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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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How to short two nodes electronically

I am using a Phillips SAA3010 IR transmitter IC to send a modulated IR signal. The IC has two types of inputs: Z0---Z3 X0---X7 And one type of output: DR0---DR7 Each legal operation corresponds to ...
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Arduino Piezo Knock Sensor Synth

I would like to create a synthesizer using 20 separate piezos for the triggers. In other words, each piezo would trigger a separate tone. At the very least I would like to know if connecting 20 ...
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2answers
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Simple solution for driving a large-ish RGB LED array with PWM

I'm working on a small toy-like device that has a 10 x 8 "pixel" array of RGB LEDs at its core; thus there are 10 x 8 x 3 = 240 individual LEDs to be controlled. I'd like to control the intensity of ...
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2answers
787 views

Multiplexers/Demultiplexers

I have a circuit where i have 4 binary numbers, they are all stored in D FlipFlops. I want to be able to pull out one of those numbers based on an "index" number. The index number would be a 2 bit ...
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Design an AND gate using 2:1 multiplexor

I just started my computer architecture course and I'm trying to figure out universal logic, using multiplexors to represent logic blocks. I found this one example how to use a 2:1 multiplexor to ...
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Controlling more relays than the no. of free IO pins a uC has - Low-cost options

While I understand that moving up to a high pin-count uC might be the simplest option, I am looking for Low-cost options to do the same with low pin-count uC. Would like to control a maximum of 8 ...
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Why don't these multiplexers work?

I have an Ardunio controlling two CD74HC4051 muxes. The com terminals of both are connected, so I'm basically using the first mux to select a input, and passing the ...
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2answers
295 views

Larger multiplexers?

I ordered a few of these! , turns out they are a lot smaller then I planned (they are the size of a small ant). I was wondering if anyone knew where,if, I can find larger, preferably dime sized ...
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Multiplexed Thermocouple Considerations

I have a side-project to read temperatures from 4 thermocouples (K type, around 500F for coffee roaster data logger), and no previous analog experience at these levels. I've identified two possible ...
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1answer
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Boolean majority function

In this picture is an example of a boolean majority function (may be a bad example) So the rule says that the result or an output of a majority logic function would be a selection of majority inputs, ...
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3answers
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74HC595 +TLC5940 multiplexing 128 leds -> not enough power

Apologies in advance for probably missing a lot of things. I'm pretty new to electronics. I'm building a 128 led (monochrome) multiplexed array, driven by an Arduino. I'm using a 74HC595 as the ...
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5answers
2k views

How multiple data transmission (in the form electrical signals) work?

I am studying data communication and networking. While reading about data transfer using electrical signals, I came across 'frequency division multiplexing'. I understood how data is transferred in ...
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2answers
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Does analog time division demultiplexing need any additional sample and hold?

Quick general summary: In analog time division multiplexing, after combining several continuous signals into a single line, do you generally need to use some form of sample and hold to reconstruct ...
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How can I construct an 8 x 1 multiplexer from two 4 x 1 multiplexers with enable inputs?

I've thought about this problem for two days, and I can't figure out the trick. It would be easy with an inverter and an OR gate, but I was told not to use anything but muxes and wires. I figured out ...
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2answers
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How does an 8-4 multiplexer function?

I understand the concept of a multiplexer and I can understand how n-1 multiplexers function. Your just sending a select signal to tell the multiplexer which of the inputs at the input pins to let ...
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2answers
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Linking two 4511's to drive two independent seven digits displays

I kind of remember to had linked two seven digits displays. using a single 7 bits output with two 4511's linked together, but can't find nothing about that in Internet. The only way I had found is ...
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2answers
396 views

Extending UM91214B to support more channels

In this circuit's description, It is given that we can extend the circuit easily to generate up to 12 DTMF signals. How can that be done?
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Large Multiplexers/Data Selectors

I'm looking for a multiplexer IC with 128:1 or more inputs (256 would be quite nice). I would have thought such a device would be quite common yet I'm having a tough time locating it. It could be that ...
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5answers
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How a 2-1 multiplexer (MUX) work?

I haven't done EE for quite a long time. I need to implement some MUX, so I started with a two-way MUX. But I don't understand how to make the decision: Wiki- Multiplexer A truth table will show ...
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3answers
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Design of Wiring Harness Tester for Automobiles

I've been given a task to design a wiring harness tester for automobiles. The tester's job is to test wiring harnesses which can contain upto 300 wires. My initial design was quite simple. Feed the ...
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1answer
225 views

Looking for device that help me split a n bit input bus, or n analog lines into two or more bus at output

I looking for device that help me split a n bit input bus, or n analog lines into two or more bus at output Please consideration concept diagram below. At input there is n bit input bus, or n analog ...
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5answers
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Board layout help: 64-output Mux! (for possible use in 8x8x8 LED Cube)

So just for practice I decided to design a 64-output mux in Eagle, I figured if its good it could be useful in the future. I did not use auto-router. Here is the PCB: (Click to zoom in) To the ...
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6answers
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Irrigation Valve (24VAC Solenoid) Multiplexing

I have a fairly extensive sprinkler system in which I have used all of the available wires. I've added new landscaping that requires irrigation, but without available wires to use for the valve ...
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Is it possible to drive 4 seven segment display with MSP430G2231?

I'm trying to teach myself electronics and my goal is to create a digital clock with 4 digits. I have an MSP430G2231 which has only 8 available ports as far as I can tell. I saw some methods for ...
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6answers
851 views

Controlling 5000 LED

I'm doing a project where it requires to control 10,000 I/O. 5000 output - For 5000 LED, where only 1 LED will be light up at one time 5000 input - For 5000 sensor, where it'll sense the presence of ...
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3answers
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Multiplexing LEDS and Multiple Output Pins

Ok.....i've been trying to understand something (and trust me, to most people it's a VERY newbish question) So I see people all the time "multiplexing" LEDS. using just a few Pins. Lets say for an ...
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1answer
9k views

How to create an n-bit multiplexer?

I'm needing to create a 4 bit, 16 input multiplexer. I know I could describe this as a long list of S => when "0000" etc.. but I think that's not very clean, and ...
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4answers
511 views

High voltage high bandwidth analog mux

Does anyone know some ref of high voltage high bandwidth analog multiplexer? I am looking for a mux that can tolerate input voltages up to 10V, but has also a high bandwidth of at least 1Ghz. I am not ...
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6answers
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How can I control many LEDs with just a few pins on my micro?

I am using an Atmel ATtiny13 which has a 6-pin I/O. I'd like to control about 15 LEDs but am unsure how to connect everything. Without multiplexing of any sort, it seems I'd only be able to control 6 ...
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1answer
542 views

multiplexer and demultiplexer ic

Is there a single IC that has both multiplexer and demultiplexer functions?
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2answers
2k views

Methods to drive a multiplexed LCD with logic-level signals?

I've used such a technique in a couple of the products I've designed, but I've never seen anyone else do so. It's possible to drive a 3-way multiplexed LCD using a bunch of 74HC595's to generate an 8-...
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3answers
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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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605 views

Deciphering Mux/Demux/Switch Nomenclature: AxB:C?

I'm looking through Digikey's Interface - Switches, Multiplexers, Demultiplexers section (and, thanks to W5VO, the Logic - Signal Switches, Multiplexers, Decoders section as well), and I'm having ...
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1answer
316 views

slick way of muxing power+NTSC video over RG59/RG136?

I've got a few NTSC security cameras I'd like to set up around the perimeter of the house. They output standard NTSC video and require 12V for power. I was hoping to power them and take video off the ...
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2answers
284 views

Why is my code running so slow?

Hey guys. I'm building a 9 RGB LED chaser, using an ATTiny2313 to drive it. The cathodes are connected to all of PORTB and pin 6 of PORTD. I wrote some code to drive them all, but for some reason it's ...
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7answers
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How can I control 128 (or more) solenoids?

I need to switch 128 solenoids either on or off individually, several times a second. I'd like to drive this from either a PC, or an embedded device. How would you recommend I do this? Perhaps ...
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9answers
2k views

Serial control of 25 LEDs from a single pin

I have a microcontroller with one available digital pin. How can I control 25 LEDs?
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3answers
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Use of tristates vs multiplexers in a RAM

Why are tristates favored over multiplexers to select the output from RAM? The explanation that I've heard of is that the RAM is too large for using a multiplexer but I need more details. A theory we'...
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4answers
2k views

Any ideas on how to implement a USB man in the middle circuit?

I'm looking for an easy way to get in between of a HID USB communication. Can it work by multiplexing a single usb port on an AVR? Thanks!
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2answers
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Is Multiplexing ever superior to Charlieplexing?

I've reviewed the two methods, and multiplexing really only appears to have one advantage, that it would be easier to track down a failed LED than in a Charlieplex array. Can someone more ...
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4answers
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What to use for the high-side (anode) drivers of a common anode LED matrix?

I'd like to multiplex rows of LEDs with a constant current sink driver. Should I just use BJTs to switch current into the rows of anodes, or is it better to use FETs, an array of FETs, or the same ...
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1answer
1k views

Using Multiplexer with an Arduino

I am trying to get a Multiplexer to work with the Arduino. Description at sparkfun Datasheet I thought the wiring was pretty simple and as a basic test, I have AREF connected to C1(multiplexer) and a ...
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15answers
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Controlling 500 LEDs with PWM

I'm considering taking on a project that would involve individually addressing 500 LEDs, optimally with PWM support for each. I'm planning on using an Arduino since I already have one, but I'm open ...