Creating a circuit with only NOR gates

Thread Starter

anonkun123

Joined Mar 31, 2020
10
How do I get create a circuit with only NOR gates using the following diagram below? I'm only able to come up with a circuit with only NAND gates, but not NOR gates. How do I convert an inverted-input OR gate to NOR gate? I know a normal OR gate will translate to a NOR gate followed by an inverter, so is it the same for an inverted-input OR gate (to convert it into NOR)? I also know that a AND gate is a NOR gate with inverted inputs.

Post image
 
Last edited:

WBahn

Joined Mar 31, 2012
25,785
What happens if you break a signal and insert two inverters in series?

So what happens if you put an inverter at the output of one of your OR gates and another inverter at the corresponding input to the AND gate?
 

KeithWalker

Joined Jul 10, 2017
919
I designed the logic for an automatic machine to stack different shaped boxes of pet food on pallets using Nor gates (Norbits) back in 1966 because they were the only logic blocks available at that time.

First, write a truth table for the circuit you have, then use Nor gates to make it happen.
Remember:
A Nor inverts.
A high Nor input gives a low output. .
A Nor gate will And and invert two low inputs.
Have fun.
Keith
 
Last edited:

dl324

Joined Mar 30, 2015
10,775
Welcome to AAC!
How do I get create a circuit with only NOR gates using the following diagram below? I'm only able to come up with a circuit with only NAND gates, but not NOR gates
Show us the circuit with NAND gates and explain how it was derived.

What theorems have you studied?
 

dl324

Joined Mar 30, 2015
10,775
would this be a correct answer? for NOR gates
You should be telling us.

Why did you change the "topology" of the gates? If you wanted to avoid wire crossings, you could have put D above B. Neatness counts when drawing schematics:
1585665713049.png
Why are you inverting B and D when you already had the inverted signals available? What is the purpose of two consecutive inverters?
 

Thread Starter

anonkun123

Joined Mar 31, 2020
10
Why are you inverting B and D when you already had the inverted signals available? What is the purpose of two consecutive inverters?
1585666987075.png

I made a mistake just now and I have since corrected the diagram. Would this be a better solution?
 

MrChips

Joined Oct 2, 2009
21,164
Why are you making life difficult?

Start with the original logic.

(/B OR /D) AND (B OR C)

You only have a single AND gate to convert to OR gate. Use DeMorgan's Theorem.

I can draw the logic diagram if you need me to do that.
 
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