Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [multiplexer]

A multiplexer selects one of two (or more) inputs based on a control input. It then outputs the selected input.

0
votes
2answers
41 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 ...
-1
votes
0answers
92 views

How many phone calls can you fit on one wire? [on hold]

I want to know how the amount of multiplexing that was usable in practice (not in a lab) for telephony has varied over the last 150 years. I use the term "wire" very loosely as I understand that ...
0
votes
2answers
42 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 ...
0
votes
1answer
32 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 ...
0
votes
1answer
31 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 ...
1
vote
1answer
45 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 ...
0
votes
0answers
37 views

Finding the right multiplexer for my project?

For my project, I am cycling through IR emitters, turning them on and then off. For every emitter, I'm also cycling through all IR receivers, collecting their analog data. I want to use a multiplexer ...
0
votes
0answers
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 ...
0
votes
3answers
157 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 ...
0
votes
1answer
47 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 ...
0
votes
1answer
65 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 ...
0
votes
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), ...
0
votes
1answer
41 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/...
-1
votes
1answer
80 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?
0
votes
1answer
120 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 ...
0
votes
2answers
90 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 ...
0
votes
0answers
35 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 ...
0
votes
0answers
93 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 ...
0
votes
2answers
112 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 ...
-1
votes
1answer
51 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 \$...
0
votes
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 ...
0
votes
2answers
127 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 ...
2
votes
1answer
157 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 ...
4
votes
1answer
536 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 ...
2
votes
1answer
78 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 ...
0
votes
2answers
35 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 ...
0
votes
2answers
58 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 ...
0
votes
1answer
54 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 ...
0
votes
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 ...
1
vote
0answers
272 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. ...
2
votes
2answers
111 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 ...
0
votes
2answers
360 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 ...
-1
votes
1answer
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 ...
1
vote
1answer
88 views

Flashing multi chips with JTAG using openocd

I'm newbie in this field. My task is I have to flash 6 devices with JTAG like the picture below. I'm currently success with flashing one device. Can someone give me advice how to flash all 6 devices? ...
1
vote
1answer
91 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: ...
0
votes
0answers
249 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 ...
1
vote
1answer
138 views

Why can't I implement a frequency divider using a mux in this way?

I found an interesting interview question for FPGA engineer online - Implement a counter with Mux, so I decided to try to do that. I tried to keep it simple and so implement a counter with two bits, ...
0
votes
2answers
50 views

Question on output of an FPGA

I have been trying to solve this basic FPGA problem with multiplexers, but I cannot garner the meaning of the notation 0/1. Can someone throw some light in this regard? What do notations like 0/1 mean?...
0
votes
1answer
68 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, ...
1
vote
1answer
31 views

utilize a single channel to transmit data generated from 16 users (using mux)

I have found this question in a book and find it confusing. The question is, For a communication system, it is required to utilize a single channel to transmit the data generated from 16 users. ...
0
votes
3answers
424 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 ...
-1
votes
1answer
34 views

Upto how much voltage can be multiplexed by 4051B 8X1 IC?

I want to control a 9 volt pump with my arduino, and my arduino is giving around 2V as output through its gio pins ( I don't know exactly the reason why, maybe cause I have lots of other sensors ...
1
vote
2answers
90 views

What is this kind of “Multiplexer” called?

First of all I am new to electronics so i might use wrong terms. What is this electronic component called or is it even a thing (Can it be bought)? I have 10 input wires/channels for example. Only ...
3
votes
3answers
311 views

Not enough pins, looking for a “demultiplexer” that keeps state [closed]

I want to control a simple display with a microcontroller. The display has 8 input pins, the microcontroller only 6. Is there an IC that I can interpose that lets me set the state of each of its ...
1
vote
1answer
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. <...
-1
votes
1answer
109 views

How to use multiplexor 74HC4067

I am using 74hc4067 IC(Multiplexer 4:16) for the extend the gpio pins can i use that gpio pins same time or not? and any one suggest about the ic how it is used?
1
vote
3answers
112 views

What is the best way to step my signal from 5V to 3V3? [duplicate]

I have some analogue signals between 0 and 5 Volts being fed from a multiplexer into another board that only accepts signals up to 3v3. What is the best way to step down the voltage? The signal ...
1
vote
3answers
258 views

Creating a two input two way digital switch [closed]

I'm very much a beginner here, so bear with me. I'm looking to create a digitally controlled switch that has two inputs and two outputs. (Update: The signals are 0V-1V analog.) Here are the two ...
0
votes
3answers
64 views

Decade voltage divider switching

I have a decade voltage divider used for range switching in my project. I need a way to switch the multiple different voltages that the divider creates into one output, sort of like a multiplexer ...
0
votes
2answers
62 views

Can a MOSFET generated high voltage (315v) pulse train be measured using a DMM in AC mode?

I am using a 5V pulse train generated from a UC3845 PWM controller to trigger a MOSFET (K2645) which is biased with 317VDC in series with Rd= 120ohms, Rs=20ohms and primary of the PWM transformer. I ...