can anyone explain about multiplexer circuits. I known no of inputs, select line. but how that select line goes into the AND gate and combine?

 

I 'm not sure what it is you don't understand.

Maybe check here for an example schematic:
http://en.wikipedia.org/wiki/Multiplexer#Digital_multiplexers

 

There are many different types of multiplexers. First it is important to know how a 2 input multiplexor works. I am guessing

you do, but I will describe it briefly just in case. In a 2 input multiplexor, you have 2 inputs x0 and x1 and then a chooser bit

c. If c=0 x0 comes out of the multiplexor, otherwise if c=1, x1 comes out.

This operation is simply ANDing of inputs with select lines.

 

can u have circuit of that multiplexer? i don't understand what u r saying.

 

Input C is the addressing input /chooser bit , which controls which of the two data inputs, X0 or X1, will be transmitted to the output.

So .. If C=0 then X0 comes out of the multiplexor, otherwise if C=1, X1 comes out.

 

Input C is the addressing input /chooser bit , which controls which of the two data inputs, X0 or X1, will be transmitted to the output.

So .. If C=0 then X0 comes out of the multiplexor, otherwise if C=1, X1 comes out.

That's for a digital multiplexer. An analog multiplexer that can transmit analog signals (as well as digital) is built with
CMOS transmission gates to route the signal.

 

k as u said if c=0 then x0 comes as output i understand but my question is that how i can decide whether x1 take 0 or x0 take 1 means gate with x0 takes input from the c is 0 or 1? same as gate with x1 takes input from the c is 0 or 1?