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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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42 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
52 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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28 views

How can I implement the function y(a,b,c,d,e,f,g) using MUX8? [closed]

Please, you can help me implement the function below using a MUX8. I tried in several ways, but I did not succeed. Here's the picture:
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3answers
60 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
110 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
51 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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1answer
34 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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1answer
38 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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7answers
30k views

How do I control several hundred individual leds with Arduino(s)?

I am working on an electronics project which involves hundreds of LEDs. (Talking upwards of six to seven hundred LEDs...a lot, I know.) Is there any way to control this many LEDs with one or a couple ...
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1answer
63 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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0answers
35 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
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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1answer
904 views

Muliplexer 4-way Implementation proof

There's Mux4Way functional table: I have already know right way for implementation of this chip by using another 3 Multiplexor chips when mux functions as following: ...
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2answers
254 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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2answers
46 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
808 views

200 LED through arduino via SN74HC595N shift register

I'm very new to any forms of multiplexing let alone electronics itself. From what I have researched, I can add more inputs/outputs to an Arduino via a shift register. I bought 10 SN74HC595N shift ...
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1answer
3k 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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2answers
46 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
245 views

Microcontroller signal multiplexing using transistors

I am working on a project which involves reading a 0-5V voltage measure (related to custom-made encoders made of slide potentiometers) to ADC on STM32F103. However, I have only one pin with ADC ...
6
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3answers
8k views

Analog Multiplexer?

I am almost completely new to electronics. Recently I was reading about an 'analog multiplexer' I know what a multiplexer does, and how it works, but is there such a thing as a 'digital multiplexer' ...
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1answer
42 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
95 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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1answer
57 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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1answer
365 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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32 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
167 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
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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1answer
102 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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1answer
55 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
82 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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1answer
92 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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0answers
35 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
116 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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1answer
45 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
85 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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2answers
91 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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2answers
128 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
163 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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1answer
140 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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2answers
434 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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0answers
36 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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0answers
131 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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1answer
61 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
135 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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3answers
499 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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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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1answer
195 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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2answers
468 views

Minimizing(optimizing) digital logic circuit with multiplexer(s)

(this by the way was an exam question) For \$F = \sum m(2, 3, 5, 7, 11, 13)\$, I am trying to implement a digital logic circuit using only the following: 2:1 MUX (cost: 12, and must use at least one ...