# logic gates and boolean help in logicsim

Discussion in 'General Electronics Chat' started by jamesboxer, Oct 28, 2011.

1. ### jamesboxer Thread Starter New Member

Oct 28, 2011
5
0
Hi
I need help with logic sim, i need to construct a NOR or XOR circuit using NAND gates only.
I have created one already, just wanted to make sure it was correct, I have input 1 and input 2, going into a NOR gate and then output 3.
Is this correct? Or do I need to add a NAND gate in there somewhere..

Also i need to construct a truth tabele for boolean function,
M = x *(y * inverted Z + inverted x * y)
Then I need to build a circuit in logic sim for this..

Can anybody help with these two questions,
thanks

2. ### zgozvrm Member

Oct 24, 2009
115
2
Show us a diagram of your solution.

3. ### djsfantasi AAC Fanatic!

Apr 11, 2010
2,899
870
Is this homework? If your requirements are to implements a NOR or XOR circuit using NAND gates only, then you shouldn't be wiring up NOR circuits in Logicsim; find the equivalent circuit for the NOR function using ONLY NAND gates. A quick Google search for "NAND gate equivalents" will provide you with many resources. Then wire that circuit in Logicsim.

You should show us your work in how far you can get constructing the truth table, first.

4. ### jamesboxer Thread Starter New Member

Oct 28, 2011
5
0
Yes this is homework. I have created a diagram of the logic sim, it worked fine though but im not sure if it is correct to make the diagram this way. But I have to make a NOR circuit using NAND gates only so i thought this was the correct way. Please check the diagram below with the truth table, thanks

File size:
309.4 KB
Views:
30
5. ### jamesboxer Thread Starter New Member

Oct 28, 2011
5
0
hi could you let me know, thanks

6. ### jamesboxer Thread Starter New Member

Oct 28, 2011
5
0
hi please could you let me know, thanks

7. ### SgtWookie Expert

Jul 17, 2007
22,183
1,728
No, your schematic is not correct.

You need to use only NAND gates, yet you have a NOR gate in there.

The connections you have made to the NAND gates on the left will not result in a NOR gate output.

Start by writing down the NOR and NAND gate truth tables. You have the NAND truth table already. Then figure out how you can create a NOR gate using only NAND gates.

These forums are not interactive. It may take hours or even days to receive a reply.

You have posted in the wrong forum. You should have posted in the "Homework Help" forum instead. Expect a Moderator to move it there when one of them sees it.

8. ### jamesboxer Thread Starter New Member

Oct 28, 2011
5
0
many thanks for your reply, i realised what i was doing wrong literally a few hours after i posted the thread haha, thanks, im still abit stuck on the boolean function though, ive drawn a truth table but i dont think its correct :/
could anyone still help me on that
thanks