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Questions tagged [multiplexer]

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

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With multiplexed displays, what is the correct term for a single “frame”?

Let's take a look at the following animation demonstrating time division multiplexing. Source As you can see and probably know, the image is shown by displaying one line after another in rapid ...
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How to detect multiple digital sensor with one micro controller input?

I would like to connect multiple TSSP4038 sensors together in such a way that I only have one output (let's call it Y_out), if any of the sensors output is HIGH then Y_out is also HIGH (regardless if ...
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Latency of Components

Latency comparison between the addition of dependent modules vs independent modules? For example, a 32-bit adder made up of thirty-two 1-bit adders. Each 1-bit adder calculation depends on the ...
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921 views

Implementing 3 variable boolean function od 2-1 multiplexers

Recently i've been given a task from my lecturer to implement \$f=\sum(1, 3, 4, 5, 7)\$ on "2-bit multiplexers". That's it. I assume he meant 2:1 MUX. I've came up with following k-map... +------+--...
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How to select line to a 1:4 demux in verliog from a NIOS II softprocessor

I am new to verilog. I'm using this 1:4 demux as described on this webpage (code supplied). 1:4 Demux verilog code My question is in relation to the select line. I have a soft processor NIOS II on ...
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1answer
27 views

Bus Exchange From first Rising Edge

I would like to create a circuit that takes in two pulse trains that exchanges output lines depending on which pulse comes first. Currently I am using an ON 7WB383 and switching the signal manually by ...
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Analogue multiplexer using JFET for small signals

I'm working on a circuit with a non-inverting amp and I would like to switch between two reference voltages, both with low output impedance. So in effect i want something like this: simulate this ...
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5answers
581 views

“Multiplexing” thermocouples to an IO board

I'm trying to solve a problem on a project for one of my customer, 'cause we are having hard times to find an appropriate solution. He needs something really simple (more on this later) and as we are ...
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1answer
37 views

Multiplexing a set of signals

I want to multiplex 8 input lines but have 2 output lines. I'll have two select lines, based on which, the output lines will carry 1st-and-2nd or 3th-and-4th or 5th-and-6th or 7th-and-8th input lines. ...
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1answer
72 views

fpga multiplexor - select line controlled by a soft processor

I have 5 pins coming into an FPGA (inputs). I have two different sets of 5 output pins. I want to select which set of output pins that I connect the input pins to. What kind of multiplexer is this ...
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166 views

7-seg. Display Multiplexing Disturbing Real-Time Clock

One of my colleagues is designing a digital clock with 7-seg displays. The clock function is shouldered by a Real-Time Clock IC, PCF8563. The RTC IC is clocked with a 32.768kHz crystal and its ...
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prioritized power path controller for battery backup [duplicate]

I'm searching for a simple solution for a prioritized power path controller to maintain a system supply line through a rechargable battery when the main supply fails. My goal is to make the cheapest ...
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782 views

Interfacing large number of UARTs to PC

I would like to find a good way to interface many UART devices (sensors) to a single PC for data collection and processing. For my use, there may be as many as 100 UART devices each operating at ...
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1answer
81 views

DeMux Output - Large Pulldown Resistor Can't Pull Output Low

I'm using the SN74CB3T3257 as a demux in a circuit I'm working on. The relevant parts of the circuit is approximately this: simulate this circuit – Schematic created using CircuitLab What I ...
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1answer
153 views

multiplexing 256 led with atmega128 not working properly

Original/First version: Second Version: Second Version display, Brightness not the same for all led!! Originally, I have 8 resistors for each 8x8 dot display, then in this newer version, trying to ...
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3answers
248 views

Explain the internals of digital multiplexers

We were taught ayt our school about data selectors or multiplexers as basically a OR gate taking input of some decoder (Binary to Decimal,Bin2Hex,etc.) with an EXTRA INPUT Lines attached to the AND ...
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Multiplexer circuit

I would like to design a circuit to measure the humidity of the soil by connecting sensors to a 16:1 MUX . I have never worked with MUX and i dont know which one to use or where to begin. Can you ...
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Wiring Organ; Electrical Interference?

General Description (A rough block diagram is linked below.) I rewired my organ with digital electronics. I have a microcontroller (Teensy LC) that is used to scan the keys (pressed or not). It ...
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1answer
74 views

multiplexer with floating outputs

I have actually a solution based on a multiplexer (CD4051) which drives 8 outputs, either at 0V or 3.3V (the input is at 3.3V). Each output of the multiplexer drive a NMOS and the goal is to have a ...
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1answer
63 views

Worried about channel ghosting in DAQ system - Need unit gain buffer?

I am working on a redesign of a test box we have at work. There is a transmitter that is sending data to a recording system (in my case the dewetron trendcorder with Trion BNC modules). We previously ...
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2answers
608 views

4x4 Pressure Sensor Grid Pin Saving

I'd like to make a 4x4 pressure ( force resistance) sensor grid to use with an arduino. But 16 sensors sure need a lot of pins. During my research on this topic I stumbled upon a couple of ...
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1answer
141 views

Trying to multiplex voltage reference gives incorrect output

I'm trying to make the voltage reference for an INA214 opamp selectable between GND, 4.5V and 10V. I'm using a CD4051B multiplexer. However, the 10V VREF gets pulled down to 5.84V, and I can't figure ...
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119 views

What notation is this? (Boolean/Logic Function)

I've come across these questions. What notation is being used in the 2nd and 3rd question? Thanks
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Multiplexed CAN Bus

I have a need to mux the CANH/CANL lines from a single MCU controller/transceiver to multiple pins on an existing connector series. The flow I am looking at would be something like: MCU <--> Xcvr ...
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2answers
58 views

Connect one of 16 loads to power (12 V, ~300 mA), decoder IC?

I am wondering if there is an IC that performs the following task. If I didn't know any better, then I would probably build the following circuit from discrete components. simulate this circuit &...
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2:1 multiplexer in verilog on an fpga

I'm new to verilog. I'm trying to implement a 2:1 multiplexer on a FPGA development board (DE1-SOC altera) using built in switches and LEDs. The following are the assignments that I'm using for ...
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967 views

Why do 2-1 muxes forming 4-1 mux have common selector?

Why is s0 common for both 2-1 multiplexers? Shouldn't each one have it's own data selector? Doesn't such setup remove some of possible logical outputs from multiplexers, if s0 value is same for both? ...
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456 views

In a multiplexer, can you direct the input into all the outputs at the same time?

I need to direct a single line into multiple outputs, so I'm using a MUX to direct the input into the desired outputs (one at a time). However if i ever wanted to do a broadcast to all my output lines ...
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1answer
451 views

Multiplexer CD4051B gives strange readings

I'm trying to multiplex an analog input port on an Arduino Uno. Datasheet simulate this circuit – Schematic created using CircuitLab I've connected the input to 5V for testing stability of ...
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1answer
91 views

How do I get my 555's output to cycle through different paths with just one button?

I'm an amateur so this is a basic question. I have a 555 in astable mode producing a frequency which I put through a speaker as a musical note ("musical" is debatable). I can get lots of different ...
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162 views

Pic32MZ - ADC/Multiplexing?

Using PIC32MZ2048EFH144 MCU. Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/60001320D.pdf 12 Bit ADC The board has 8 DMA Channels(Programmable/Dedicated). I am interfacing 10 ...
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How do you find out if a MUX is bidirectional

I've used this MC74VHC157 in a project thinking this would be bidirectional but I'm not sure. How do you find out if any MUX is bidirectional?
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How can 16 buttons be connected with only 8 wires?

Here is the product. I understand the idea: these 16 buttons use a 4x4 matrix. 4 lines for rows, 4 lines for columns, and we have 8 cables. But: How can this work without any multiplexer ? Can this ...
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1answer
480 views

What is quad 8:1 MUX?

In my assignment i'm asked to show a block diagram for quad 8:1 Multiplexer. But i have no idea what the word quad means in this question. Can someone help me?
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Can I use a multiplexer to connect a small capacitor to a 555 timer?

I'm making a circuit including a 555 timer controlled by an RC combination, where R is fixed and C is one of several capacitors (values around a few pF to a few hundred pF). I would like to connect ...
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1answer
3k views

Full adder using 4:1 mux

I know how to create a full adder using a 4:1 mux with A and B as the select lines. However, now I need to create a full adder using B and Cin as the select lines. the CoutMux and SumMux columns ...
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410 views

Decoupling capacitors for Multiplexer?

I am using a Board with a Cortex M0 to sample signals from force sensors. The sensors have a resistance that corresponds to the force applied, so I am using voltage dividers and read the voltage with ...
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1answer
1k views

How to build a 3-bit comparator using a multiplexer?

I need to (in design) create a 3-bit comparator using an 8-bit multiplexer and/or up to four 4-bit multiplexers. There are plenty of examples of how comparators and multiplexers works on the web. ...
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115 views

Number of not gates in multiplexer

I'm reading a page on multiplexers that has the following image. I says for constructing one it used 7 not gate. But looking at the image I don't know why three of them are needed. Could't you just ...
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FPGA basics and implementation help [closed]

I want to use an FPGA for my project and I want to use an FPGA as I want to implement the functionality of multiplexers within it. Also I want to implement a microcontroller function within an FPGA. ...
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392 views

Audio Switching Circuit - Ground Loop Noise Problem

I'm building an adapter to connect an RJ9 headset output to a 3.5mm jack output(TRRS, mic included). I have designed it so far to use DG409 (4:1) analog multiplexers to choose what lines are connected ...
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2answers
958 views

Two multiplexed 7-segment displays flickering

I'm working on a temperature sensor. I've got: LM35 (Sensor) LM741 (Op-amp to amplify LM35 Vout to 5V) PIC 14F458 The temperature is shown on two 7-segment displays with only one BCD converter (...
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2answers
254 views

Multiplexing 2-Seven Segment Displays using ARM 7

I am currently trying to control two seven segment displays from the same 7 pins (P0.0 - P0.6) of an ARM 7 micro-controller. I am first testing this on Proteus simulation software. I am following ...
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2answers
135 views

Clock multiplexor fanout buffer

I'm trying to find out if there is a clock fanout buffer with two-input multiplexing that allows each output to select the the input independently. I found an IDT part that is a two-input ...
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0answers
66 views

Condition in equating a MUX output to 0

In Verilog, I currently have Z as the output of either A or B in a MUX configuration with a switch condition C to determine whether A or B goes through. My question is, usually for conditional ...
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5answers
317 views

MUX input debouncing?

I am using a CP2103 to interface with a simple 74HC4051 MUX. I want to use 3 of the I/O ports on the CP2103 to control the input pins of the MUX. The 4th I/O port is being used for something else. The ...
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1answer
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Demux from 1 camera to 3 DVR's

Recently I have been experimenting on DVR devices. I have one camera however I want to demultiplex it to three 16ch DVR devices. I have been able to create a daisy chain to connect all 16 channels of ...
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2answers
822 views

200 LED through arduino via SN74HC595N shift register

I'm very new to any forms of multiplexing let alone electronics itself. From what I have researched, I can add more inputs/outputs to an Arduino via a shift register. I bought 10 SN74HC595N shift ...
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86 views

Level shifting at the output of a 2:1 multiplexer

In my design a custom implementation of an Arduino Uno talks to either a CP2104 USB-UART or a bluetooth module, through a multiplexer (74LVC1G3157). Priority is given to the wired connection and hence ...
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2answers
668 views

7 segment LED display multiplexing for 9 digits

I want to build a 9-digit 7 segment LED display with basic components. I am planning to use a 4-inch 7 segment LED display and an Arduino board for my application. According to my understanding, I ...