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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Use half of an MUX

Can someone give me the schematics of this half 74153 mux?
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CD4053B Triple 2:1 MUX/DEMUX For Switching Three LED Channels To Multiple Zones

My last post (Multi-Zone Addressable RGB+CCT LED Mode Switching) got closed as off-topic because I was “seeking recommendations for a specific product”... I found on my own what I believe to be the ...
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DIY Multiplexing circuit to drive 7-Segment displays like they did in the 1970's

My old CMOS cook-book shows a generic block diagram for a MUX circuit to drive many 7-segment LEDs. It's assumed the reader will use an off-the-shelf MUX chip to drive the displays, but I don't want ...
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Does a demultiplexer affects as a PWM would do?

I'm designing a circuit which has to display 8 numbers. I pretend to do it with 7-segments displays. I dont have enough pins in my MCU to control every single display independently, thus, I will use a ...
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Multiple antenna single rfid

I am using 134.2 kHz RFID reader module. My module has VCC pin (5V-12V), GND , TX(don't have RX pin, Module has one way communication) and reset pin. I need to use at least 4 RFID reader for my ...
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4 votes
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What does INH as an IC pin label mean?

While using a CAD model for a 74HC4051D multiplexer which I downloaded from SnapEDA I noticed that pin 6 is labelled INH rather than E bar (or Enable) as I anticipated from the datasheet. What does ...
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SystemVerilog output issue with "m" in a 5-to-1 Mux

I'm having an issue that I can't resolve on my own. I nested a 2-to-1 mux module inside of this 5-to-1, and no errors occur. Yet my output "m" will only ...
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Design using 5x1 Mux, would this have any complications?

I am building a stopwatch with 5 counters. All are BCD counters with the exception of 1 modulo-6 counter (10ths, 1s, 10s, 1mins, 10mis.) I intend to pass these to the 7 segment displays on my board. ...
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Why is time division multiplexing (TDM) used in the physical layer?

We know that in the physical layer, we don't use any multiplexing, and Ethernet is a baseband channel which carries a digital signal, but I read in the Wikipedia article that TDM is used multiplexing ...
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3 answers
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What is an integrated circuit equivalent for this circuit?

I am trying to design a so called signal switch in which I can direct the signal to either go to NODE1 while NODE2 remains HIGH, or the signal goes to NODE2 and NODE1 remains HIGH. The following ...
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Mux Auto Addressing Circuit

I am trying to build a circuit that will allow multiple (up to 4) muxes on the same I2C line. I am trying to get their addresses to increment with each new board connected. (Lines A0 to A2). Here is ...
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Design a three input 3bit multiplexer. (Use only NAND gates) [closed]

I need to design a three-input three bit multiplexer but only NAND gates must be used for the same.
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LED matrix power and multiplexing

I am trying to build a 7 character LED matrix (so 5x7 x 7 LEDs). I need it to be controllable from an ESP32 with Arduino code. So far what I've learned is that I need shift registers in order to ...
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On the design of a multi-purpose programmable KVM switch

Sorry if this a very basic question for you here. My background in electrical engineering is self-taught only and quite limited. Basically, I wanted to design a simple device which does allow me to ...
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Will a servo be damaged if power is applied, but the PWM signal is low for a longer time than the servo refresh period?

I have a question about servo control (PWM) signal. I want to use one PWM pin to control two servo motors through a 1:2 MUX. That means that depending on which servo position I want to correct, the ...
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4 answers
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Multiplexing with a limited number of pins

I want to create a 10x20/20x10 grid of LEDs by multiplexing. I will probably use an Atmega328p chip for my project, and I obviously don't see 30+ digital pins. Will any of these methods work to ...
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RFID Multiplexing

I'm planning on doing some project just for fun and education purposes. My project involves RFID technology. I don't have much experience on this topic, however I've been doing research on it and I ...
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UHF Colpitts Oscillator in Class C mode problem using Harmonic multiple

I want to increase the frequency of the crystal oscillator oscillating at 25MHz frequency. For this, I added an LC tank circuit to the collector in parallel with each other. I experimented to see if ...
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Noisy behaviour of multiplexer 74LVC1G157

I'm trying to use a WS2812B addressable LED with a multiplexer 74LVC1G157. The WS2812B uses NZR protocol comunication at 800 Kbps and each pixel scan frequency not less than 400 Hz. I have test code ...
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Is a pulled down signal the same as a ground signal?

I am using a multiplexer to switch my UART lines. When the logic signal (A0/A1) is high the UART lines responsible for firmware downloads are connected to my MCU, when the signal is low a GNSS module ...
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Efficient Switching of I/O

Reaching out as I am in the initial stages (read: crude block diagram) of circuit design for a project aiming to automate resistance checks between various connectors. We'll call these connections A ...
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ADG608 PWM on analog input for testing

I bought an analog multiplexer, the ADG608. I want to test the output value on the D pin by sending PWM to one of the analog inputs, the S1 pin. So if I test with a multimeter on the D pin when the ...
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Analog mux with active low enable.I/P and O/P state when enable is High

I am using this mux (74LV4051D,118)from Nxperia for one of my applications.The functional table is given below. When the Enable is High S0, S1, S2 are don't care, and the switch is off. May I know ...
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Terminology: What is the Reasoning for using the Term "Multiplexor"? [closed]

A multiplexor is used for selecting from many possible inputs to a single output. The schematic below displays an 8-way multiplexor. It has 8 possible inputs all going to a single output and has a ...
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Finding a pass-through demultiplexer with latch/register on output

I'm currently working on an Arduino project with lots of digital IO (21 outputs, 8 inputs) and no analog IO. This is more than the number of digital pins on an Arduino Nano, so I started looking at ...
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Steer multiple LEDs with one microcontroller pin

I want to show a program state with LEDs. There are 22 steps, each step is represented by an LED. only one LED is on at a time the sequence is set (forward or backwards). I have only one pin left on ...
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Shared storage between microcontroller and Embedded Linux system

I'm working on a project in which I have to solve this problem. I'm not sure if it's unique, but it's certainly not one I've seen before so I thought it'd be interested to get some input from people ...
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Is there an "Analog Crossbar Switch" that can emulate a keyboard matrix?

I am trying to produce keypresses on a typical keyboard matrix circuit with a microcontroller. It's easily done using CD4051BE multiplexers. However, that approach does not allow to produce ...
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4 channel multiplexer example circuit looks strange

I have a 4-channel TMUX1109PWR multiplexer and from the example circuits and instructions on the datasheet I have made a circuit. The circuit controls the UART connections to an MC. When a USB is ...
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Troubleshooting 3:1 Audio Muxing with Relays. Crosstalk? How to test?

I am switching between 3 audio inputs out to 1 single output. Each input has 4 signals (left and right x positive and negative). I am using 4 DPDT relays (like 8 2:1 muxes). Inputs 2 and 3 switch ...
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Arduino Nano Driving TMUX1208,Logic compatibility

I am using Arduino Nano for driving TMUX1208. The address lines, Enable and I/P are coming from Arduino Nano. The output of the MUX is used for driving a BJT which is used for driving a relay. The Vil ...
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MUX/DMUX Driving a reed relay, output is coming even after the transistor is off

I am driving a relay using a a MUX/DMUX it's P/N is TMUX1308. The relay used is 9011-05-11. The MUX/DMUX Enable pin is active low. What I observed in simulation is even after connecting the EN to Vcc ...
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Pulling the common I/P of analog multiplexer/demultiplexer to Vcc

I am using an analog MUX/DMUX (74LV4051D,118) for enabling/disabling a transistor that is driving a reed relay. The MUX_DMUX selection lines are controlled by Arduino Nano. The common input/output is ...
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MUX between 2 digital signals so that one is normally connected and the other is in high Z without any power draw

I need a simple solution to connecting two digital signals to a single physical terminal. One should be normally connected while the other one disconnected while this does not draw any power. Only ...
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2 answers
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Is there a simple way to make 4-bit discrete multiplexer? [closed]

I want to make a simple discrete 4-bit multiplexer using just transistors and resistors. It would take in 4 inputs and have 16 outputs, one for each binary number. However, I really don't want to make ...
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1 vote
1 answer
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Can I plug directly a 0-10Vdc dimmer current for LED to a SMD4051?

I have a LED dimmer which generates a 0-10 Vdc, can I connect it directly to a SMD4051 such as the Onsemi (on Reichelt) (documentation)? If I understand well, the plexed current must be below the DC ...
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Why are data selectors referred to as "multiplexers" [closed]

I think it would be intuitive if a multiplexer was a component that "multiplied" the number of signals coming out of it, i.e. splits one complex signal into many simpler ones. However, I ...
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Are "switched" TRS connector pins (sense pins) suitable for audio multiplexing?

TRS jacks are commonly available with "switched" or "sense" contacts, like this: This form is commonly used to ground the input pins when nothing is plugged in. But can these ...
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I2C Port on Raspberry Pi RPI4 recognizing arbitrary sensors

I am using a TCA9548A I2C Multiplexer from Texas along with two I2C sensors 'behind' / in series with each of the 8 Multiplexer channels. The Mulitplexer has the address 0x70, the two sensors have ...
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What are the M and N values when modulation formats (QPSK,8QAM) are polarization multiplexed?

I always get confused in the terminology of modulation level (M) and number of bits per symbol (N). Please correct me if I am wrong. Because with these values, my question extends to polarization ...
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1 vote
1 answer
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How can I multiplex the outputs of an XBEE and a MAX485's?

I have a microcontroller that gets fed with 8-bit commands that either come through wires (using the RS-485 standard) or by the RX pin of an XBEE (without using actual switches) I want to multiplex ...
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Is a 8 to 1 MUX transparent?

I want to detect a total of 32 inputs voltages. I plan on using the Atmega32, where the output of the MUX is connected to the ADC pin of the atmega32. I will be detecting these voltages using 5 8 to 1 ...
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Selecting components for high current backup switch

Does anyone have any pointers or tips on how I can select the correct PNP transistors and resistors for the following circuit? If I need to drive up to 1.5A do I need MOSFETS instead of transistors? ...
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Connecting multiplexer/demultiplexer input to Vcc of the same chip. Will this cause any performance issues?

In one of my circuits, I am connecting the I/P pin of multiplexer/demultiplexer to Vcc (5V) as shown below. I have 2 questions. When switching, will the current draw cause performance deviations in ...
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Power mux design

In my board I have two power sources: 5V and 12V I would like to either power a 5v sensor or 12v sensor which will be attached to a connector on my PCB. For that I need to provide either 12v(300mA) or ...
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Analog to 3 bit digital converter noise immunity problem

This task, which at first glance seemed simple enough, caused my left eyelid to twitch nervously. And despite the habit of sorting out my simple things on my own, here I have to turn to the community. ...
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Problem with Interfacing of Multiple I2C Sensors

Problem Description I'm working on a project involving multiple Proximity sensors (AdaFruit VCNL4040). There are 8 such sensors interfaced through a I2C multiplexer (NXP PCA9547). Additionally I need ...
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4:1 MUX using 3 2:1 inverting mux

There is a way to implement 4:1 mux using 3 2:1 mux. but after my derive, i do not see the equation like Y=AS0S1+BS0'S1+CS0S1'+DS0'S1' (treat D0 as A, D1 as B....) what is going on with my derivation?
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Multiplexer behaviour with no power?

I am using the ISL84781 8-to-1 Analog Multiplexer. The use case is that the multiplexer is going to go on a cubesat for testing power output from some experimental solar cells. I am not quite sure I ...
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2 votes
1 answer
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Converting 21 inputs into 8 inputs for EEPROM address pins

I am just diving into the world of multiplexers, so my knowledge of them is not the greatest. I am trying to develop a circuit that can control 10 RGB LEDS (30 total LEDs) via 2 inputs per LED and one ...
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