4 bit subtractor

171

01:49:45

This circuit subtracts the numbers in the displays 

published 5 years ago

MatthewKessler

5 years ago

How does it work??!?

Mohit_Hemaprasad

5 years ago

Just like how you would subtract two numbers from fourth grade. This circuit does it the same way but in binary.

fatcat2

5 years ago

We can make a switchable adder/subtractor using XOR gates.

Mohit_Hemaprasad

5 years ago

How can we do that? Can you give me a switching logic? @fatcat2

Redcrab

5 years ago

somethin wrong somewhere ... when i try 8-1 or 1-8 none return 7... but works for 8-4

Mohit_Hemaprasad

5 years ago

Cool thanks for pointing that out I’ll look into it 🤔

fatcat2

5 years ago

@Mohit_Heamaprased, I'm really sorry for the late reply. I was sick with fever. Now it's OK. Subtraction is basically taking the 2's complement and adding. This function is performed by an XNOR gate. Use it. With this, you can make a switchable adder/subtractor. As easy as that.

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