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

learn more… | top users | synonyms (1)

0
votes
0answers
6 views

Alternatives to the V35 interface [migrated]

I am trying to find an alternative for the legacy cables I am using. I currently have a Cisco router connected to a DL 600 E (Multiplexer). On the Cisco router there is a serial port. On the ...
3
votes
1answer
91 views

Display Double Digit Numbers on 2 seven segment displays

I'm making an Arithmetic Logic Unit(ALU) for an assignment and I'm on a point. So according to my circuit design on the link shared below, I am able to output 1 digit of my alu. It is a 4 bit ALU so ...
0
votes
1answer
42 views

Correct 2 to 1 Multiplexer Truth Table

What is the correct way to write a 2 to 1 multiplexer truth table? In a couple of tutorials I've come across (1,2), the table is presented as follows: However, the same tutorials show the 4 to 1 ...
0
votes
1answer
34 views

Switch TENS unit between many channels

I would like to switch the output of a tens unit (one of those things that uses electricity for pain relief) to 8+ different outputs. I want to create an electro tactile device. The idea is to switch ...
0
votes
1answer
42 views

NPN or PNP for multiplex seven segment display?

I want to put three multiplexed seven segment displays on a pcb module which then will be connected to another board through a 1x12 Pin header housing an ATMega (so assume in the following that Pin 11 ...
0
votes
1answer
44 views

Interface 10 image sensors to Linux CPU

I need to process image data from 10 image sensors simultaneously (namely from OnSemi MT9V022s or similar). All 10 sensors will be externally triggered by a common signal. Ideal solution would be to ...
0
votes
1answer
52 views

MOSFET ORing behaving differently with fast slew rate on one of the Input rails

I am giving more details about the problem . pls read patiently. we are using p-MOSFET's ORing to do automatic switchover b/w @ 12V_External (comes from PCIE edge) and emergency battery. The circuit ...
1
vote
2answers
92 views

Is it possible to read a 10 by 10 switch matrix with 8 by 8 I/O pins?

I was asked this question on an interview: given 8 output pins and 8 input pins on a microcontroller, is it possible to read a 10 by 10 switch matrix without using multiplexor and demultiplexor chips? ...
2
votes
1answer
88 views

Assign I²C address to multiple devices on the same bus

I've got a couple of ADCs on the same I²C bus, which all default to the same address. My first instinct tells me to use an I²C multiplexer like the TCA9544A but that would require sending a byte to ...
0
votes
0answers
31 views

Constructing 16-1 Multiplexer from four 4-1 Multiplexers and a 2-4 Decoder

I have to show how to construct 16-1 Multiplexer from four 4-1 Multiplexers and a 2-4 Decoder. I tried creating 8-1 MUX from two 4-1 MUXes (using enable pin), but have no clue how to stack more MUXes ...
0
votes
0answers
37 views

Ideal multiplexers

I need thorough tests on different voltage biasing of an analog design. I figure all I just need to generate all combination of conditions (mostly voltage levels, some frequency) and port ...
0
votes
4answers
66 views

How does the OR gate work?

I'm asking this in reference to multiplexers where there are multiple inputs to the final OR gate. Say I have two different signals to an OR gate. One is at 4V and the other at 5V. So if I'm letting ...
2
votes
2answers
73 views

Did I hook up this CD4052 Analog Multiplexer correctly?

Upon reading the data sheet this chip seems straight forward, but I'm having the hardest time hooking up the CD4052. The chip I'm using is actually a, "CD4052BE". Here is a link to the datasheet. I ...
0
votes
3answers
67 views

Multiplexing 2 times 4 CC RGB LED's

I need to make 2 sets of 4 Common Cathode RGB LEDS. In each set of 4, every led must be individually addressable. It doesn't matter if both sets have duplicate outputs or not. (Although optimally they ...
0
votes
2answers
103 views

analog multiplexer CD4051BE

I want to test the analog inputs of a CD4051BE multiplexer, so I created four voltage dividers in order to measure four different values of analog input. I connected them to the I/O0 - I/O3 ports of ...
0
votes
2answers
34 views

2-to-1 Multiplexer logic equation: is order of inputs important?

The boolean logic equation for a 2-to-1 multiplexer is \$(A.\bar{S})+(B.S)\$, where \$A\$ is the first input and \$B\$ is the second input. Is this logic equation equivalent to \$(A.S)+(B.\bar{S})\$, ...
0
votes
1answer
32 views

OFDM with CSMA/CA

Most Wifi standards (e.g. 802.11a) use OFDM for orthogonal frequency multiplexing, i.e. assigning different subcarriers/frequencies to different users. On the other hand, it says CSMA/CA is used to ...
3
votes
1answer
57 views

Switching Serial Connections among several devices?

I have 3 devices that communicate via a serial port. Let's call them Device 1, Device 2, and Bluetooth (BT to serial adapter). The BT is used to communicate with a computer, but it can be treated just ...
0
votes
1answer
50 views

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) ...
-1
votes
1answer
55 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 ...
0
votes
0answers
108 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 ...
0
votes
2answers
72 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 ...
1
vote
1answer
73 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 ...
0
votes
3answers
49 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 ...
0
votes
1answer
24 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 ...
1
vote
2answers
47 views

easy way to switch a signal

I have below configuration: ...
0
votes
0answers
56 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, ...
0
votes
1answer
38 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 ...
0
votes
0answers
34 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 ...
1
vote
2answers
120 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 ...
1
vote
4answers
88 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, ...
1
vote
1answer
66 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 ...
0
votes
2answers
62 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 ...
1
vote
1answer
49 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 ...
0
votes
2answers
84 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 ...
0
votes
2answers
34 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 ...
0
votes
3answers
142 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 = ...
0
votes
2answers
28 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? ...
0
votes
2answers
75 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 ...
0
votes
0answers
47 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 ...
0
votes
2answers
75 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 ...
1
vote
2answers
113 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 ...
2
votes
1answer
93 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 ...
0
votes
1answer
76 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 ...
1
vote
0answers
63 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 ...
0
votes
1answer
84 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 ...
0
votes
1answer
59 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 ...
0
votes
1answer
54 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 ...
1
vote
1answer
107 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 ...
1
vote
1answer
67 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 ...