What is Digital: Definition and 491 Discussions

Digital electronics is a field of electronics involving the study of digital signals and the engineering of devices that use or produce them. This is in contrast to analog electronics and analog signals.
Digital electronic circuits are usually made from large assemblies of logic gates, often packaged in integrated circuits. Complex devices may have simple electronic representations of Boolean logic functions.

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  1. N

    Digital to Analog converter concept problem

    Homework Statement Hello PF :smile: i am stuck with a concept of weighted resistor D/A converter. For a 4-bit resistive ladder, VA={V0/R0+V1/(R0/2)+V2/(R0/4)+V3/(R0/8)}/{1/R0+1/(R0/2)+1/(R0/4)+1/(R0/8)} I want to find out how the equation is derived but have no clue. Thanks.
  2. W

    Understanding Active High Circuits and Digital Logic: A Beginner's Guide

    I've recently started a digital electronics course with a lab component (so far not at all related to the lectures). Unfortunately, there are no prerequisites for the course and I guess they somehow expect us to know a whole lot about circuits, but I'm completely confused. I"ll just ask two...
  3. sophiecentaur

    Digital Oscilloscope Purchase Thoughts

    I am totally fed up with not having had the use of an oscilloscope for many years. It has been very frustrating on so many occasions. I need one. So, my options are (and I only want to spend minimal cash, of course): An ancient eBay analogue scope for something around £100, a PC based one or a...
  4. F

    Powering Digital Circuitry From SMPS

    I was thinking of powering a microcontroller directly from a buck-boost converter, but after doing a few calculations I ran into the following problems: Ringing when switching on/off Current rise time You can get the ringing down with a snubber. The current rise time however is a big...
  5. M

    Method for checking if digital data is transmitted accurately?

    In this experiment, we recorded a person saying "Aaaaaaa" on the mic as the analog source. And then the analog data was converted into digital data so that the programme in the PC could read it and then the digital data was converted into Analog again to reproduce the recorded voice. I attached...
  6. J

    Digital signal processing - conjugate reciprocal of a complex number

    Digital signal processing -- conjugate reciprocal of a complex number what is the difference between conjugate of a complex number and conjugate reciprocal of a complex number i am asking with reference to z transform...Thanyou
  7. G

    In Digital communication world

    What is the relation between the Energy (E), power (P) and transmission rate (R)?
  8. Chronos

    Calculating Mass Density of the Universe with SDSS DR10 Quasar Catalog

    The latest quasar catalog, SDSS DR10, has been released - http://arxiv.org/abs/1311.4870! Yes, I know, you can hardly contain your excitement.
  9. M

    Digital Watt Meter Connected To Microcontroller

    Hello all, I am currently working on a project for a client in which my objective is to create an educational light bulb display. The purpose of this display is to demonstrate cost effectiveness between 4 different bulbs (incandescent, high-efficiency incandescent, CFC, and LED). Each...
  10. M

    Practical digital current regulator

    Consider a DC motor, being switched by a H bridge that is controlled by a PI current regulator. As long as the error (SetCurrent-Current) is positive everything is good. However, when this goes negative we have a problem as you couldn't set a negative duty cycle. How is this solved in...
  11. J

    Is there a wavelength shift in the way digital cameras represent color

    After going on a ghost tour over Halloween, several people were able to take photos of ghosts seen through an old hotel window, a few stories above our position. This got me to wonder if this was a trick that relied on the way that the digital cameras may be able to detect non-visible...
  12. F

    Engineering Basic Digital Circuit Problem

    Homework Statement You are to design a circuit that calculates Hamming distance between two 5-bit numbers. It takes two 5-bit binary numbers A4A3A2A1A0 and B4B3B2B1B0 as inputs and reurns the number of bits that are different between the two numbers as binary output O2O1O0. For example...
  13. J

    Digital Image Processing, Phase offset

    Homework Statement I'm working on a Matlab problem for a digital image processing class. The problem is to take an image, then take its 2D-FFT and offset the phase component by pi. Then to take the IFFT of the new DFT using the unmodified magnitude and modified phase. What I got was a...
  14. E

    Digital or Analog Signal Inversion

    I would like to take an incoming signal (digital or analog), invert it, and send it to an antenna. What is a simple high-level approach to this?
  15. S

    Digital Color Organ Build Help

    Hello everyone, I recently posted about making a color organ, in which I was going to use a circuit to process analog signals. Since then, I have decided to move in a new direction of a digital color organ. I would really appreciate if someone with more experience than me could give some...
  16. zoobyshoe

    Which Digital Camera Sensor Size Should I Choose for Sharper Pictures?

    I'm confused about this. I'm looking at two point and shoot cameras. One is 10MP and has a sensor of 1/1.7. The other is 12MP and has a sensor of 1/2.3. According to this wiki article: http://en.wikipedia.org/wiki/Image_sensor_format, the 1/1.7 sensor is physically larger than the...
  17. A

    120-240VAC Digital Logic Power Relay Timer

    Design Goal: Remove power from 4 washing machines and 4 dryers using relays and a digital logic timer. (9 Hour cycle of no-power from 22:00 to 07:00 the next day) Design Problem: What relays can I use that can be actuated by logic voltages? Should I use 2 relays, a logic relay that actuates a...
  18. S

    Digital Design - decoders and multiplexer help

    Homework Statement Let f(x3; x2; x1; x0) = (y1; y0) such that y1 = 1 if the number of 1's in x3x2x1x0 is even, 0 otherwise, and, output y0 = 1 if the number of 1's in x3x2x1x0 is odd, 0 otherwise. 1. Implement f with four 2-to-4 decoders. 2. Implement f with a 4-to-1 multiplexer with selection...
  19. E

    Understanding Analog-to-Digital Conversion for Digital Computing and Processing

    Right now I am a computer engineer. I really love digital and want to focus on it because it uses logic. Analog is a bit more complex in that signals are not only 1 or 0, but sampled with many values. Anyways, I took digital logic and design courses, but I am unsure if i should take any...
  20. shreyakmath

    Creating Digital dna that works just like its real counterpart

    Hello. Regards to all. I am working on an Organism Simulation Framework to simulate virtual organisms on low cost computers. I have already developed an alpha version of the project. To see the project, visit: www.sourceforge.net/projects/livmach Now I am in the phase where I require...
  21. Redbelly98

    Entertaining review of digital storage oscilloscope

    I'm thinking of buying this nice DSO for under 1k $US for home use. It's the 70 MHz model in the Rigol DS2000 series. But that's not why I'm posting. I wanted to share these video reviews of the scope which are a real hoot -- provided you have spent a lot of your time using oscilloscopes...
  22. J

    Digital filter response question

    Homework Statement A digital filter is defined by yn = xn - n-2 - 0.81*yn-2. At what frequency, in terms of fNyquist, is the filter response zero and maximum? Homework Equations H(z) = Y(z)/X(z) The Attempt at a Solution I figured out that H(z) = [z2-1] /[z2 +0.81] and...
  23. X

    Digital Clock Project w/ 7490 IC - Strange Problem

    Hello! So my current project is to make a digital clock using primarily the 7490 IC. Which, (to those not familiar) is just a decade counter that outputs a 4 bit binary number. I am having a very strange problem. I made a video that explains everything. (Since it just seemed easier to...
  24. P

    Can you design digital multisim components?

    Hi guys, Just wondering if there Is a way in multisim to design your own components from scratch? basically starting with the input and output pins and you fill in the gate logic on the inside. Im designing an old school binary-BCD for 12 bits. I've got the theory all figured out, and I...
  25. J

    Finding sampling frequency for analog to digital conversion

    The input signal to an analog to digital converter is x(t) = 5.4 cos (134.5πt + 0.1π). The output from the converter is y(n) = 5.4 cos (0.47πn - 0.1π). Compute the sampling frequency (samples per second) of the analog to digital converter. Hint: the continuous-time input signal is...
  26. Y

    How to convert the new digital on air signal for old tv system?

    I always record all my tv programs and watch it in much later time. I am actually like a year and half behind the current schedules ( I just started the 2011-2012 season!). The advantages are I can skip commercials and the most important thing, I can watch the coat hanger season finale and...
  27. J

    Cat 5 Digital Audio: Transmit/Receive 12 Channels @ 48KHz

    Hey guys I'm hoping someone can point me in the right direction here. My goal is to receive 12 and transmit 4 channels of 24 bit audio @ 48KHz over 100ft to 300ft. I would guess that at this distance I need differential signals. The Cat 5 cable would then have the following twisted pairs...
  28. E

    Exploring the Inner Workings of a Digital Watch

    Is there any serious work with calculations and explanations about this topic? Any references? I know that that digital watch is a combination of physics(piezoelectric effect) and logic, but i need to know much more.
  29. M

    Tektronix CMD-80 Digital Radiocommunication

    Hi everyone. Was wondering if anyone can tell me if this piece of equipment can be used as a spectrum analyzer? I haven't found much in the way of capabilities in a PDF or whatever. Thought maybe you guys would have a better idea...
  30. H

    Digital Circuits and Best Suited MOSFET for 3.3V

    Hello everyone, I wanted to make some digital circuits with discrete CMOS components but I do not know how to read these MOSFET datasheets properly and I have no idea which models are good for these kinds of projects (for a 3.3V as Vdd and with ground). I know the characteristics of MOSFETs...
  31. trollcast

    Digital Security: Pay, Prospects, & Trends

    How big / employable is the field for digital security at the minute and what's the sort of trend for the future looking like? Is the pay similar or above / below average to most other computer science / engineering jobs? Its just that the security modules are one of the main differences...
  32. C

    What do you think of digital information being able to be stored in DNA

    Hi this is my first post so i hope its ok :). I was wondering what are others opinions on this ? ? THIS IS THE LINK LOOK AT THIS WONDERFUL LINK Have you ever wanted to be a human usb ? ? Personally i don't see where this could go if they were able to start storing large...
  33. M

    Theory of BiQuad Antenna Design (now a digital TV channel question)

    Hi everyone, I'm Designing a BiQuad antenna for WiFi applications. The design and optimization are relatively simple but i need some references of the theory behind this antenna. I'm reading some theory of Bi-Conic Antennas but it's a bit difficult to extrapolate the idea between both...
  34. P

    Is a Digital Circuit the Same as a Logic Circuit?

    Basically, is a digital circuit the same as a logic circuit? I.e. Is a logic circuit another name for a digital circuit because am i right in thinking that all digital circuits are a set of logic functions e.g. Logic gates which follow the rules of boolean algebra?
  35. Rob D

    Matter: Digital or Analog? Exploring the Perceptions and Models of the Universe

    I am vexed. In your expert opinion can matter and the particles and wave forms of which it is composed be described within a digital model or an analog. Is this a human perception limitation wherein the analytical left hemisphere types prefer a digital universe mostly because it can be...
  36. T

    Digital Filter Equivalence in a difference equation form

    Homework Statement Find the digital filter equivalence of the circuit in a difference equation formHomework Equations Is this the difference equation form?The Attempt at a Solution If that is the proper form.. I think this is how to solve it? I got this example from my textbook I'm just not...
  37. F

    Purpose of 220Ω Resistor in Digital Input Circuit - Dan

    Please see attached schematic. Basically the diagram shows a single channel of a 32-channel digital input card for an industrial controller. My diagram represents this configuration with the 24V supply externally sourced to terminals 65 & 66. The question is what is the purpose of the...
  38. C

    Best digital notetaking and digital education device?

    Best digital notetaking and digital education device?? Hi, I'm looking for some digital device that allows me to take notes/make drawings, and adding audio or video to some of the explanations (Just like Khan academy) what would my best options?? I have been looking at the boogie boar, but...
  39. G

    Simple digital Bandpass Filter confusions

    Lets assume I have a signal that exists in time and it has an unit impulse at t=5, I only want to filter out that portion of the signal. So I plan to design a passband filter to filter the signal out at t=5. This is where I get confused, my passband filter exist in frequency so how is that...
  40. R

    I using my digital multimeter

    Hi, this might seem like a really stupid question, but I am not sure how the scale works on my digital multimeter. I am trying to measure the resistance across a photocell in the light and in the dark. I was given this digital multimeter as a gift, but am unsure how to use it. The...
  41. U

    Digital to Analog conversion

    Hello Everyone, In Digital to Analog conversion circuit we use the weighted resistors(i.e R,2R,3R,4R) and one feedback resistor(i.e Rf). Here my question is that how to calculate the those resistor values? If you know any formulas please provide me...
  42. T

    Engineering Need Help Identify Digital Logic Circuit

    Homework Statement On the data sheet, name the device in Figure 9, and appropriately name the four pins A, B, C, and D according to what the device is. Check your Digital Logic book for some guidance...
  43. C

    Digital Line Topology: Show Odd Integers are Dense in \mathbb{Z}

    Homework Statement Show that the set of odd integers is dense in the digital line topology on \mathbb{Z} The Attempt at a Solution if m in Z is odd then it gets mapped to the set {m}=> open . So is the digital line topology just the integers. If I was given any 2 integers I could...
  44. A

    Introduction to digital logic design Video Lectures

    Hi, Can anybody recommend me a good video lecture series on Introduction to digital logic design? I want to watch these videos before going to class.
  45. R

    Medical Digital dental x-ray with periapical film

    It is said that digital dental x-ray has less radiation. Is it because the sensor used that acts faster in capturing the image. What if you use a traditional film on a digital dental x-ray. Would the radiation be the same?
  46. E

    Research study on Digital Delay/Pulse Generators

    Hello everyone, I am doing a little bit of research on Digital Delay and Pulse Generators, and I would like to ask a question to anyone who works with that kind of equipment. How do you choose a DD/PG? The main criterion I guess should be it's function (DD/PG models are normally very...
  47. E

    Question for experienced - digital communication books

    question for experienced -- digital communication books i want name of book for digital communication useful and simple way to present contents that i can study by my self thanks in advance
  48. A

    Generating A Noise Signal from a Digital Processor

    Hey guys, If I wanted to go about generating just a plain noise signal (don't care what the signal consist of), at a certain frequency (say 10 MHz) what is the best way to go about doing that? If possible I would really like to use a microprocessor or ARM processor (due to the higher...
  49. B

    Question about digital broadcasting

    Is the DVB-T broadcasting standard exactly the same as the DVB-C broadcasting standard?
  50. B

    Question about wireless digital signaling

    Is it possible to send a digital square-wave signal directly to a wireless transmitter without converting the signal into a continuous format such as the phase shift keying used in WiFi?
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