Please help..circuit logic problem.

[mathrocks]

I have to make a circuit using only NAND and NOT gates to drive a 7 segment LED. My problem is that after I make the truth table and draw the karnaugh maps I of course end up with a AND/OR circuit...how exactly can I convert the AND/OR to a NAND/NAND. Also, how can I break up the 3 and 4 input AND gates to 2 input NAND gates.

I really need help with this, I've been racking my brain trying to figure this out.

Thanks alot!

[Cliff_J]

Ok, think of this. Take a simple NAND truth table.

NOT the output. You get ________

NOT the two inputs. You get ________

A 3 input AND can be 2 inputs into an AND with output fed into another AND along with the third input. A four input, use three ANDs. Etc.

If you draw it out I believe its that simple.

Cliff