Questions tagged [multiplexer]

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

Filter by
Sorted by
Tagged with
1
vote
2answers
155 views

Create MIDI instrument with 52 inputs and low delay [closed]

I'm building an electric xylophone, or at least trying to, which is velocity sensitive. I approach this by using piezo-sensors. The sampling of the notes will be done on a raspberry pi. So far, I have ...
0
votes
1answer
182 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 ...
1
vote
1answer
39 views

NX3DV42 Routing

Is it possible to use the NX3DV42 pins designated for USB Data + for Data - ? And use the pins designated for Data - for Data + ?  It is my understanding that because the NX3DV42 is essentially just ...
0
votes
1answer
26 views

How can I output to one of 4 different outputs without using a demultiplexer?

I do not have a demultiplexer available, so I need a substitute. I have a TTL signal and I need to output the signal to output 1, then output 2, then output 3, then output 4 in sequence, meaning that ...
1
vote
2answers
203 views

Can I multiplex a thermocouple (using a MPC507) without losing significant accuracy?

I would like to reduce the number of thermocouple to digital converters (MAX31856) needed on my board for the sake of space. One approach that I have considered is multiplexing the eight different ...
0
votes
0answers
111 views

High/low order of the 4 select inputs of a 16-to-1 SN74150 MUX

I'm looking at a Texas Instrument Data sheet for an SN74150 16-to-1 MUX but I can't find which of the select inputs (A, B, C, D) is the higher order and which is the lower order. Does anyone know ...
1
vote
1answer
194 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 ...
0
votes
0answers
210 views

Multiple serial ports to an old 8051 I have numerous of

Ok, I own quite a few of the AT89S52 IC and the AT89C4051. Both have only UART, but my project requires two because the same device will control a radio module that requires a UART for interfacing and ...
0
votes
1answer
272 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
votes
1answer
6k views

What is the difference between an analogue multiplexer and digital multiplexer?

As far as I know, analogue multiplexing is used to take voltage samples from many channels in a short time. It passes the voltages from an input to the ADC without amplifying them. I guess buffer them?...
0
votes
1answer
397 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?
-2
votes
2answers
3k views

How do I construct a 4x1 MUX using only 2 input NAND Gates?

I’m trying to create a 4x1 mux using only 2 input one output NAND gates
0
votes
2answers
124 views

How to drive 4000 LEDs using as few pins as possible?

I need to be able to control ~4000 LEDs with as few digital IO pins as possible. I can't really explain why as the project I'm working on is confidential, but the plan is for this project to be ...
0
votes
1answer
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 ...
0
votes
1answer
296 views

Help with 16:1 Mux IC Wiring

I have these ICs and I want to wire them like the sparkfun 16:1 mux breakout board. Here is what I have so far. Is this correct? However I feel like these are not the same as the actual ICs. Also ...
3
votes
4answers
2k views

Anode driver for Nixie clock

I'm working on my first nixie clock which will be running with Arduino, using a 74141 nixie driver for the cathodes (common for 6 tubes) and multiplexing the anodes. I am using a MPSA42 NPN ...
3
votes
3answers
2k views

Switching a CAN bus

I am designing the controller for a needle test station intended to do functional tests of a 20-PCB panel in a production line. The controller has to sequentially interface over CAN to 20 devices ...
1
vote
2answers
164 views

multiplexing solution for high number of inputs in a grid pattern?

So, I'm working on a project right now to implement a large electrode sensor array for measuring bio-potential (128 x 128 sensors) that are in close proximity to each other (~0.06cm along horizontal ...
0
votes
2answers
509 views

Can a 4051 Multiplexer accept +/- 12v bipolar power

I'm looking to use a CD4051B multiplexer as a digitally-controlled switcher for audio signals. The audio is coming from the HP / BP output of a voltage-controlled filter in a synth. The signal ...
2
votes
1answer
709 views

Will this I2C isolation circuit work? [closed]

I am using an LTC2945IMS to monitor power in a design I am working on. It uses i2c to communicate with a MCU and must be isolated. The chip has two separate pins for the data line (SDAI and SDAO) for ...
0
votes
2answers
309 views

How can I use a dual 4-channel analog multiplexer independently?

I have a CD4529BCN Dual 4-Channel Analog Data Selector (datasheet). Here is the truth table: Here is the problem: I have two sensors which are resistive. I want to read their voltage via a ...
1
vote
2answers
610 views

How to switch between two digital signals?

How can I switch between two PWM signals? I would like to control a servo motor by two different PWN source. these two PWN signals are coming from two PID controllers. I want to switch between these ...
1
vote
1answer
2k views

How to simply this 2 to 1 mux boolean expression

I am going through this tutorial for a 2 to 1 mux. They create this circuit: They then derive this boolean algebra expression and simplification: I'm confused how they made the simplification though....
1
vote
4answers
3k views

Difference between i2c switch and i2c mux

I am working on a project which involves reading from multiple IMU sensors on i2c protocol. They have a fixed i2c address and hence I feel the requirement of some sort of multiplexer. On some ...
1
vote
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 ...
1
vote
0answers
47 views

With multiplexed displays, what is the correct term for a single “frame”?

Let's take a look at the following animation demonstrating time division multiplexing. Source As you can see and probably know, the image is shown by displaying one line after another in rapid ...
1
vote
2answers
83 views

How to detect multiple digital sensor with one micro controller input?

I would like to connect multiple TSSP4038 sensors together in such a way that I only have one output (let's call it Y_out), if any of the sensors output is HIGH then Y_out is also HIGH (regardless if ...
0
votes
0answers
285 views

Latency of Components

Latency comparison between the addition of dependent modules vs independent modules? For example, a 32-bit adder made up of thirty-two 1-bit adders. Each 1-bit adder calculation depends on the ...
0
votes
1answer
1k views

Implementing 3 variable boolean function od 2-1 multiplexers

Recently i've been given a task from my lecturer to implement \$f=\sum(1, 3, 4, 5, 7)\$ on "2-bit multiplexers". That's it. I assume he meant 2:1 MUX. I've came up with following k-map... +------+--...
1
vote
1answer
137 views

How to select line to a 1:4 demux in verliog from a NIOS II softprocessor

I am new to verilog. I'm using this 1:4 demux as described on this webpage (code supplied). 1:4 Demux verilog code My question is in relation to the select line. I have a soft processor NIOS II on ...
0
votes
1answer
27 views

Bus Exchange From first Rising Edge

I would like to create a circuit that takes in two pulse trains that exchanges output lines depending on which pulse comes first. Currently I am using an ON 7WB383 and switching the signal manually by ...
1
vote
0answers
131 views

Analogue multiplexer using JFET for small signals

I'm working on a circuit with a non-inverting amp and I would like to switch between two reference voltages, both with low output impedance. So in effect i want something like this: simulate this ...
1
vote
5answers
656 views

“Multiplexing” thermocouples to an IO board

I'm trying to solve a problem on a project for one of my customer, 'cause we are having hard times to find an appropriate solution. He needs something really simple (more on this later) and as we are ...
1
vote
1answer
39 views

Multiplexing a set of signals

I want to multiplex 8 input lines but have 2 output lines. I'll have two select lines, based on which, the output lines will carry 1st-and-2nd or 3th-and-4th or 5th-and-6th or 7th-and-8th input lines. ...
1
vote
1answer
73 views

fpga multiplexor - select line controlled by a soft processor

I have 5 pins coming into an FPGA (inputs). I have two different sets of 5 output pins. I want to select which set of output pins that I connect the input pins to. What kind of multiplexer is this ...
2
votes
1answer
169 views

7-seg. Display Multiplexing Disturbing Real-Time Clock

One of my colleagues is designing a digital clock with 7-seg displays. The clock function is shouldered by a Real-Time Clock IC, PCF8563. The RTC IC is clocked with a 32.768kHz crystal and its ...
1
vote
0answers
108 views

prioritized power path controller for battery backup [duplicate]

I'm searching for a simple solution for a prioritized power path controller to maintain a system supply line through a rechargable battery when the main supply fails. My goal is to make the cheapest ...
4
votes
5answers
888 views

Interfacing large number of UARTs to PC

I would like to find a good way to interface many UART devices (sensors) to a single PC for data collection and processing. For my use, there may be as many as 100 UART devices each operating at ...
0
votes
1answer
90 views

DeMux Output - Large Pulldown Resistor Can't Pull Output Low

I'm using the SN74CB3T3257 as a demux in a circuit I'm working on. The relevant parts of the circuit is approximately this: simulate this circuit – Schematic created using CircuitLab What I ...
0
votes
1answer
157 views

multiplexing 256 led with atmega128 not working properly

Original/First version: Second Version: Second Version display, Brightness not the same for all led!! Originally, I have 8 resistors for each 8x8 dot display, then in this newer version, trying to ...
0
votes
3answers
266 views

Explain the internals of digital multiplexers

We were taught ayt our school about data selectors or multiplexers as basically a OR gate taking input of some decoder (Binary to Decimal,Bin2Hex,etc.) with an EXTRA INPUT Lines attached to the AND ...
0
votes
1answer
42 views

Multiplexer circuit

I would like to design a circuit to measure the humidity of the soil by connecting sensors to a 16:1 MUX . I have never worked with MUX and i dont know which one to use or where to begin. Can you ...
1
vote
0answers
64 views

Wiring Organ; Electrical Interference?

General Description (A rough block diagram is linked below.) I rewired my organ with digital electronics. I have a microcontroller (Teensy LC) that is used to scan the keys (pressed or not). It ...
0
votes
1answer
96 views

multiplexer with floating outputs

I have actually a solution based on a multiplexer (CD4051) which drives 8 outputs, either at 0V or 3.3V (the input is at 3.3V). Each output of the multiplexer drive a NMOS and the goal is to have a ...
0
votes
1answer
67 views

Worried about channel ghosting in DAQ system - Need unit gain buffer?

I am working on a redesign of a test box we have at work. There is a transmitter that is sending data to a recording system (in my case the dewetron trendcorder with Trion BNC modules). We previously ...
0
votes
2answers
674 views

4x4 Pressure Sensor Grid Pin Saving

I'd like to make a 4x4 pressure ( force resistance) sensor grid to use with an arduino. But 16 sensors sure need a lot of pins. During my research on this topic I stumbled upon a couple of ...
0
votes
1answer
148 views

Trying to multiplex voltage reference gives incorrect output

I'm trying to make the voltage reference for an INA214 opamp selectable between GND, 4.5V and 10V. I'm using a CD4051B multiplexer. However, the 10V VREF gets pulled down to 5.84V, and I can't figure ...
1
vote
1answer
135 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
0
votes
0answers
58 views

Multiplexed CAN Bus

I have a need to mux the CANH/CANL lines from a single MCU controller/transceiver to multiple pins on an existing connector series. The flow I am looking at would be something like: MCU <--> Xcvr ...