How to Convert AND/OR Circuits to NAND/NAND Using Only NAND and NOT Gates?

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To convert AND/OR circuits to NAND/NAND using only NAND and NOT gates, start by analyzing the truth table and Karnaugh maps to identify the logic functions. A 3-input AND gate can be implemented using two 2-input NAND gates, where the output of the first NAND feeds into a second NAND along with the third input. For a 4-input AND gate, use three 2-input NAND gates to achieve the same result. The key is to apply De Morgan's theorem to transform the logic expressions appropriately. Visualizing the circuit can simplify the conversion process significantly.
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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!
 
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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
 

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