XOR CIRCUIT

[AnalogKid]

How the second transistor from the left reaches the ON state.

After all, there is no closing of a circuit from the positive voltage of the voltage source, the current can not reach the negative voltage source, because it is stopped at the collector of the first transistor from the left,

Incorrect.

There is a current path, but it is impossible to describe without reference designators.

ak

 

[Grossel]

Um, what is the question anyway ?

Please add reference designators to all components in the schematic and repost.

Ah, I keep on learning (English terms). I've always used to call this "component ID" but thanks to you I know the correct English term now.

 

[sxy]

YOU CAN SEE FROM THE schematic THAT THE TRANSISTOR A IN THE BOTTOM WILL NOT CLOSE A CIRCUIT IF YOU ATTACH A VOLTTAGE IN THE BASE
BECAUSE THE COLLECTOR OF TRANSISTOR B WILL STOP THE CORRENT TO GET TO THE GROUND,
WHENEVER TRANSSTOR B IS OFF.

 

[sxy]

SO HOW YOU PUT TRANSISTOR A IN THE BOTTON TO BE ON.

 

[sxy]

IF THE CURRENT THAT YOU ATACH ON THE BASE OF TRASISTOR A IN THE BOTTOM CAN NOT REACH THE GROUND, THAN IT WILL NOT EXIT FROM THE POSITIVE VOLTAGE SOURCE AT ALL.

 

[sxy]

WHAT IS THE CURRENT PATH OF TRASISTOR A IN THE BOTTOM?

 

[AnalogKid]

WHAT IS THE CURRENT PATH OF TRASISTOR A IN THE BOTTOM?

I'll tell you after you add reference designators to all components and re-post your schematic.

Do not post in all capital letters. We can't take your questions seriously when you act as a child.

ak

 

[Visitor]

TYPING IN ALL CAPS AFTER BEING TOLD NOT TO IS NOT A WAY TO GET HELP HERE.. DEMANDING ANSWERS DOESN’T WORK EITHER.

 

[crutschow]

sxy, if you going to act as a Troll, please do it somewhere else.

 

[rjenkinsgb]

It's a two transistor "AND" gate circuit - if BOTH are turned on, the two in series pull the upper collector voltage down to a low level; that forms a "NAND" (NOT AND) gate.

The next transistor across inverts the output, so its collector goes high when both the first bases are driven, so the output at that point is AND.

The two on the right form an OR (or rather NOR) gate, but that is only enabled when the AND gate output is low.

Either input alone activates the OR stage; but both together disable it, so the overall function is XNOR, Exclusive NOR.

 

[Buk]

So in my view the second transistor from the left, can not be turned on,

Try playing with the buttons here to understand how and where the current flows.

 

[Pommie]

We don't even know the pinout of the transistors which is why we need a full schematic - not guessing from a picture.

Mike.

 

[Buk]

We don't even know the pinout of the transistors

The video explains the pinout.

 

[Pommie]

The video explains the pinout.

I didn't know of and can't find a video.

Mike.

 

[Buk]

I didn't know of and can't find a video.

He mentioned the name in post #13, but unfortunately, he was shouting at the time, so nobody noticed.

 

[sxy]

buk thank you

 

[unclejed613]

We don't even know the pinout of the transistors

looks to me like EBC in the picture of the breadboard in post#1... the switches just pull up the bases through 1k resistors to Vcc.