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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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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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61 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
93 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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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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1answer
33 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
41 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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2answers
110 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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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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86 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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1answer
53 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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3answers
73 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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53 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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111 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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1answer
41 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
65 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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54 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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53 views

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
102 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
49 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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2answers
48 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
53 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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1answer
34 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
70 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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34 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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3answers
190 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
62 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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1answer
94 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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0answers
36 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
58 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/...
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1answer
94 views

Is the 2 to 1 MUX universal?

Is the 2 to 1 multiplexer universal? Can it create a 7 to 1 multiplexer by multiplying its logic circuit?
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121 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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2answers
93 views

Sharing a USB keyboard between two PCs on a button flip

The PCB for the task would comprise of a USB connector, two sets of 4 PTH for the two USB cables (one set towards PC 1, the other towards PC 2), shared GND and TX and a DPDT switch for separating the ...
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37 views

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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148 views

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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2answers
154 views

What is the minimum number of 2-to-1 muxes needed to implement a 129-to-1 mux?

I understand that if the requirement was to implement a mux that was a power of two there is the trick where you can do do x -1, so for instance if I wanted to implement a 8-to-1 mux, I would use 7 ...
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1answer
69 views

How to design a multiplier using only multiplexer?

I am asked to make a multipier that takes a three bits input $$x=(x_1, x_2,x_3)$$ and a control signal \$s\$ so that the results will be a hexadecimal 4 bit number $$z=(z_3,z_2,z_1,z_0)$$ such that \$...
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2answers
39 views

Pcf8574ap to to manage the 4 address pins of 4067 multiplexer?

I have a question. I have a 4067 multiplexer connected to my Raspberry Pi, 4 GPIOs turned on or off, control the channel of the multiplexer. My problem is that if no channel is changed, my code is ...
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2answers
140 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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1answer
211 views

Logic Design simple door security system with using MUX

I draw the cicuit without using any MUX. But my project says I need to use 4x1 MUXs and I couldn't find where to use 4x1 MUXs. I tried put MUX of each output but this was very pointless, no need to ...
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1answer
680 views

8:1 multiplexer to 6:1 multiplexer

I have 6 inputs that I want to insert in a 8-1 multiplexer. I just want to know how to modify the 8-1 mux to support only 6 inputs. I mean the last two rows on the truth table of the 8-1 won't be ...
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1answer
81 views

Questions About BJTs in My Circuit

I have an LED multiplexer circuit (inspired by https://www.instructables.com/id/Multiplexing-with-Arduino-Transistors-I-made/) in which I have set the resistor values to maximize the current through ...
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2answers
39 views

Multiplexer diagram of \$C = A \cdot B\$

I'm having some trouble figuring out how to illustrate, as a diagram, a multiplexer. I realise that a multiplexer takes in a number of input signals and depending on the control sign, outputs the ...
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2answers
62 views

Is there a demux IC that allows a default signal (not just digital 0) to go to the non enabled outputs?

I am trying to control multiple servos using a Demux and I want the selected output to have one pwm signal and then all of the non selected outputs to receive the same default pwm signal instead of a ...
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1answer
66 views

Matrix “Multiplexing” with electromagnets, interesting behaviour

I have an interesting behaviour with my electronics project. I am trying to do something like a LED array but with electromagnets instead. See the schematic below. I built the magnets myself by ...
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1answer
49 views

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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367 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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2answers
159 views

Switching a current source through a MUX

I have a current source of square pulses (0-20 uA) generated by a NI 9265 device. I am trying to build a fast switching circuit using TI CD4051 multiplexer to switch the current signal between ...
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2answers
494 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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72 views

Is Multiplexing Fast Charger Safe? [closed]

I got a original Samsung 2A output phone charger. If I open inside and add some wires and USB port to the circuit board and try to charge 2 devices in same time, what happens? Is it safe? Can I get ...