Hi, I've made a truth table for this circuit and have come to the conclusion its a buffer for B but I'm not sure this is right. Can someone let me know how they would have gone about it. Is it another logic gate, arithmetic function or memory?

 

here's the circuit

 

Welcome to AAC!

Put labels for A, B, and Z on the schematic.

Are we to assume that a HIGH from the OR gate turns the light on?

 

Welcome to AAC!

Put labels for A, B, and Z on the schematic.

Are we to assume that a HIGH from the OR gate turns the light on?

Yes and I think I initially did the truth table wrong and now think the circuit is equivalent to a buffer for B. Is there any other useful function of this circuit?

 

I also think I know what this circuit is but i think I'm missing the point but I don't see how it could be anything like addition.

 

Yes and I think I initially did the truth table wrong and now think the circuit is equivalent to a buffer for B. Is there any other useful function of this circuit?

If it's a buffer for B, that means that A has no effect on the circuit.

But what if A is HI?

 

Sorry for the confusion this is the actual first circuit and I am saying the whole circuit acts as a buffer for B

 

What happens when A is LO and B is HI?

What happens if, from that condition, B is taken LO?

 

If A is LO when B is HI then assuming Z starts from LO it will change to HI. So so I assume that Z is still at HI? if it is then it will remain there? So is it acting as memory for B?

 

If has a memory aspect to it, but whether "acting as memory for B" is a reasonable description depends on what, exactly, that phrase means. If it's memory for B, what purpose does A serve?

Are you familiar with RS latches? Can you recast this circuit into one of the classic latch circuits?

 

If has a memory aspect to it, but whether "acting as memory for B" is a reasonable description depends on what, exactly, that phrase means. If it's memory for B, what purpose does A serve?

Are you familiar with RS latches? Can you recast this circuit into one of the classic latch circuits?

Thank You for your help, I have run a simulation of this circuit and understand it mostly. I can see that it stores the value of B when A is LO and B is HI even after B is reverted to LO as long as A remains LO Z is HI. The same applies the otherway A can reset the output to LO by changing it to HI and the circuit remains at LO even if A is changed to HI.

Can you help me on this circuit? is there a connecting function of X,Y or are they just separate logic gates XOR and NOT for B?