Questions tagged [decoder]

A decoder is an electronic signal processing circuit, which takes as an input a binary number, and turns on a corresponding pin accordingly. It takes `n` inputs (which can all be either on or off) and outputs `2^n` outputs of which exactly one is on

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34 views

Binary Data encoding and decoding format

I am trying to understand what is the meaning of this data coding format as shown in the following image. It is not simple binary to decimal conversion. Can anyone tell how this conversion formula ...
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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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43 views

Decoder inputs needed given 32 registers

I have a couple of questions about decoders. My first is this: If I have a register bank with 32 registers, how many inputs are needed for the decoder and why? I think that you need 5 inputs for this ...
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40 views

Dynamically setting address of HT12E with Raspberry Pi

I have a project where I need to send a wireless signal to one of several receivers to turn on an LED. One transmitter, several (many) receivers, each with an LED. The receivers need to have low ...
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Design decoder with pass transistor

I'm trying to design a \$3*8\$ decoder using pass transistors. I found an implementation with TG on the web (transmission gate) as the following picture, but I can not design one with pass ...
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1answer
39 views

pausing d flip flop output

I want to make a digital timer that counts to 99 minutes 59 seconds the problem is that i want to use 4 digit 7 segment display so i have to oscillate the input of the bcd to 7 segment display between ...
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59 views

Design a circuit that takes a 3 bit binary and makes it (x^2 - x), using a decoder of your choice

i tried making the circuit for each output on its own then make the final circuit but i have a feeling that wrong any thoughts ?
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38 views

Implement decoder using simplified SOP

Implement Z using single 2x4 decoder with 1-enable and active low outputs without logic gate and no complemented literals Z = A'BC'DE + (D'+B)' + BDE My attempt at Simplified SOP ...
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1answer
96 views

How to generate 2's complement of a 3-bit number using 3:8 active low decoder?

This is previous year problem of a competitive exam. I tried by self but i was unable to solve it. Exact wordings of the problem: Generate 2’s complement of a 3-bit number (a2a1a0) using a single ...
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73 views

How do you make a digital counter circuit which counts to 10 minutes and 15 minutes, it will give a signs buzzer? [duplicate]

I asked in this site before, but apperantly I don't quite understand. I want to make a digital counter circuit which it counts to 15 minutes for my big project in my campus . When the circuit counts ...
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88 views

Starting and stopping of a Mod N Counter for a FSM in Logisim

I'm working on a circuit for control logic. I'm using a 3 bit down counter. There is a control signal that when it goes high starts the counter by presetting it with a value of 5. The counter is ...
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1answer
31 views

CD4543B Direct LED Driving Capability

I bought some 7 segment decoders specifically the CD4543B and the datasheet https://www.ti.com/lit/ds/symlink/cd4543b.pdf mentions "Direct LED Driving Capability" Does that mean I do not have to use ...
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68 views

LM567 or Custom bandpass filter

I'm using a array of hydrophones to localize an underwater pinger (37.5 kHz and 45 kHz) and I'm thinking of using LM567 tone decoder as a frequency filter. The other option is to design a custom ...
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78 views

BCD4511 Seven Segment Display Decoder + Diode Matrix

i'm having some issues trying to get a circuit to work that i have found on, yes, the infamous instructables. It consists of a diode matrix that goes to the inputs of a BCD4511 decoder IC. It's ...
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1answer
65 views

how to use decoder and motor drivers to power individual motors at 12V? [closed]

I have a huge set of motors and they need to powered at specific times and at different voltage levels individually. Basic idea that I had, is to use a demux or a decoder to select the motors and then ...
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AD725: is it dot crawl - and what to do about it?

Device's datasheet says One well known distortion of composite video images is called dot crawl. It shows up as a moving dot pattern at the interface between two areas of different color. It is ...
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2answers
105 views

3 to 8 line Decoder not switching off LEDs

I'm currently working with a SN74AHCT138N 3-8 line decoder and the whole point of this circuit is to switch on and switch off a series of LEDs. I connected buttons to the inputs of the IC and LEDs to ...
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1answer
122 views

How to make my own sequence of numbers and letters in a seven segment display circuit? [closed]

In this circuit, I have connected a single switch to a priority encoder, which is then connected to some inverters, further connected to a binary decoder, then to some current limiting resistor which ...
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1answer
41 views

How can I draw the diagram using few decoders for this truth table?

For the truth table above, abc is the input and xyz is the output. I do know how to draw the diagram using a decoder in case of when I have only one output. How can I draw the diagram using a decoder ...
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1answer
237 views

Making a lock system with a 7-segment circuit

I got an assignment in my university to create a lock system using a 7-segment LED, a 7-segment decoder IC and a bi-color LED. The idea of the assignment is that the password is stored somewhere. ...
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2answers
103 views

Old 8 bit decoder behavior

I'm trying to add an USB keyboard to an old 8-bit Amstrad CPC 464 home computer, like is done here. To make a brief summary: The keyboard is designed as a matrix with 10 lines and 8 bits per line, ...
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3answers
162 views

Spurious Ouputs from Nexperia 74HC154 4 to 16 Decoder/Demultiplexer

Problem: Driving 74HC154 Decode with Atmega328 using Arduino software. Decoder Outputs Y0 – Y10 (pins 1 – 11) seem to be picking up signals from each other. The outputs are not random noise. Changing ...
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1answer
736 views

Can I use a 22 microfarad capacitor in place of a 10 microfarad capacitor?

I have a bad 10 microfarad capacitor 400V but can not get a replacement. Can I use 22 microfarads 400V instead?
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64 views

Converting Pulse Sequence Inputs Into Separate Outputs

I'm trying to find the simplest way of accomplishing the following task: Convert 3 different pulse input sequences into one of 3 different output lines The image below explains the problem ...
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1answer
268 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 ...
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2answers
301 views

Building a BCD to 7-segment using 3x8 decoder

So.. I know how to build a BCD to 7-segment using 3x8 decoder but the question provides 4-digit binaries and asks to only input 3 of those.. my question is that won't two different digits be regarded ...
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Combining two schematics of 1kx3 NOR MOS PROM components into a 2kx6 PROM component

Today after class we were left with an exercise of creating schematics and combining two components we learned about today. The exercise is to combine two 1kx3 NOR MOS PROM components into a 2kx6 PROM ...
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2answers
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7 to 128 decoder in Verilog

I'm new to digital electronics and programming in Verilog particularly. I have programmed some basic programs like 2 to 4 decoder, and 4 to 16 decoder. But I am trying to make an image sensor and say ...
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230 views

How to invert the output of 74138 IC?

I have this incomplete circuit. I want to know if there is any other way ,except inverting each decoder's output or making changes in any other IC, to make the desired output be H and the others L?
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682 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. ...
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1answer
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I have miss-sync PAL frames (pictures inside)

In some cases I get this picture: And sometimes I get that picture: analogue camera -> TVP5150AM1 -[external sync discrete VSYNC|HSYNC]-> STM32H7_DCMI I could correct the second picture with offset ...
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2answers
134 views

Why do I Have 800 pixels in PAL video line

I have a DCMI peripheral (STM32H7) that receives video data from TVP5150 with discrete VSYNC/HSYNC. I have 306 (it should be 305, but there is a chance that this is because of the way I count number ...
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1answer
100 views

How can I determine a resolution of 4:2:2 YCbCr image?

I fetch data from 420 TVL camera, and now I just want to see this image, the only thing I need is resolution to draw it on my screen. How can I determine this? BWP M420MD -- camera, I'm getting DCMI ...
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94 views

Reimplement circuit using 1 2x4 decoder and 2 logic gates

I am a Computer Science undergraduate taking a module on Computer Organisation. There is this typical circuit design question that always appear in my assignment and I'm not sure what is the standard ...
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2answers
2k views

Implementing a function using decoder, encoder and some gates

Implement the function F(A,B,C,D,E) = A’B’C’DE’+ABCD’E using only the components required from the ones given below: One 3:8 decoder with active high outputs and an active high enable input One 8:3 ...
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1answer
562 views

PIC - Problem in NEC IR Decoding in PIC12F675

I'm using PIC12F675 with internal OSC running @ 4MHz. I'm using MikroC Pro compiler version 6.6.2. To Decode NEC protocol, I'm not using Timer or Interrupt. I used delay command to make the code as ...
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81 views

SRAM Decoder Size [closed]

What is the typical area taken by address decoder logic in a SRAM? Could someone post area breakdown for each components in a SRAM?
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Why do we need an (adaptive) equalizer when we have a matched filter at the receiver?

When both can perform the same task of reducing the effects of ISI, why use both and not just one at the receiver end?
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1answer
179 views

Internet Radio Device with batteries [closed]

I have an project that I will make connection with Internet and listen a stream(in my case IP:port online radio station) then decode the music and transmit it to speakers connected to the ...
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1answer
68 views

Tail biting Convolution Encoder

I understand how encoder and decoder works but what are theses values ??
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1answer
600 views

CRC hardware implementation

What is the difference between these two implementations as the feedback is in first implementation the last reg only but the second implementation last reg xored with the input bit, so, what is the ...
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3answers
94 views

verilog assign memory in a memory

I want to assign a memory 64x6 in a memory 64x6 by saying that all the 64 rows in memory_2 will be equal to all the 64 rows in memory_1, how to make that in verilog ?? knowing that it is very easy in ...
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2answers
287 views

What kind of serial communication is this?

I am trying to reverse engineer a serial communication between to microcontrollers (1 device & 1 microcontroller on a board). One MCU validates the other MCU and I want to crack the validation and ...
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1answer
2k views

How to implement 8x1 multiplexer using 3x8 decoder and 3-state buffer

Suppose that AB and CD are 2-bit unsigned binary numbers (a) Find the truth table for the function F with 4 inputs A, B, C, D to satisfy the following condition if AB >= CD, then F = 1, otherwise F =...
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119 views

Sampling (reading) a digital data signal?

I'm currently working on a project, where I have an external device (POCSAG pager - POCSAG protocol) that is giving out a digital (5V - 0V) square-wave signal. I have an ATmega2560 (Arduino) ...
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1answer
100 views

inverting address decoder with low after high

I have an 74137 address decoder and know how to build one like that from basic gates. But in my use case the address decoder is connected to the enable pins of a number of bus drivers and I fear this ...
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2answers
98 views

Infinitely expandable binary decoder circuit

I tried to make some binary to decimal decoders, but I had no idea how to build them, so I ended up using the "combination checker" (basically providing one checker for each number). That was really ...
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392 views

How to connect two FPGA boards - VHDL

Hi all, I am trying to figure out a way to connect two fpga boards (like in the image) for a Morse code decoder/encoder. Our first plan was to make the decoding and the encoding in the same board ...
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1answer
525 views

4 to 16 decoder made by two 3 to 8 decoders not working properly

I have a function f(x,y,z,w)=x.y.z+ y’.z’+x’.w’ and I need to make a circuit using two 3 to 8 decoders, an inverter, an or gate with as many inputs as we want (I use two because I need a 9 input one ...
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1answer
414 views

Changing an active low decoder to active high?

I apologize if my question sounds stupid, but I'm a novice and trying to explore all of my options. I currently have a 4/16 decoder, but I did not realize it was active-low and what I really need is ...