# I need help with basic logic circuit

#### farhan_w24

Joined Mar 16, 2018
7
Here's the following expression:

Q= (A . B. C) + (A. B. C) + (A. B. C)

Underline ( for bar)

Here is my following image for logic circuit

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#### dl324

Joined Mar 30, 2015
15,097
Welcome to AAC!

Cropped and edited to the relevant portion:

Is this school work?

#### farhan_w24

Joined Mar 16, 2018
7
Yes for an assignment

#### farhan_w24

Joined Mar 16, 2018
7

#### dl324

Joined Mar 30, 2015
15,097
Yes for an assignment
How are you supposed to verify whether it's correct?

Is there a reason why you didn't use 3 input AND and OR gates?

#### farhan_w24

Joined Mar 16, 2018
7
How are you supposed to verify whether it's correct?

Is there a reason why you didn't use 3 input AND and OR gates?

It doesn't exist within the library on circuit wizard

#### ebp

Joined Feb 8, 2018
2,332
It needs to have some boolean algebra applied.

#### WBahn

Joined Mar 31, 2012
27,383
You haven't given any indication of what you need help with. You've given a Boolean expression and you've given a logic circuit. But no hint as to what it is you are trying to do.

Also, whatever it is, YOU need to show YOUR best attempt at it so that we can try to guide you from where you are to where you need to get.

#### farhan_w24

Joined Mar 16, 2018
7
You haven't given any indication of what you need help with. You've given a Boolean expression and you've given a logic circuit. But no hint as to what it is you are trying to do.

Also, whatever it is, YOU need to show YOUR best attempt at it so that we can try to guide you from where you are to where you need to get.
Can we please start from scratch. I am trying to convert the Boolean expression Q= (A . B. C) + (A. B. C) + (A. B. C) into a logic circuit. However, I don't know how to proceed hopefully, this is more clarified on what I want to do.

#### dl324

Joined Mar 30, 2015
15,097
Can we please start from scratch.
Do you think there's something wrong with the solution you posted?

How are you supposed to verify the solution? In the simulator? Or some other method?

#### ebp

Joined Feb 8, 2018
2,332
You have an expression that is the sum of three minterms. Are you supposed to implement a circuit using minterms, or should you be considering some simplification?

#### farhan_w24

Joined Mar 16, 2018
7
You have an expression that is the sum of three minterms. Are you supposed to implement a circuit using minterms, or should you be considering some simplification?

But if anyone of you were to convert the boolean expression into the logic circuit what would it look like. That's what I want to know because I think my circuit is over complicated

#### ebp

Joined Feb 8, 2018
2,332
We still don't know exactly what you want to do. You said you had only 2-input gates. Do you think your circuit as previously shown is correct, regardless of possible excessive complexity?

Why do you think there should be a simpler version to implement the same logical function? Are you allowed or expected to simplify the logic expression before you convert the expression to a circuit? That is why I asked about implementation as sum of minterms.

What methods do you know how to use to approach simplification of a Boolean expression?

Unless someone happens by who doesn't realize this is a homework problem, no one here is going to just show you a circuit. The idea of doing homework is to learn things.

#### dl324

Joined Mar 30, 2015
15,097
I think my circuit is over complicated
What techniques can you use to see if it can be simplified?

#### farhan_w24

Joined Mar 16, 2018
7
What techniques can you use to see if it can be simplified?
Karnaugh map?

#### dl324

Joined Mar 30, 2015
15,097
Karnaugh map?
You tell us.

We don't know what you've studied or what you're studying now; so we can't tell you what method your instructor expects you to use.

#### WBahn

Joined Mar 31, 2012
27,383
Can we please start from scratch. I am trying to convert the Boolean expression Q= (A . B. C) + (A. B. C) + (A. B. C) into a logic circuit. However, I don't know how to proceed hopefully, this is more clarified on what I want to do.
So where did the logic circuit that you posted in your first post come from?