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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Not getting correct results displayed from register

I am trying to input the numbers 1,0,3,2,32'hFFFFFFFF,32'h00000001 into the registers 0,1,2,3,6, and 7 respectively. I am doing this through always @(posedge clk) ...
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Raspberry Pi, SSR, Solenoid Valve Power (Multiplexing?)

Background I have a RaspberryPi-controlled irrigation sprinkler system that I am working on. I would like the RaspberryPi and the Solenoid Valve (when the Solid State Relay is closed) to pull power ...
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How to instantiate module with variables

I declared alu_result as a reg because I need it to be a variable data type for my case statement. But when i do this, I cannot pass it my ...
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How to implement an interconnection matrix in VHDL?

I was reading through the documentation of the AXI standard when I came across the interconnection matrix shown below. In short, the interconnection matrix provides a path for several masters to ...
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63 views

Only detect the phase of a sinusoid multiplexed with other sinusoids of different frequencies

Is there an easy way to detect the phase of a sinusoid that has been added to other sinudoids of different frequencies (through a frequency-division scheme) without using a superheterodyne receiver ...
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Multiplexing analog signals

I am designing a system to measure voltages from bio-potential sources and feed them into an ADC after filtering and amplification. The source has the following charactristics: amplitudes are in 10's ...
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Making a circuit entirely with 4:1 MUX, 2-input OR gate and NOT gate

I'm stuck on this question for half of a day. Let's say I have this function That's everything I know about it. Now I must implement it using only 4:1 MUX, 2-input OR gate and NOT gate. I've tried to ...
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38 views

What are the maximum number of RGB LEDs that can be hooked up to just one of these I2C RGB LED Drivers?

So this is LP5036 by TI (Datasheet), a 36 channel RGB LED driver I2C interface-able with a micro controller, which means it can drive upto 12 RGB LEDs individually up to my understanding. But using ...
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Need a solution for a multiple switch circuit

I must preface this with I am not an electrician. Just a hobbyist. I have a unique problem I am trying to solve. With the Covid situation our curling club needs a solution for their double takeout ...
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38 views

Replacing mechanical 8-throw switch with a digitally controlled implementation

I have 8 independent resistive loads on a 1P8T mechanical switch that I use to test a power supply on a circuit board (the switch is connected at the power supply output). I want to replace the switch ...
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Any chance to build a dual 2-to-1 line selector/multiplexer from a single chip?

I a need 2 units of 2-to-1 selector/multiplexer functions on a crammed board, ideally with a single DIP-14 or -16 chip. Looking around for something I found this formula ...
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Suggestions for my fifo arbitration / path merge design

I am currently working on a design which requires me to design a module that combines 2 input streams of data & output it into a single output stream. To elaborate more, i can describe it with an ...
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How to automate continuity tests on harnesses with up to 200 connections

I have some dozens of wiring harness, and always buying more. Nowadays I need to test connection by connection through continuity test with a multimeter and checking on the documentation in order to ...
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Determine the functions of the given multiplexers

In the following problem I want to understand a section of the overall problem. The image only show 2 MUX(es), however the original question has a lot more that are ...
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59 views

How to fix common error causing multiplexed LED segments to flash and dim

I bought an electrical engineering book and was surprised to see the following figure showing how to use a microcontroller to multiplex 4 LEDs using only 4 pins: This seemed right, logically, but ...
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Why simple digital multiplexer uses OR gate to combine chip parts outs?

Why not just wire together outputs of the internal AND gates. For instance, consider the following Mux scheme: Here outputs of the internal AND gates are combined using out OR gate to produce output, ...
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161 views

Where to connect GND on keyboard multiplexer circuit?

Hi all, I'm making a project to read my old calculator's keyboard with an arduino and I've decided to design a new PCB and change it with the original one, as it's easier than trying to hook into the ...
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A basic question about RF multiplexer practical use

Below shows an RF switch(multiplexer): So what I understand is that the same RF input is routed to multiple outputs. This can be I guess used to couple the same RF signal to many different equipment ...
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How to design a multiplexed keyboard circuit for Arduino?

Hi all, I'm working on a project where I'm trying to read my calculators keyboard to know which key was pressed. I've decided over the past few days that hooking into the calculators PCB wasn't ...
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How many multiplexers is too much?

This is a general question. I have a specific task that I am working on. For this task, my solution requires around 300 multiplexers with all of them 16 inputs and 16 bits per input, and a single ...
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Raising ground level of Wemos ADC from Multiplexer

The Setup I'm using a 74HC4051N multiplexer to interface with several analog sensors. I'm using a Wemos D1 Mini to read Z (output from the mux) using the Wemos ADC. I've only illustrated one (of 4) ...
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How do I realize the function using only 4:1 MUX and Inverters?

$$\begin{array}{ccccc} \hline \boldsymbol{a} & \boldsymbol{b} & \boldsymbol{c} & \boldsymbol{d} & \boldsymbol{f}(\boldsymbol{a}, \boldsymbol{b}, \boldsymbol{c}, \boldsymbol{d}) \\ \...
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DAC multiplexer glitch

UPDATE 20th May: Swapped the analog output regulator for an AZ1117-EH based on Peter Smith's suggestion, removed C1306, so now the 3.3VA output should be ok at least based on the datasheet. However, ...
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How to simulate digital control signals in ADS?

I have built a 4to1 MUX in ADS using the 3 default Mux2 components arranged in a tree in ADS (https://edadocs.software.keysight.com/display/ads2009U1/Mux2). Inputs and outputs to MUX are analog ...
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ic to range ADC inputs

I'm trying to figure out how to implement an auto range by changing the resistors values for R2 and R3 with a MCU. First I was thinking of using a mux like the ADG5208BCPZ, but I think I might fry the ...
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How do I use a 4-bit Adder, 4-1 MUX, and 2-1 MUX to implement various micro-operations on registers?

One of the exercises in my Logic Design coursebook requires me to create a circuit that handles following micro-operations on 4-bit registers R1 and R2. R1 + R2 R1 - R2 R2 – R1 R1 – 1 -(R1 + 1) 0 -1 ...
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How to multiplex 22 analog signals

I have 22 analog signals, is there a 22 or 24 channel multiplexer Integrated Circuit (IC)?
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Stereo Vision on Raspberry Pi using CSI MUXing

I've been researching this topic for a while and have finally come up with something but I'm looking for advice and I have a couple of questions. The end goal is to put this on a drone and receive ...
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Why do we use 2 transistors for each path of a MUX in CMOS?

Below is the schematic of a CMOS level 2to1 multiplexer. As you can see that if we want to choose A0, we set S input as Logic-0. My question is that what happens if we remove one transistor from ...
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Can I use an optocoupler to switch an analog signal?

I have this setup to select 1 of 4 signals, pass it through a sensor, then output it to its own output line. It must also maintain all the signals at the output at all times, using optocouplers as ...
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high accuracy analog differential signal switching solutions to prevent distortion (relays?)

first let me define the application and circuit. the application of this is to sence currents ranging from 1nA to around 900mA. to accomplish this two resistors are used, a 10K for the nA range, and a ...
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Connecting a half duplex and a full duplex (2 slaves) to a MCU's UART

I need to connect a half duplex part (1 wire) and another full duplex part (2 wire) to the MCU's UART (only one available), the half duplex part (1 wire) will have a baud rate of 9600bps. The MCU is ...
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Best way to have circuit powered by USB when plugged in and battery when not?

I am building a circuit that uses a rechargeable battery and also has a USB port so it can be plugged in to charge the battery and power the system. I am using a buck/boost converter to supply 3.3V ...
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How do I implement a Barrel Shifter?

I'm using Multimedia logic for this particular assignment, I am to implement an ALU that performs Bitwise Rotation on the input from "A" by the amount defined by "B". Not quite sure how to approach ...
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Using a triac plus an H-bridge to switch DC or AC

I've been working on a controller for inductive loads, and I want the system to be compatible with either DC or AC loads. I've got a 24V to 34V DC boost regulator powering an H-bridge, which is ...
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Same i2c devices on one multiplexer pin

I have an arduino with a multiplexer for i2c expansion (I have multiple same boards exceeding its adress range) where every pin leads to separate sensor box. My question is: is it possible to put ...
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How to mux audio signal output if power is applied

I have the following inputs on an audio device: DAC audio signal Secondary audio input signal The device has one analog audio output. I want the output to source from the DAC when powered, and to ...
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Problem with understanding the circuit related to stable matching security

I am trying to understand a circuit used for stable matching. The paper title is: MPCircuits: Optimized Circuit Generation for Secure Multi-Party Computation and is available : here I am attaching ...
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What voltage range will I need for my multiplexers?

I'm trying to make a Fuzz guitar pedal effect (for a guitarist in the bands I play in), and I found this one: The Fuzz of 1000 Faces Made by Randy Randofo. Below is the circuit from that site: I ...
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Can i use a single NodeMCU IO pin to give select input to multiple 74HC157 ICs(2x1 mux ic)?

I have atleast '6' 74HC157 ICs in my design, with the select lines of all the 6 ICs tied up together(Fig1).I wish to give a logic high or logic low to the select line using just one NodeMCU IO pin. ...
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Multiplexer Simulation failed in Quartus II Web Edition 15.0

I'm currently working on some assignment for digital electronics. Before this, as in , before I reformat my laptop, everything works just fine. After that, After i reinstall Quartus II, the same ...
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Building an Immediate generator for my RISC-V cpu

I'm working on a simulation of an RISC-V cpu (in Logisim-Evolution, not the best, I know). But now, I have almost finished designing it (and so far it works like a charm), and now it is time to build ...
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Digital project

i need some advice how to prepare digital electronic circuit. I have 64 signal lines, every line have a NO tact switch with latch . I need desiplay how much "1 or ON" signal i have and display this ...
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How could a digital multiplexer transmit at a rate higher than its input?

From Wikipedia, "a multiplexer, also known as data selector, is a device that selects between several analog or digital inputs and forwards it to a single output line." https://en.wikipedia.org/wiki/...
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Is time-division multiplexing really a multiplexing method or more of a protocol?

If my understanding is correct, when we are multiplexing, the stations are not supposed to be aware of the multiplexing. For example, if we have computers 1, 2, 3, & 4 talking to computers a, b,...
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Analog multiplexer or analog to digital converter to add analog inputs to NodeMCU?

I asked a question yesterday about the best analog multiplexer to use to add a few additional analog inputs to a NodeMCU. Someone recommended using an ADS1115 analog to digital converter. I am using ...
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54 views

Trouble understanding Charlieplexing problem

I am trying to make a circuit that uses 3 pins to drive 6 LEDs using charlieplexing. The cicuit im using is this: What I don't understand though, is that when I want to turn D1 on, PB0=1, PB1=0, and ...
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Multiple readings on voltmeter

I have a DC voltmeter ammeter display that I want to use for reading voltages (up to 30V) on different channels in a power supply. That display is to be integrated in the supply so I can't do it ...
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54 views

How does a TDM multiplexer “catch” all bits?

In time-division multiplexing, how do we make sure that there are no dropped bits? Consider this example. Let's say we have a 4-to-1 multiplexer. Each input line is 200 bit/s. The unit of ...

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