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

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Multi-channel high frequency signal acquisition

I have to design a test bench for a device that has more than 1000 outputs. The voltage of these outputs will be about 10mV peak-to-peak, the frequency will be in the range of 100MHz (for the carrier) ...
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40 views

Is it possible to multiplex the same frequency (without bandwidth division)?

I have a range of bandwidth (e.g. [865,868] MHz) and more than one RFID tag I'd like to receive information from, over that range. How could I multiplex those ...
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84 views

7-1 Multiplexer Inputs

I'm a computer science student taking a required Computer Organization course so I'm very new to this electrical engineering stuff. I want to know how does one construct a 7-1 multiplexer? I know the ...
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61 views

multiplexing control signal on speaker cable

I need to put an alarm siren close to the location of one of my audio speakers. But I don't have a dedicated cable towards this siren. Because the alarm control unit is close to my speaker amplifier I ...
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36 views

TCA9548A I2C Multiplexer - 10k resistors on the address lines

I'm looking over the schematics and PCB layout of the Adafruit TCA9548A I2C Multiplexer breakout board. I've attached the schematic below. I cannot figure out why there are 10k resistors on the ...
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44 views

Multiplexer with 5v select and 9v or more routing

I need to route a 9v signal using a 5v or 3.3v microcontroller. Does anybody know of a multiplexer that supports this, or a circuit it could put in between the microcontroller and the multiplexer to ...
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18 views

Implementing a function using a mux and no gates at all

Given the function \$f(w,x,y,z)=x'y'z'+w'xy' \$, where \$ '\$ means negation. I was given this function from a mux \$2^3*3\$ - 8 inputs and 3 control lines. In the original implementation \$y'\$ was ...
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47 views

easy way to switch a signal

I have below configuration: ...
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39 views

74HC4051 Analog multiplexer settling time

I have simple schematic for multiplexing single ADC input to multiple analog inputs, made from LMV934 buffer and 74HC4051 analog multiplexer. The problem is, after selecting desired analog input, ...
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21 views

3 variable Kmap into 2-1 Mux

I am trying to figure out if I implemented a 2-1 Mux correctly based on a 3 variable K-map. my function states F(x,y,z)= Σm(0,1,3,6), and I have created a kmap as follows ...
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21 views

tradeoff of implementing MUX with some tristate buffers rather than AND OR logic?

Does anyone know the tradeoff of implementing MUX with some tristate buffers rather than AND OR logic? I know that one of the advantages of using tristate buffer is that it is easier to distribute ...
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60 views

What is the minimum size of multiplexer needed to implement any boolean function of n variables if we are given a multiplexer and an inverter to use?

The following is the solution given. We can use n-1 selection lines , and using 0,1 and nth variable and its compliment to realize the function So ans is 2^(n-1):1 I'm unable to understand how ...
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72 views

Does an ALU always do add and sub, but only returns one of the results?

Pretty simple question. Does an ALU internally always do multiple operations like add, sub, div, mul, ... and you simply have to specify which result you want to return? I was told that it does that, ...
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18 views

Ways to improve saturation time in Multiplexers

I'm using max4708 multiplexer (operated as single supply 36V), when i tested the multiplexer- my inputs, for example +32V, +20V get well saturated at 20Khz.Later when i added to the circuit, for the ...
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1answer
40 views

Is NXP's PCA9548A compatible with TI's TCA9548A?

I am using TI's TCA9548A in my Projects, but I would like to know if I can substitute it with PCA9548A from NXP. By comparing the datasheets this seems to be indeed the case, but I am wondering why ...
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25 views

Programmable gain instrumentation amplifier with R-2R ladder and analog multiplexer

I want to build a programmable gain instrumentation amplifier with power of two possible gains (1x, 2x, 4x, 8x...). Is there a way to use a R-2R resistor ladder and an analog multiplexer in order to ...
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35 views

OrCad issue: Logic circuit simulation…ambiguous output

After simulating the following logic circuit(in OrCad),the resulting output -'y' is unclear. It seems to me that everything is fine, yet the result is ambiguous. Can you, please, explain what is the ...
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71 views

Set multiplexer inputs to a logic 1 state

How can I set, in Orcad, all the entries of multiplexer(in the picture) (except: 1, 13), to logic state '1' (for example, I understand that if I place 'ground' to some entry, then it will be ...
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17 views

Lenient MUX and Load Signal

https://www.youtube.com/watch?time_continue=25&v=d3bF2v056WU http://i.imgur.com/ipDYgd8.png I'm going to ask about some names. You could say "they are just names" but if I get some context for ...
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59 views

Why is the output (in the truth table) inverted in a ic 74154 used as a demux?

I am studying Digital Principles and Applications from Malvino and Leach. I have a doubt in the demultiplexer section. This is the image of a 1 to 16 demux. I understand how it works. So, if ABCD = ...
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22 views

MUX Notation A vs B vs Cin vs S notation

Original video: https://www.youtube.com/watch?time_continue=76&v=AS17X2rcRKM http://i.stack.imgur.com/cByOK.png If A, B, and C_in are all select inputs, then why is C_in labeled differently? ...
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57 views

Nested I2C multiplexers

I want to provide 12 actuators from a microcontroller (Particle Core) over I2C. The problem is that the drivers for the actuators have all the same I2C addresses. So I'am considering to use I2C ...
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39 views

Unable to determine why clock signal is being pulled down

I have a clock signal coming out of an SPI source. This source has an output resistance of 400 ohms at 8MHz which was measured and output voltage of 1.9V peak-to-peak. The clock signal travels to a ...
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50 views

How to calculate input resistance of a multiplxer

I am trying to measure the input resistance of the following multiplexer: Multiplexer The reason I am measuring the input resistance of this multiplexer is that I have a signal coming out of my ...
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84 views

Is there something like a Single Pole Quad Throw Relay?

I want to be able to route an analog signal through at least 4 different points. Now I know that I can't use analog multiplexers since the signal (high power) I want isn't within the range they can ...
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84 views

Multiplexing thermocouples, what to look for in multiplexers?

I would like to use a MAX31855K IC for amplifying K type thermocouple response. This alone seems rather straightforward, but I'm also considering connecting 2 or 3 thermocouples to one IC. I don't ...
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58 views

Connecting Multiple Sensors

I have 4 pairs of "LED + LDR" sensor. I need to be able to switch each of them on/off independently and take reading from the LDRs. To connect all of them to the microcontroller board, I would need 4 ...
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61 views

Reduce routing avoiding multiplexer

I'm implementing a systolic array for a project, every Processing Element (PE) contains many multiplexers in cascade due to absolute value subtraction and conditional operator, the code looks like ...
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73 views

How to read large number of analog-in fast and effectively with Arduino-Compatible Hardware

I need to read the analog values of up to 50 analog light reflection sensors which are used to determine distance to a specific object with an Arduino-compatible Microcontroller such as: Arduino Due ...
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37 views

Verilog: Using a counter module to switch outputs

So I'm pretty new to Verilog and am working on a 3 bit multiplier project that outputs the decimal solution of the multiplier to the 7 segment display on my fpga board. I'm having a problem with ...
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45 views

Differential POE 1000base-t signaling through analog multiplexer

I want to make a test device which can route network inputs to one output. For example it could sit between two computers and a network switch. The TS3L301 looks promising, but I am unclear about the ...
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77 views

using a multiplexer for a high dynamic range current sensing

I am working on a project in which I am supposed to do current measurements for a sensor node. the range of the current varies from 0-30 mA the sensor node has two modes: 1. active mode (maximum ...
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51 views

Mealy FSM using T flip flops

So I am to design a mealy state machine which detects the sequence 101. The state diagram was given, and from there I obtained the flip-flop excitation equations. I am supposed to use 2-1 multiplexers ...
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43 views

The percentage of utilization for the single level mux implementation

Is the percentage of utilization equal to 100% here? If so, can I calculate the utilization like this? $$\frac 4 4 \cdot 100 = 100%$$ Also, I have to sketch a 2-level MUX implementation based on ...
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60 views

Difference between an Analogue multiplexer vs ADC chip with lots of channels

Advantages and Disadvantages of Analogue Multiplexer vs a ADC chip. For having more analogue inputs on micro-controller. Thx
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3answers
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Measuring multiple analogue signals on 1 analogue Input?

Is it possible to detect multiple analogue signals from different analogue sources onto 1 analogue input pin on a micro controller. Another way of asking this question is that we can detect multiple ...
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1answer
34 views

I have a quick question on 2-1 multiplexers

So say we have a 2-1 MUX with \$D_0=GND\$, \$D_1=Q_0\$ and S=X. Questions: The output equation will be \$Q_0X\$, correct? Now if we change \$D_0\$ to Vdd instead of GND, what happens? If X=1 ...
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62 views

Routing audio signal with CMOS Analog Multiplexer

I am quite new to electronics but I'm planning to build a device for routing analog audio inputs (cinch) to one output. I want to select one input channel (using a raspberry pi) to forward to the ...
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1answer
96 views

Help building Digital Logic Circuit (from truth table and state diagram)

I am somewhat stuck and desperately need help. I am faced with the Traffic Light Problem, and I completely understand the actual logic of it. However, I am having great difficulty turning this into ...
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2answers
108 views

ADC Multiplexer

I am working with a microcontroller with 8-channel, 10 bit multiplexer A/D converter. In the manual it says: When a sequence consists of multiple samples, the samples may be taken from one channel ...
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1answer
191 views

74HC4051 multiplexing and voltage divider

I need a voltage source for an Arduino analogue input. I'm making a capacitive sensor with an NPN BC548B transistor. In the emitter, I connect the GND, in the collector, I connect the analog port of ...
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1answer
54 views

How does Frequency-division multiplexing deals with overlaps?

As I understand it, FDM uses separate frequency for each channel, thus A will transmit data, for instance, every two seconds and B every three seconds. But, what will be delivered on the wire in the ...
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48 views

Implementing MUX for different serial input and output

I want to make a MUX using a uC for my serial input and outputs. Below you can see the system setup. There are two parts (1 & 2) in the setup, I am doing the part 2 which is 4000 meters far ...
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1k views

How to connect 16x2 lcd to esp8266?

I have ESP8266-01 this model I Updated the frimware to nodeMCU and uploaded the web server code and tested by blinking led via web browser. Now I want to test that if I can send text data from web ...
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2answers
81 views

How do I multiplex 6 x 4 bit ALU outputs?

I have an ALU that performs 6 functions, each function provides a 4 bit result. I want to multiplex these outputs so they can be selected with an op-code (selector bits of the mux). The only problem ...
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590 views

Reading hundreds of inputs with a single atmega32

I have 128 inputs (push buttons) in a single row in a project and I want to read them using a single atmega32. Of course there is not enough pins in an atmega 32 for this purpose and I know the ...
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FDM on a multi-subscriber line for which each subscriber has a filter - real world examples

I recently asked what was, in retrospect, a rather poor question: How does electrical interface on multi-subscriber FDM telephone line work? In the question, I make a bad assumption about how ...
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65 views

How do modern LCD screens multiplex?

I know how a standard LCD screen in a calculator is multiplexed (Shared rows and columns), but I've recently seen a highspeed recording of a modern LCD Display (PC Monitor) and it didn't flicker at ...
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44 views

How does T2 shifter work?

I would like to implement in VHDL a similar T2 shifter: In a book I read that the behavior of T2 shifter is based mainly in 3 stages: Let's suppose we have as inputs: R1 (64 bits, value to shift), R2 ...
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86 views

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 ...