Sorry ive just got back from work
I think the first answer would be ba NOT gate.
Then that goes into another NAND with the inputs tied together. so its inverted again which makes it a double invertion at the output Y.

Hope im right..

 

But which basic gate is it!?

You have the truth table

A|B|Y
0|0|0
0|1|0
1|0|0
1|1|1

What basic logic gate is that the truth table for?

 

sorry, thats an AND gate

 

But which basic gate is it!?

You have the truth table

A|B|Y
0|0|0
0|1|0
1|0|0
1|1|1

What basic logic gate is that the truth table for?

Sorry, Thats an AND gate.

 

Exactly. So now you know how you can take a schematic that has INV, AND and OR gates and replace the INV and AND gates with NAND gates. All that's left (for the basic gates) is to be able to replace an OR gate.

So... if you invert the output of a NAND you get an AND.

What happens if you invert the inputs?

 

Ok. Ill do that and let you know.
Im off to work again.
Thanks a lot.

 

Exactly. So now you know how you can take a schematic that has INV, AND and OR gates and replace the INV and AND gates with NAND gates. All that's left (for the basic gates) is to be able to replace an OR gate.

So... if you invert the output of a NAND you get an AND.

What happens if you invert the inputs?

Helloo.
Iv just got back from work and i have attached the drawn diagram of the diagram replaced with the 2 input NAND and i wondered if it is right?

Thanks

 

Yes, that looks correct. But be sure that you include the inversion bubbles on your inverters, otherwise they are non-inverting buffers.

 

Yes, that looks correct. But be sure that you include the inversion bubbles on your inverters, otherwise they are non-inverting buffers.

Thanks very much. your nudge, nudge, wink, wink approach worked.
I appreciate your help. Thanks a lot.

 

Thanks very much. your nudge, nudge, wink, wink approach worked.
I appreciate your help. Thanks a lot.

I'm glad it worked. It's called the Socratic Method and is a few thousand years old. The basic idea is for the mentor to ask leading questions that guide the student toward the answer through a process of step-by-step self-discovery. It's a very powerful technique, but it requires that both the mentor and the student be willing to participate and be willing to struggle a bit.