I don't know what this electronic circuit does

[jacklll]

I have a homework question that asks me to draw up a truth table for the attached circuit.

As you can see I did this (I think correctly). There is also an attached question asking what function the circuit serves - I am not sure what function this is

Any pointers appreciated.

 

[NascentOxygen]

Hi jackill.

Why did you call one output "sum" and the other "carry"?

 

[Janus]

Along the same lines as NascentOxygen's post, What do you think "D" and "B" could stand for?

 

[jacklll]

Oops - I originally thought this was a half adder but later figured that wasn't correct. I forgot to change the boxes before I uploaded the image.

 

[berkeman]

LOL, I tried to cheat and use Google Images to match on the circuit posted. This was the return...

About 3 results (0.77 seconds)

Image size:
800 × 450
No other sizes of this image found.
Best guess for this image: screenshot

 

[George Jones]

Oops - I originally thought this was a half adder but later figured that wasn't correct. I forgot to change the boxes before I uploaded the image.

I guess there is a difference between what this circuit does, and what you thought the circuit did.

 

[gneill]

LOL, I tried to cheat and use Google Images to match on the circuit posted. This was the return...

About 3 results (0.77 seconds)
View attachment 225514
Image size:
800 × 450
No other sizes of this image found.
Best guess for this image: screenshot

Narrow down the image to just the circuit:

Then search again

 

[Janus]

Oops - I originally thought this was a half adder but later figured that wasn't correct. I forgot to change the boxes before I uploaded the image.

Hint: You weren't too far out of the ball park.

 

[Chris Riccard]

what your not seeing is an exclusive xnor gate

 

[jacklll]

OK guys, the deadline is up and I couldn't figure it out using your hints :(

Really appreciate the efforts though and I will format my question better next time as per the forum rules.

 

[berkeman]

OK guys, the deadline is up and I couldn't figure it out using your hints :(

See the hint in post #7 above.

 

[George Jones]

OK guys, the deadline is up and I couldn't figure it out using your hints.

My previous post contained an (intended) obscure hint:

there is a difference

I figured it out form your truth table, and from

Along the same lines as NascentOxygen's post, What do you think "D" and "B" could stand for?