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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How to use two Demux to index a matrix layout of registers

Consider the following. Let's say for simplicity sake I have an arrangement of 8 bit registers in a 4x4 matrix layout. I could easily use a Demux that has a 4 bit input select line for the addresses ...
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30 views

Controlling a 19x19 input matrix

I'm designing a go board that can detect where pieces are placed through a raspberry pi for the purpose of game recording. I'm planning to put magnates on the bottom of pieces and do the detection ...
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Choosing multiplexer to convert current to different voltage

I want to convert 0-20mA current to 0-1V , 0-5V , 0-10V with different resistors using a multiplexer, but the problem is that my output voltage is not correct and off more than 1V. I know that ...
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Designing an analog high voltage multiplexer

I'm putting together a design for a vacuum tube tester and curve tracer. The circuit I want to build is capable of powering up a tube and measure the voltage and current at the tube's pins. I would ...
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72 views

Digital signal appears to improve with length of wire - troubleshooting multiplexed LED display

I’ve created a 5x5 multiplexed LED display that’s behaving very strangely. It appears to have something to do with the data signal from the micro controller to the first shift register which appears ...
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Forming mux demux trees by cascading using strobe

Some definitions When implementing M:1 muliplexer using N:1 multiplexer, where M>N, we cascade N:1 multiplexers, which forms tree of multiplexers. Similarly, when implementing 1:M de-muliplexer ...
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54 views

Multiplexer to switch between many sets of 8 channels [closed]

I have many (up to 16) 8-channel "buses" (not digital, but analog) each with signals which I want to read with a single 8-channel analog-to-digital converter (ADC). I would switch between these ~16 ...
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41 views

Using multiple TCA9548A multiplexers

The case is that I have 5 temperature sensors. I want to connect 4 of them to the first TCA9548A (TCAADDR0), the SDA and SCL busses (from the ports 0 to 3) and connect the fifth one to the second ...
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How to connect a Multiplexer?

I am trying to simulate a Multiplexer with NI Multisim. Unfortunately it just won't work. Can someone help me to connect this one properly? Link to Datasheet Thanks a lot for any help in advance. ...
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2answers
238 views

controlling 3 relays with 1 signal wire

my goal is to create circuit which would be able to trigger one of 3 +12v relays (only 1 relay could be active at once). Thinking to use 3 switches and mux41 with demux to send encoded signal through ...
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55 views

How to do Bidirectional multiplex switch signal over two wires?

I'm trying to remote control the doors in my stand-alone garage over two wires. There's three operate switches in the house, and three SPDT position switches on the doors. I think I want to end up ...
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MUX (multiplexer): Do all people follow the convention that the upper value is let through if sel is false? [closed]

Do all people follow the convention that the upper value is let through if sel is false? (assuming the multiplexor is facing to the right as shown on the image) I am asking this question because it ...
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41 views

Multiplex Sigma Delta ADC outputs (AD7401A)

i'm measuring 30 different voltages without common ground. Each voltage is measured by an AD7401A Sigma-Delta modulator/ADC. The signals go into an FPGA (Xilinx Spartan 6). But the I/O-Pins are ...
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1answer
120 views

Arduino emulating a keyboard that has a demultiplexer

I have a old typewriter which I want to automate with an Arduino. The way I am trying to do it is to replace its keyboard with the Arduino and make the Arduino emulate the keyboard i/o. The keyboard ...
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1answer
64 views

Do electronic fiber optic selector switches exist?

From my research, I have been having a tough time finding and specifying a fiber optic selector switch or multiplexer. Do fiber optic selector switches exist? Background - Simple I have an ...
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Is space division multiplexing really multiplexing?

I don't know much about electronics, but happened upon the Wikipedia article for Multiplexing, which defined it as: a method by which multiple analog or digital signals are combined into one signal ...
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Designing a 4053 IC robotic control circuit for interfacing with Sabertooth motor controller?

I am designing a control circuit for a robot and was recommended to use a 4053 IC to achieve analogue multiplexing. PROBLEM The Sabertooth 2x60 motor controller I am using is running in analog ...
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How is this multiplexer built? (on a logic gate plan)

I was watching this CrashChourse CS video (7:41) to learn about RAM. Real quick, this is the definition of a multiplexer: (source) MY QUESTION Since the Multiplexer only has a single output, how ...
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Open circuit ground multiplexing?

I am experimenting with electrospray ionization. The setup has a 4kV power supply connected to an electrode that is separated from a return lug (or ground plate) via an air gap, followed by an inline ...
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1answer
62 views

Help with following question about Muxes?

Could anybody provide help in answering this question? I'm pretty sure I should use a Kmap to analyze it but not sure how to do so.
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TPIC6C595D Q0 pin is always high

Good day everybody! So I have a LED clock circuit, which I designed, powered by an atmega328p xmini, and whatever I do the first pin of the shift register which does the current sinking (TPIC6c595D) ...
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1answer
63 views

36:6 analog multiplexor?

I'm trying to connect 36 analog voltage sensors to the 6 analog pins of an Arduino Uno and cannot figure out the simplest way to go about it, given that I need to be able to accurately read a voltage ...
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4answers
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Problem with MOSFET making my current dissapear

The current of 150 mA has to go around 18 different circuits, one at a time. Now I am trying to use 18 LDOs as suggested below. But now the problem is that the current that is supposed to be 150 mA ...
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How can i create a boolean expression using a 4 x 1 mux?

I have got a question that asks Consider the Boolean expression \$F(A,B,C) = \bar{A} \bar{B} \bar{C}+ AB+ AC\$ . Implement this logic expression using one 4x1 multiplexer. Do not use \$C\$ as an input ...
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36 views

Choosing the best approach for data selection in a datapath

For a university project, I have to design and construct a very simple CPU including the ALU. In order to select between different data lines that go into the ALU(32-bit data line), I have thought of ...
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1answer
64 views

Multiplexing common anode 7 segments using only 2 shift register, darlington array, and transistor

I'm trying to multiplex up to 8 digit common anode 7 segment display using only 2 shift registers chained together in series driven by arduino. So it would need only 3 pins (trying to save up pins ...
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114 views

Analysis of this analog mux circuit

I would love an analysis of this circuit, as I suspect the mux is trying to digitally adjust the gain of the amplifier. But what is it adjusting, current gain or voltage gain? And how?
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Designing 4-bit prime checker with Demultiplexer

I found a question that wanted to design a 4-bit (A B C D) prime checker (2,3,5,7,11,13) with 2 Demultiplexer (1-to-8 DEMUX). (And minimum amount of other gates). I know one way is connecting "B C D"...
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94 views

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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61 views

Reading 13 FSR over a multiplexer

I've made a design for reading 13 FSR with only 1 channel ADC. I want to apply the DAC voltage to only one of the FSRs using MUX. But when I choose one, I see voltage in others. For example, when I ...
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84 views

On-the-fly routing of digital and analog signals using unbuffered analog crosspoint arrays?

The issue I have is strongly related to a question which was asked over here. Unfortunately I did not find the answer I was looking for. Digging a bit more I've came across a class of IC's named ...
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55 views

4x 2:1 Multiplexer with multiple select lines. Does that exist?

I have been checking different supplier websites, and can't seem to find what I am looking for so I am wondering if it even exists or not. I am looking for a 4x 2:1 MUX IC with 4 select lines. I am ...
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122 views

PIC I2C communication problem with I2C multiplexer

I need to read data from 3 of the same kind of batteries with SMBus so I decided to use an I2C multiplexer for this purpose. I can communicate with 1 battery without any error. But I cannot ...
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57 views

Multichannel Design with Multiplexers

I am trying to use four MUXes to send 4x8 identical sensors onto an I2C bus. Let's call my four types of sensors A,B,C,D. Eight of each means 32 sensors that I need to 8:1 MUX onto one I2C bus. I'm ...
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43 views

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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1answer
67 views

No Output Voltage On Power Mux

I am building a board based on a working reference design. I've obtained the assembled board based on my design but the '3V3_OUT' signal is failing to carry power anywhere on the board. The issue ...
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65 views

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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1answer
116 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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2answers
57 views

Multiplexing high current connections?

Noob question here. Currently I'm using a darlington transistor array to drive about 14 IR leds. I want to be use a CD74HC4067 multiplexer to simplify and shrink things up a bit. The IR led's I'm ...
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54 views

Metal detection with a coil matrix

I have an 8 x 8 grid and would like to detect where on the grid I place a metal object. I'm currently working with the TDA0161 metal detection IC, and so far have the following setup with detection ...
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1answer
66 views

Implementation of boolean function using multiplexer

Is the following question correct? Consider the Boolean expression F(A,B,C) = ABC+ AB+ AC. Implement this logic expression using one 4x1 multiplexer. Do not use C as an input to the selectors of the ...
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38 views

Switchable Multiple Channel Current Sink

I want to create a multiple Channel Current Sink which is switchable. I already have 2 designs, but i am not realy happy with both of them. Maybe some of you guys have a Idea how to improve one or a ...
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1answer
104 views

Measure battery pack cell voltages with analog multiplexer and instrumentational amplifier

I'd like to measure the voltages of individual lithium based cells (LiPo, LiIon, LiFePO4) in a battery pack (up to 4 cells in series), using an ADC. I was thinking about the following approach, using ...
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35 views

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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212 views

Reading 32 ADC channels

I have been working on an application which must read 32 analog channels at least 200kS per second. 0 to +3.3V 12 bit resolution 1% accuracy I've come up with 2 potential solutions: 32 ADC ...
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1answer
79 views

VHDL SLV dynamic width slice assignment

I have some code that takes in 2^X samples and outputs 2^Y samples, where X and Y are integers and Y is less than X. So for example X=6,Y=4, I ingest 64 samples and output 16 samples. As of right ...
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127 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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37 views

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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1answer
79 views

PNP array TD62783 output is not closing correctly when input signal goes down

I have TD62783 powered from 12V rail, inputs are driven from 5V rail by HC540. Each output has bunch of leds on the other side along with constant current sink (multiplexed 7 segment display). IC18/...