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

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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
32 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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76 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 ...
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1answer
59 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 ...
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1answer
53 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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37 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
79 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
29 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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69 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
35 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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86 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
23 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
279 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
97 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
129 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
40 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
57 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
22 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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53 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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25 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
38 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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61 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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62 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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18 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
102 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
147 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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124 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
166 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
54 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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84 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
89 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 ...
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1answer
56 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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16 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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70 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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95 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
44 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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211 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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635 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
471 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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525 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 ...
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96 views

do demultiplexers remember

I'm working on a high school project were i need to make a score board using 420 LEDs controlled by an Arduino. I can see that the 74HC4105 demultiplexer will let us turn three pins into 8, but if we ...
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4answers
124 views

Easiest way to read a large bank of LED's

I have a pretty straight forward question but every answer I come up with seems over complicated or just plain wrong. I'm designing a data logger/fault detection system to be used for a large piece ...
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3answers
68 views

Is a multiplexed signal same as a composite signal?

Used to StackOverflow, this is my first question here. So please bear with me if the question is too simple and obvious to you as I am not good in Electrical Engineering stuff. I really need to ...
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2answers
93 views

Laser Multiplexing

I'm new to ECE stuff, but I was wondering what kind of equipment I'd need to have an 8x8 or more grid of lasers being controlled with specific on/off patterns. I'd want 5mW lasers in an 8x8 grid. It ...
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2answers
261 views

How to measure trace impedance?

I have seen that trace impedances in PCB's are maintained 50 ohm & so on. How to measure this impedance using a simple multimeter?
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1answer
114 views

Looking for a way to output 100-144 Analog Channels from Arduino

I've been searching for days and found 2 ways that could work, but not sure about implementation: Using shift registers like in: ...
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4answers
278 views

How to implement 8-bit 2:1 multiplexers on a PCB?

I need to implement a 2:1 multiplexer for 8-bit data. That is: as inputs it should take two 8-bit numbers and a Select line; and as output an 8-bit number. I could use two 74HC(T)157s (this is a quad ...
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78 views

Mutually exclusive headphone and speaker

I have a device that has only one set of analog audio out signals that are amplified for headphone usage. I want to be able to use these signals to output to a set of speakers OR a headphone jack, but ...
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1answer
186 views

A circuit having 2 inputs and 2 outputs

I am going to design a circuit that should have 2 inputs and 2 outputs. when both inputs are low both outputs should be low when input 1 is high and input 2 is low, output 1 should be a square wave ...
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3answers
249 views

How to switch between two input lines based on a digital pulse

How can I switch between two inputs based on a digital signal. I would like to have the Input 1 connected to the Output for the duration of the pulse and Input 2 connected to Output when the signal ...