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

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Using Compact Flash card as RAM for CPU without ICs

I'm planning to build a basic CPU without using any ICs. As building a large memory flip flop array would be infeasible (and I don't want to use something like a SRAM IC) I had the idea of using a ...
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1answer
47 views

14 x 14 LED Matrix - How can I control it?

I intend to build a 14 x 14 standard 3mm blue LED matrix, for a WordClock-like project, but I have no idea how to control it. I've heard of multiplexing with NPN transistors, but I'm concerned about ...
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2answers
38 views

Understanding slow response of multiplexed thermocouples

I have a simple circuit swapping eight thermocouples through a MAX31855 analog-temperature-to-digital converter with two CD74HC4067 multiplexers. The MAX31855 is wired to the SPI pins on a raspberry ...
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0answers
20 views

Arduino + 4051 -> noise on certain 4051 pins

I am trying to use two 4051 ICs with an Arduino Micro right now. The idea was to have an 16-sensor demo station (8 sensors per ...
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0answers
27 views

RFID antennae at distances of 2 cm

I want to arrange RFID antennae spaced equally at distances of 2 cm. And I'll be connecting those using a MUX. The other end of the MUX is connected to a reader. How should I go about designing that? ...
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1answer
52 views

How to transmit data from an analog multiplexer to an RS232 COM port on a PC

I am having trouble understanding how to design a circuit that will transmit multiple analog data signals to a computer through one RS232 COM port. The analog data is a simple voltage reading from ...
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4answers
170 views

6 Buttons, 2 Wires, 1 Microcontroller

First off I should probably mention that I'm a beginner when it comes to electronics. I am planning on adding some buttons to a controller but have limited space for wires. Only 2 of the wires I have ...
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2answers
31 views

Appropriate Brightness for LED Displays

This may be a question strongly depending on application and opinion, but I'll give it a try. I am designing some controls for an industrial application, including cap touch buttons and LED 7-segment ...
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52 views

4 to 1 multiplexer using BC549 transistor

I would like to know how to make a 4 to 1 multiplexer using BC549 transistors also the it has a function wherein I can select which input or output to send HIGH or LOW just like the 4051 multiplexer.
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2answers
52 views

Keep brightness high whilst multiplexing [SOLVED]

I have searched a little but I'm a noob to electronics so it was hard for me to understand. So here is my problem. I have made a little 3 x 3 led matrix to test. When powering 1 led it was fine, but ...
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2answers
81 views

Unused select line combination in 3x1 MUX?

While designing a 3:1 mux we require 2 select lines, but one combination is not useful, say 2'b11. If this combination occurs the output becomes 0 irrespective of the value of input lines. Is not the ...
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1answer
35 views

Effects of restricting most significant bits

So i have calculated the settling time for the capacitor C in an RC circuit. The RC circuit is the result of connecting an ADC with a mutiplexer. The ADC is a 12-bit type. In the assignment ...
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1answer
46 views

Shift registers, flip-flop, Multiplexer & Demultiplexer with microcontrollers utility

While i read alot about the popular 74HC595 shift register and its use for multiplexing i can't find anything about the following chips: MC14053B Triple 2−Channel Analog Multiplexer/Demultiplexer ...
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1answer
34 views

Need help to calculate time in an RC circuit with a AD converter and a multiplexer!

I am not sure how to describe this in english, but i will give it a try. I have a unipolar AD converter with Vref=3.3 V and 12 bits. The digital output is d=969 so that gives me the Vin=780.879 mV. ...
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0answers
24 views

How can I implement this circuit using an 8-to-1 multiplexer and S[2:0] = abc control signals?

I understand that on the top MUX I1 is always 1 and I2,I3 are always 0. I know how to construct a MUX if given the boolean function but I can't do the opposite. Any pointers?
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4answers
39 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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2answers
116 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
51 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
65 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
73 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
30 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
22 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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19 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
82 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
70 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
40 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
85 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
71 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
108 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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0answers
68 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
127 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
102 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
40 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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243 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
285 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
112 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
242 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
51 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
90 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
29 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
57 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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0answers
33 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
46 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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76 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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2answers
75 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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0answers
20 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 ...
3
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4answers
106 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 ...
3
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1answer
157 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 ...