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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PCB OF A CLAMP METER WITH MISSING CR7, C95 [closed]
Please assist to know the smd components details,on PCB of Fluke 375 clamp meter.
Picture is attached.
CR7 3PIN and C95 2 pin.
CR7 might be a double diode, transistors are labeled as Q on this pcb.
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USB3.2 backwards compatibility in KVM
I am making a KVM switch, and I have a USB 3.2 Gen 2x1 connector.
From what I have read, USB 3.0 and better has 9 pins, and USB 2.0 has 4. I have found a MUX which suits my needs: the TMUXHS2414, but ...
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7-segment 4-digit display ghosting
Currently I'm tinkering with my ADC project with my ATmega328. I asked my microcontroller educator how I can fix this issue with the ghosting. I thought it had something to do with frequency or the ...
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What kind of switching system can I use for a massive array of high-impedance electrodes?
My application: I am attempting to create a device to map redox potential in soils at ~1 mm resolution, using a grid of platinum electrodes.
Background: Redox potential is a measure of the "...
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Verilog simulation unexpected behaviour in a simple mux design (Using EDAPlayground and EPWave)
I am experimenting with EDAPlayground, and I have created a simple structural module that should take the MSBs from one input and merge it with the LSBs of the other and vice versa, using 2 input ...
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Is TMUX646 suitable for 10 input signals in parallel?
I'm trying to determine whether the TMUX646 matches my needs.In the data sheet it is written: The TMUX646 is an optimized 10-channel (5 differential) single-pole, double-throw bi-directional switch ...
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Do the I2C pullup source and sensor input power sources need to be the same
I am using a Particle Boron or Photon 2 which both state the I2C pullup should be 3.3v.
I currently have a AHT20 temperature sensor and a 20x4 LCD on the I2C bus, which has been running great with the ...
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Do there exist I2C address-remapping "NAT" chips?
For I2C devices that do not support address changes, do there exist "I2C address proxies" that can sit in front of the statically-addressed device and proxy a different address to the chip ...
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Read multiple PT100 sensors with MAX31865
I'm building a temperature logger with four PT100 sensors. I've already decided to use a MAX31865 converter (just the IC), 3-wire PT100s and the device will be a Raspberry PI HAT - the PI will talk to ...
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I2C Addressable UART Multiplexer
I have a number of "smart" LCDs which have their own internal processor and can communicate over UART. Unfortunately I have ran out of GPIOs on my ESP32. I was hoping to find a demultiplexer ...
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MUX in a 4 bit by 3 bit memory
Here is a 3-bit adressable memory with an adress space of 4.
My question is why is the book calling the 3 rightmost highlighted circuits MUXes? And what type of MUXes are they? 4:1 MUX? And if it is ...
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4 to 1 MUX representation
Here's a representation of a 4 to 1 MUX that I found in a book called: Introduction to computing systems from bits and gates to C/C++ & beyond by Yale N. Patt and Sanjay J. Pattel
My question is ...
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Why don't analog multiplexers specify PSRR?
I am designing a PCB that needs to switch an analog signal coming from multiple sensors with a multiplexer. I need to be able read single uVs of changes on the signal. I am looking to power the MUXs ...
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High gain op-amp, but still being able to get 0V output
I'm not a learned electrical engineer, so all my knowledge is self-taught and thus a little spotty. I hope you guys can help.
Here is my problem:
My goal is to switch between ROWPIN 1-4 (there are ...
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How to multiplex open drain sensors
I have 64 digital hall effect sensors with open drain outputs (A3144), and would like to read their outputs with an MCU. Is there a simple way to multiplex these sensors to limit the number of IOs ...
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Collecting signals from 128 sensors with Arduino
I am using eight 74HC4067 (which are 1x16-Channel Analog multiplexer/demultiplexers) to collect data from 128 sensors. Now that translates to 8 data pins on the Arduino which I don't have.
Is there a ...
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Button multiplexing supporting multiple simultaneous button presses?
I'm looking to build a MIDI controller from some hardware I've salvaged, which includes 30 non-latching buttons and 30 LEDs. I'd like to base the system around an Arduino board (specific type TBD ...
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Mux operation with feedback loops
I'm helping a young friend with a homework problem... I took digital circuits 25 years ago and thought I could help her quick but I'm stumped!
This mux looks impossible but maybe that's because it's ...
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How can I realize full subtractor using 1X4 DEMUX and logic gates? [duplicate]
I know how to make it from 1X8 btw.
Also , realize full adder using 1X4 DEMUX and logic gates
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LED Multiplexing - Large Matrices - Efficient Selection of Scanline Groups
I have a 4 x 8 matrix of RGB 8-segment displays, (short for a 7-segment 'digit' plus a dot pixel, for which each segment (as well as dot) contains: 1x red LED, 1x ...
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How to make fast capacitive touch buttons without a microcontroller
(I have already read this question.)
I am looking to make a musical instrument with a series of capacitive buttons in a grid of 17x4 buttons, with a length of about two feet and a width of three ...
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Drain Terminal of a Multiplexer
I am confused about some of the aspects of how a multiplexer works. In particular, I am working with an ADG508A multiplexer. Looking at its functional block diagram (Fig 2, top panel, page 1) and the ...
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Signals has a different ground from power ground in multiplexer IC
I am looking at this multiplexer CD4051BE. Below is the pinout of the chip. I power the chip with 12V and feed PWM signals into the channel pins of the chip. However, the PWM signals have their own ...
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FSUSB42 Schematic Review
I am using FSUSB42 in my project.The maximum recommended supply voltage of this IC is 4.4V (Absolute max is 5.6).
In my board 5V supply rail is available.I know I can power the device with 5V supply ...
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Analog Switches
For a project I would need analog switches or multiplexers. I want to switch a Signal (3-10V, up to 10 kHz) onto different outputs. In the best case it should be possible to go up into the MHz range ...
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5:1 Mux design for a common bus system
I am tinkering with logic gates preparing for an exam and came across a question that states the following
Construct a common bus system for six registers where each register has five bits.
the ...
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LED : Multiplexing : Color-mixing (RGB)
With a single RGB (red-green-blue) LED, if:
Enabling the colors non-simultaneously (via multiplexing or a similar form of PWM),
At a frequency which is sufficiently-high to make flicker indiscernible,...
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4-Bit Barrel-Shifter with 4x1 Multiplexers
I have a question regarding an exercise I have to do. I am supposed to build a 4-bit barrel-shifter using 4x1-multiplexers. I have 4 inputs and 4 outputs. The position shift should be n=(2*B)+A. I ...
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Voltage leak when muxing Li-ion cells for voltage measurements?
A disclaimer before I dive in, I am not working with a battery pack. Anytime I refer to Li-Ion cells or 18650s, I am trying to handle each cell as an individual. I am actually avoiding building a ...
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DG408 Multiplexer Issue
I connected a DG408 8:1 Multiplexer to 6 Futek Load Cells; the signal of each load cell was amplified by an "ICA-1H" strain gauge amplifier. The output signal of the multiplexer was ...
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Using the same ultrasonic transducer for Tx and Rx in distance measurement
Goal:
Measure distance to surrounding objects using 5 automotive grade
ultrasonic transducers mounted to different points on a small robot.
Requirements:
Multiplex the drive and receive pulses so ...
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Scanning a keyboard matrix
I recently watched a video on YouTube by Branch Education.
In this video, they describe two methods for scanning the matrix:
Sequentially apply a voltage across each column so that at any instant ...
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What are the possible implementations of LUT on silicon?
I'm looking for the possible ways to implement a LUT. The only way I know is to use Flip Flops to store the outputs and a MUX to select the output using the input as a select signal. Is there any ...
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LED : Minimum luminance by lighting
If 7-segment displays on a portable device to be easily legible from say, 10 feet, laid on a surface facing up at a light source (indoor or daylight), what are the minimum luminous intensities I ...
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Solve the multiple ideal diode circuits problem
Find the Q-points for the diodes in the four circuits in Fig. P3.68 using (a) the ideal diode model and (b) the constant voltage drop model with Von = 0.7 V. Note that Resistor = 15kOhm
The second ...
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"High" current MUXing of 4 HD LRA (AC voice coil) haptic motors
First off, thanks in advance for reading and for any ideas. Please forgive my ignorance on certain things; I'm a new industrial designer with some electronics experience, although I'm not an ...
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How can I recreate a circuit like the WS2812 addressable RGB LEDs without the actual strip?
I've tried googling, youtube, even chatgpt but I'm not quite finding what I need.
Can you point me in the right direction for how to create a custom circuit similar to an addressable RGB LED, where I ...
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ATTiny1616 ADC - issue with input channel switching
I am trying to configure Analog-to-Digital converter in ATTiny1616 to switch its input source between internal voltage reference and external input signal. My issue is that when ADC1 is adequately ...
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How to add multiplexer to my circuit to drive 7 segment display every 10 seconds from 2 different inputs alternately
I've been working on this project and got stuck at a problem in my schematic. I want to display the temperature and the count from the counters alternately every 10 seconds. In other words: display ...
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How to switch between 1024 channels
I have 1024 analogue signals coming in. I eventually need to measure the analogue signal (approx 100Hz) from each source.
I have the following ideas
I could read them sequentially through an ADC ...
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RGB Hub using MUX and PNP
I have 2 RGB controllers that I am trying to connect through a multiplexer that will be controlled from a GPIO pin on microcontroller (Seeed Xiao SAMD21) so I can freely switch between the controllers....
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Protecting multiple MCU digital inputs from high voltage / ESD
I need to design a circuitry with at least 16 inputs used to capture low speed digital input signals (such as buttons with dry-contact). I'm also planning to use a multiplexer/demultiplexer (such as ...
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How to command several devices simultaneously from MCU?
I want to control several devices using one MCU. Each device will receive either 1V or 3V depending on the application. I want to use only 2 analog pins from the MCU to send either 1V or 3V to several ...
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I have three absolute rotary encoders that can output analog sinusoidal voltages OR SSI signals. I need to send their signal to a single pin. How?
The rotary encoders I'm using are sold with several different output options. Analogue sinusoidal (90* phase shifted sin and cosine signal), Incremental output (90* phase shifted quadrature signals ...
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How can I use 1 GPIO output signal to trigger 4 external pins in a staggered manner?
I am looking to send the same signal (for example send HIGH, 3V) from a GPIO pin to 4 receiving devices in a staggered manner; it is important that the signal arrives at different times (short delay).
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Can a 74HC4067 multiplexer be operated with 3.3 V while routing a 5 V signal?
I have a 3.3 V MCU and I'd like to read 16 different digital 5 V signals with a multiplexer whilst minimizing the amount of level-shifting circuitry I need.
Given that the 74HC4067 is an 'analog' ...
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Cheapest way to "isolate" sub-circuits for partial power-down?
My design is extremely power-consumption sensitive, and I need to power parts of design down (using load switches) when they are not in use. I need a way to prevent myself from unintentionally back-...
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