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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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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29 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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277 views

Alternative-switching multiple busses

In practice, the effects/results described below are much easier to achieve with an MC -- I know. However, for the sake of understanding and learning, I was considering the following scenario to be ...
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80 views

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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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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4k views

designing a 3-bit comparator using only multiplexers

I need to design a 3 bit comparator using only multiplexers specifically 74ls153 and/or 74ls151. I've already constructed the truth table(see below) and realized that A=B is not needed since its ...
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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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642 views

Implementing analog multiplexers in LTSpice and Cadence Virtuoso

Is there any model for Analog Multiplexer compatible with LTSpice or Cadence Virtuoso? A simple 2:1 multiplexer is implemented in LTSpice as a SPDT switch. So how to implement a 4:1, 8:1 or 16:1 ...
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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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264 views

Where is the ground reference when using a thermocouple?

I am using a MAX31856 to read thermocouple voltages. I have an ADG707 differential multiplexer feeding the MAX31856 from various ungrounded thermocouple probes (see diagram below). I am using the ...
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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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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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227 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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35 views

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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111 views

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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391 views

Comparing and adding numbers using multiplexers and comparators

Supposing I have been given three two bit numbers, a1a0,b1b0,c1c0 then what is the best way to design a circuit that gets the largest two of the three and adds them?
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Design a full subtractor using 4 to 1 MUX and an inverter [closed]

I can't wrap my head around it. Any tips? I need to draw a circuit diagram of a Full Subtractor using 4-to-1 Multiplexers and an Inverter. FS diagram: (source: ustudy.in) MUX diagram: (source: ...
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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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1answer
40 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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132 views

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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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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1answer
102 views

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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1answer
122 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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188 views

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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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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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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3answers
58 views

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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134 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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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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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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43 views

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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147 views

Where are all the multiplexers?

I am trying to implement a circuit where 2 SPI drives (basically two masters) speak to 1 slave. Both operate on a 3 wire SPI. Keeping that in mind I was going to have the CLK and MOSI of both as ...
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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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1answer
188 views

Reducing ground level fluctuations when Multiplexing 7-Segment Displays

I am using a microcontroller to multiplex 6x 7-segment displays. Segments are driven by 2N3906’s and displays by a ULN2003. Average segment current is around 9mA, so instantaneous LED current pulses ...
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103 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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105 views

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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1answer
175 views

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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39 views

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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758 views

Multiplexing vs shift registers (input)

I'm going to use a microcontroller to read 80 digital inputs (push button switches). I'm wondering (just to understand, I don't have any critical time constraint) if it would take less time using ...
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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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35 views

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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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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60 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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1answer
121 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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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 ...