using buttons instead of my switch. What is the problem?

In addition, my display 7 segments will not work correctly.

So, my teacher asked me what was the model number for the NAND and I didn't.

She told me to Google the model number and then use in Multisim.

I've done that I have placed a NAND4 - not a 7420N.

I knew that the NAND dirtied with the count of 9-0. So, we replaced by a 7420N and there are now 9-0.

To display, I did it properly and did so my classmates - but the default is 7446 somehow does not work and shows the numbers in front of what he has. So ONE looks like a three backward, because it lights the LED must be off.

So we fixed it by replacing the component with a 7447.

If I would have stuck with my instincts and tried to replace it with a 7447, I would have done this a week ago. However, the document specified using a 7446, LAB so I don't think it was a problem.

To someone else as the question with a MOD 10 countdown with a NAND4, use a 7420N in replacement of the NAND4.

It is fixed.

Tags: NI Software

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