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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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Make a circuit that indicates an odd number of ones using a 3-8 Demux and two logic gates

Using 3-8 Demux and two logic gates, make a circuit that received 4 bits and returns 1 if the number of 1's is odd and else returns 0. My try: Using truth table, we get that the desired function is: ...
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71 views

circuit that disconnects a connection

I'm designing a circuit that will disconnect a connection when 5 consecutive square wave pulses are missing. If less than 5 consecutive pulses are missing then I want to reset the counting process. <...
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NX3DV42 Routing

Is it possible to use the NX3DV42 pins designated for USB Data + for Data - ? And use the pins designated for Data - for Data + ?  It is my understanding that because the NX3DV42 is essentially just ...
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Problems sharing data on a common uSD between a camera and micro; - Switch (TS3A27518E)

Having a lot of difficulties sharing a uSD card between two devices (Atmel micro which uses the SPI, and the camera). We used to do this using relays and all worked fine but cards got faster and ...
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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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117 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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368 views

Looking for a 24vac switch from 3v inputs

I'm really new to building electronics, so please forgive my ignorance. I'm looking to be able to supply 24vac (~.5A) to one of 16 outputs using 4 3.3v, 50mA inputs. (Edited) The 4 3.3v inputs are ...
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Multiplexed LED column driver MOSFET doesn't fully turn off without a resistor parallel to the LEDS

I have a board with a 16x10 led matrix. The columns are switched with DMG9933 Dual P mosfets. The rows are driven with a constant current led driver ST STP16CPC26 (similar to TI TLC5956) I noticed ...
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Multiplexing a 16 button keypad to an 8 button remote control module

I am wanting to multiplex a 16 button keypad to an 8 button RC transceiver so that I can have remote control over 16 functions instead of the standard 8. The transceiver I am using is the 900MHz ...
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93 views

Multiplexing UART TX/RX line

I need to connect UART devices in a master to multiple slaves configuration. I need to isolate the desired slave while I'm transmitting, so others will not receive, non-selected slaves must have its ...
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83 views

Sequentially driving multiple stepper motors with 1 driver and 1 controller

I am trying to control multiple stepper motors sequentially (only one at a time) with one controller, one driver a multiplexer and a dedicated "relay" circuit (shown in red). The idea is instead of ...
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Multiplexer handling 16 bits

Design the VHDL components (Register, Decoder, and two Multiplexer 16 bit) and interconnect them to build a register file. The schematic shows only four registers. Your solution should implement ...
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How to choose which function to use depending on the parameter value? (MUX and Gates implementation)

Let's say we have A,B,C , which are all representation of decimal numbers. A and C are 4bit, B is 2bit. if A is any of those numbers (eg: 0,5,6,11 ), the function is F(A,B,C) = AB+C If A is the ...
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74 views

Anode scanning Nixie circuit

I'm looking into driving nixies and i came across this multiplexing circuit I am a little bit confused about the chosen voltages. The 200v line I would assume is to meet the required strike voltage, ...
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61 views

the minimum size of the multiplexer needed?

Suppose only one multiplexer and one inverter are allowed to be used to implement any Boolean function of n variables. What is the minimum size of the multiplexer needed? answer is- 2^(n−1) to 1 ====...
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SHorting MIPI Mux lines

I am currenty using the TS5MP646 http://www.ti.com/product/TS5MP646 . I need to build a 4:1 mux. I was wondering if I need to use 3 muxes, or can i just short the MIPI traces together and control it ...
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1.4V instead of 0V when Arduino signals a LOW

I have motor controlling mechanism as the one shown in the image. I'm controlling the direction of a motor controller from three different sources. DIR1 and ...
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Current Consumption CD74HC4067 for battery powered application

I have some queries and would be very thankful if can clarify the below mentioned questions from the datasheet of CD74HC4067 Link: http://www.ti.com/lit/ds/symlink/cd74hc4067.pdf Link to previous ...
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106 views

4bit demultiplexer with address entries in the EXCESS-3 code

My question is: how to make truth table for inputs on E3? There is only space for 2 bits, and E3 is written on 4 bits as I saw. Should I add more inputs for this situation or do this in different way?
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Poor man's clock MUX with an LVDS input

I want to send two different 10MHz clock signals to a device. My board have tight volume and power constraints and I would rather not use a complicated clock buffer/PLL/MUX IC. The first source have ...
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What's up with my 74HC4052?

I am using a TI 74HC4052E to multiplex a TTL UART on a Microchip PIC32MX695F512 microcontroller. The expected behavior is for the TX and RX signals to pass through the switches unaffected; sadly ...
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663 views

MCP4131 resistor on SDI/SDO multiplexed pin?

I'm using the MCP4131 digital potentiometer to control the brightness of a LED using an Arduino Uno. The MCP4131's interface is SPI and it has a multiplexed SDI/SDO pin (pin #3). The datasheet ...
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STM32F042 ADC Interrupt with STMCUBEMX

I need to read 15 channels ADC. However my MCU is specific named STM32F042K6T6. I decided to use an analog MUX to read every channel from just one pin. But, I didn't read accurately the datas by ...
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Will this LED clock circuit work?

I am making a LED wall clock with an ATmega328P Xplained Mini board, 64 LEDs (4 is for the "main ticks" 15,30,45,60) around the PCB to show the seconds, and a 7 segment 4 digits display to show the ...
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336 views

Difference between multiplexer and decoder

What is the difference between a multiplexer and a decoder? Lets assume a 2-to-4 decoder and a 4-to-1 multiplexer, what I understand is they both select one input based on the selector's combination. ...
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184 views

high voltage multiplexer for battery cell monitoring

I'm working on a battery management solution with 50.4V battery (36 cells in series with 1.4V a single cell voltage) for automotive application. i'm planning on using multiplexer and differential ...
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Designing Battery Power System For Robotics

I'm building a mobile robotics project for a class and I'm trying to figure out how to (or even if its necessary) to design a nice battery power system for it. I sort of wanted to learn how to build a ...
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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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120 views

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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62 views

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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388 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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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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248 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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Discrete logic multiplexer

I posted a more in-depth outline of what I'm doing here, but basically I'm building this circuit (for n=3): The circuit displays an output based on the combination of three three-input DIP switches. ...
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Multiplexer between Capacitor and Inductor (Tank circuit)

I am trying to design an inductance and capacitance meter with multiple scales, to achieve this I thought a multiplexer can do the job, but it didn't. My question is: What is wrong in this design ...
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1-bit maximum selector (iterative design)

I'm trying to create a 1-bit maximum value selector with an iterative design that can solve larger problems. I understand that I go from the most significant bit (MSB) to the least significant (LSB), ...
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Can one (or 2 connected) multiplexer control 10 other multiplexers?

I'm in my infancy with electronics. I took a course in college way back before a lot of you were born (30 years ago). So, forgive my ignorance if the question is somewhat trivial. I've got an idea ...
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How to create 1:4 Demux diagram using 1:2 Demux?

By 2m = n where m is the number of select lines and n equals the number of outputs (4) I found that I will need 2 select lines in total. But, I don't even know how to start drawing the actual circuit ...
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287 views

Variable input MUX in Verilog

What's the best way to make an N:1 multiplexer in Verilog (NOT SystemVerilog), where the maximum N is 64? Each input is 32-bits wide and there are N such inputs. Verilog doesn't allow two-dimensional ...
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Power mux (TPS2115A) has a huge voltage loss?

I have a MCU which I need to be powered up after a power failure for a few seconds - super capacitors are too large for this application - I wanted to use a power mux (TPS2115A) to switch to a battery ...
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185 views

Connecting 5 MPU6050 IMU sensors to an Arduino Uno

I'm needing to connect 5 MPU6050 IMU sensors to an Arduino Uno to simultaneously obtain data. I've tried searching for a solution, however there are no clear instructions as to how this is done, ...
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38 views

Measuring resistance at every point in multiplex circuit with analog-to-digital IC

Here I have basic LED multiplex IC (HT16K33). I want to add different resistors in my multiplex circuit and measure them at each x,y position with my ADC IC (ADS1115). For some reason it won't ...
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Using a clock to increment a counter which drives a mux?

I am trying to program this functionality onto a Xilinx FPGA; however, when I program it to do this, I get no output. My situation is as follows: I have 12 bits of data (in parallel): the first 6 ...
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99 views

High/low order of the 4 select inputs of a 16-to-1 SN74150 MUX

I'm looking at a Texas Instrument Data sheet for an SN74150 16-to-1 MUX but I can't find which of the select inputs (A, B, C, D) is the higher order and which is the lower order. Does anyone know ...
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177 views

Multiple serial ports to an old 8051 I have numerous of

Ok, I own quite a few of the AT89S52 IC and the AT89C4051. Both have only UART, but my project requires two because the same device will control a radio module that requires a UART for interfacing and ...
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252 views

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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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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158 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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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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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 ...