A multiplexer selects one of two (or more) inputs based on a control input. It then outputs the selected input.

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Implement Multiplexer [on hold]

How can I design the following MUX from the circuit in the image?
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4answers
33 views

Can I use a line multiplexer as a level shifter as well?

I have 40 x 5V inputs that I want to read using 3V GPIO pins on the beaglebone black. I am planning on using 5 multiplexers (such as the 74HC151 or 74HC251) that will be sharing the 3 select lines. ...
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1answer
16 views

How Channelization code is shared in HSDPA?

I am on my way to understand the HSDPA/HSUPA technologies. I have just started and came upon the topic of channelization code. I learned how these codes are generated - Hadamard code technique - and ...
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2answers
42 views

How to use a MUX DEMUX to communicate two circuits?

I'm trying to reduce two circuits with 14 connections to only 3. I was googling for hours and I read a lot about multiplexor and demultiplexor. But as is my first investigation in electronics (I'm a ...
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1answer
63 views

Reading and processing 32+ ADC channels at high frequencies

For a project I need to sample 32 or more photoresistors at a time and return an ID and value of the brightest photoresistor over some communication (i2c, serial, etc doesn't really matter to me). I ...
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1answer
62 views

why there is no quad 1-to-4 demultiplexer?

I have 4 input signals to route on 4x4 outputs. it's not a 1-to-16 demux what i'm looking for. Outputs must be selected 4 by 4. is there any demultiplexer that can do that on one IC ? I didn't find ...
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1answer
29 views

Would an analog mux be able to output various voltages?

So from my understanding, an analog mux such as CD74HC4067E will be able to output diferent voltages based on its inputs. Thus for an example if I connect 4V, 3.3V, 2.2V and 0V to a 4:1 mux with 00, ...
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1answer
20 views

What happens to the output (S) in an NTE74C4067 multiplexor if multiple channels are active?

I found the data sheet for this multiplexer/demultiplexer, and as I understand it, when channel 5, for example, is active (I5), S0 and S2 would be active, making the S nibble 0101. The question is, ...
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16 views

How to simulate metastability for a negative latch

While it has been discussed how to simulate the metastability for a DFF. I was wondering if the procedure can be used to observe the metastability if I use a multiplexer as a latch i.e. by connecting ...
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1answer
77 views

Reading 16 voltages accurately with three decimals on Arduino

I need to monitor 16 LiFePO4 cells. Their Voltage during operation measures from 3.0 to 3.7V which I would like to measure accurately with 3 decimals. I was thinking of using a 16 port multiplexer ...
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2answers
65 views

Is this a 4:2 Multiplexor?

My instructor has been insisting that the multiplexor in the picture above is a 4:2 mux not a 4:1 mux and that my textbook (Digital Design and Computer Architecture by Harris) is incorrect and that ...
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1answer
37 views

Analog Multiplexer

In what ways can an analog multiplexer i.c fail? I want to use this in our system ,so i need the complete details of it,so that even if the mux fails,the output should connect to one of the input ...
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1answer
81 views

what is an analog multiplexer? Do we have a 2:1 analog mux?

I have two analog signals with frequencies upto 8kHz contained in it.I need to select one of the signals using a digital logic select.How can I do this.I need the most reliable i.c as our system ...
3
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1answer
69 views

Understanding scrolling display circuit

I have this outline of a circuit designed to display a scrolling message. I'm having some trouble understanding how it's supposed to work, so I'm just going to explain what I think I know and go ...
0
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1answer
95 views

Implementing a 8X1 multiplexer using two 4X1 multiplexer

"Obtain an 8 X 1 multiplexer with a dual 4-line to 1-line multiplexers having separate enable inputs but common selection lines. Use a block diagram construction." This is a question i came across ...
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53 views

Making 2x4 decoder by using 1x4 demux

As far as I know, 2x4 decoder has 2 control signals and 4 outputs. 1x4 demux has 1 input, 2 control signals and 4 outputs. And again As far as I see, Just difference is 1x4 demux has a 1 input. So, If ...
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4answers
102 views

4 digit 7 segment CC - all digits count the same number

Ultimately I'm looking to build something that's going to count revolutions as part of a guitar pick up winder. I've got a circuit hooked up with 4 x 4026 counters going into a 4 digit 7 segment ...
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3answers
31 views

Is there any difference between using a decoder for the alu op code vs using a multiplexer?

I am a programming student studying electrical engineering fundamentals on the side. I have come across two different methods for getting the result of an operation onto the bus. A decoder accepts ...
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3answers
96 views

When multiplexing audio do I need a pre-amplifier for each channel?

I am building a 16 channel multiplexer which will deliver the input from 16 microphones to a single ADC. I am clocking the ADC at 1.6 MHz and therefore sampling each audio channel at 100 kHz. The ADC ...
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1answer
39 views

Simple Mux Equation finding, need help?

How we can find the equation of following simple diagram ? My TA solved it as : C.Not(B).A + B.Not(A)
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159 views

Verilog for 4 bit wide 2:1 Parameterized MUX (output needs to be decoded to 7 segment display)

I'm working on a project, which I can't seem to figure out. It has to be a parameterized 2:1 MUX, and we're to assume that the inputs are BCD (0-9). The output needs to be displayed on the 7 segment ...
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1answer
24 views

How to properly check/evaluate Multiplexer design implementation?

I am not electrical engineer at all. I am just participating in this course. I have been struggling for 2 days to implement Mux8Way16 - a multiplexer which has 8 different 16-bit inputs. How can I ...
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2answers
283 views

What are the “No Connect” terminals on this multiplexer and what purpose do they serve?

I was looking through the datasheet for the ADG506A/ADG507A and on the chip there are these terminal marked as NC and underneath the image it says "NC = NO CONNECT". They are also not explained in the ...
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3answers
106 views

Logical Design Operation, A Simple Questions?

I'm so sorry if I ask my first question that so simple. My filed is Math and Computer science. I self-study Digital Design. My challenge is how we can find the operation of the two following ...
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1answer
204 views

making 16x1 multiplexer by using two 8x1 multiplexer and one 2x1

How can I create 16x1 multiplexer by using two 8x1 multiplexer and one 2x1 multiplexer? If it is possible, could you show on image(draw) ? I've drawn is it right ?
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1answer
46 views

boolean expression to NOR gate (MUX)

I have a 2:1 MUX. It would be designed by using NOR gates. Inputs are X and Y. S, which is data select. When S is 0 F=X , S is 1 F=Y. Until here, okey. I've found $$ F = S'X + SY $$ to make NOR, ...
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2answers
84 views

Implement a 2x1 MUX using 1x2 decoder

I need to implement a 2x1 MUX using a 1x2 decoder(We may also use 2 AND gates and 1 OR gate). I've made a start, but I'm kind of stuck. I thought, hey, I've taken a function table and implemented it ...
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1answer
28 views

ADG608 multiplexer acting really strange in Multisim

I am trying to use the circuit below to switch between multiple resistors using a multiplexer. Initially I had different values of resistors attached to every channel, but since I was getting very ...
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0answers
55 views

Reverse Shift Register?

I'm super new to electronics and am wondering if there is anything that behaves like the reverse of a shift register... as in parallel in and serial out instead of serial in and parallel out. I know ...
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31 views

Implementing sum of minterm to mux

I am trying to figure out how to do the following but I literally have no idea how to start something like this. It gives me a 2x2 kmap and says I CAN use it but its not required. It also says that ...
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1answer
41 views

Multiplexer Timing

I have a 4 to 1 mux that receives its data inputs and select inputs from edge clocked shift registers . Also the output of the mux goes to another shift register(call it the output register) as well. ...
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68 views

Do we ever need to use multimeter's transistor current gain measurement feature?

Many cheap multimeter have this feature that they can measure the hfe of a NPN or PNP transistor. Does anyone ever need to use it? I mean, when we design something using discrete transistors, we look ...
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71 views

What is the function of multiplexer boolean expression?

Here is the image of multiplexer: May I know, what is the output form of Boolean expression, how it is working function? Can anyone help me to guide me? Any help would be highly appreciated,
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19 views

Relation Between 8:1 Mux Signal , Mux Accessing Time & output of Mux

I have asked a question yesterday . Now i have a strange issue. I am working with Beaglebone white in Android platform . I have one external ADC (ADC121C021CIMM - connected through 8:1 Multiplexer ...
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4answers
104 views

Why would anyone use an inductor on a mux?

I read a schematic where it has a Z80 CPU tied to a 78LS138. The CPU's WR line is tied to ...
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1answer
153 views

Relation between ADC register value & ADC accessing time?

I don't have any Electronics background.I am Software Engineer. I want to know that is there any relation between accessing the ADC buffers with a time (T ) & the ADC buffer values. I am working ...
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3answers
137 views

Is there a Multiplex with X inputs to control X outputs?

I want to use a multiplex to controll my circuit. I just want something that can be a switch between an input and output. I thought to create this circuit: simulate this circuit – ...
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2answers
207 views

Can we send multiple signals in same core at the same time in the fiber optics? If yes, how?

I am curious to know how exactly does the fiber optics works. I understand the basic concepts of the fiber optics communications but am curious to know if there is a way to send multiple signals in ...
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1answer
57 views

Level translation and multiplexer

I have one logic 3v3-input (5v non tolerant) on my microcontroler and I want to interface 4 5v-inputs. So my idea was to connect a multiplexer supplied in 3v3 but I have seen in datasheet (for ...
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131 views

Implement a Boolean function using an 8x1 deMUX

Using a 1x8 deMUX with an AND gate, create F(x,y,z) where F has minterms at 1,3 and 5 This is the solution I came up with: I'm pretty sure this solution works, but it doesn't quite fit the ...
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1answer
107 views

Multiplexing analog signal

I want to read 4 analog signals (coming from 4 pH sensor, generally said 16HZ freq.) With one buffer op-amp circuit going into a single ADC channel. Is it possible to achieve this using analog MUX ...
3
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1answer
61 views

How to deal with analog pin drivers with output switching?

I'm trying to figure out if there's any way to affordably improve the performance of an analog pin driver that needs to be periodically isolated from its load, for the duration of self-calibration. ...
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0answers
20 views

Individual Control of 4 DC Motors with 1 Motor Driver

I am trying to control 4 DC Motors with a position feedback signal, with access to only one of manufacturer's motor control driver boards. Since I don't need simultaneous control over all of them, I ...
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1answer
100 views

Current sourcing octal buffer/line-driver for 7+1 segment LED multiplexing?

I would like to multiplex 8, 7-segment LED displays with two, 8-bit shift-registers. The required current for one segment is 20mA. I have no desire to overdrive the ...
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0answers
98 views

Discrete logic multiplexer

I posted a more in-depth outline of what I'm doing here, but basically I'm building this circuit (for n=3): The circuit displays an output based on the combination of three three-input DIP ...
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1answer
46 views

I'm getting a noisey/square wave output for my mux/demux?

I am using a "CD74HC4051 High-speed cmos logic analog multiplexer/demultiplexer" I put 5V to VCC, put my oscilloscope probe to the common out/in, put 3.3V to A1 (channel in/out), and have a wire ...
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1answer
281 views

How could I go about building a 2-bit comparator that compares two 2-bit numbers and determines whether one is greater than or equal to the other?

Using an 8:1 multiplexer, I understand there are three inputs, so I'm not sure how I'd go about getting two 2-bit numbers, which would be four variables, not three. Any pointers on how to get started ...
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4answers
696 views

Multiplexing a Circuit

Frankly, I'm overwhelmed with this circuit that I have to start building in lab tomorrow. Last week we built an octal decoder that takes a 3-bit binary input from 000 to 111 and displays a unique ...
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1answer
697 views

Design a full adder of two 1-bit numbers using multiplexers 4/1

How can i implement the full adder of two 1-bit numbers using only multiplexers 4/1? I created a truth table for a one-bit full adder, which looks like this: A = first bit B = second bit Pu = bit ...
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2answers
668 views

Using Arduino Mega With lots of strain gauges

I was looking for a strain gauge shield for an Arduino Mega. I found this link which I found really useful: http://www.osengr.org/Projects/Load-Cell-Shield/Load-Cell-Shield.html At the bottom of the ...