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. S

    Baseband Signal Processing and Digital to Analog Converters

    Hi Guys, I have a question on the need for Digital to analog converters in Transmitters. To elaborate bit further: 1) Because of the advantages of the Digital signals, most go the signal processing in wireless communications is performed in baseband. But my question is: Since digital...
  2. nomadreid

    Adobe Digital Editions takeover of pdf files

    Recently I installed the more recent version of Adobe Digital Editions (the new one is 4.5. I had 3.0 -- in fact, I still have also 3.0, as I am not sure whether I can discard 3.0, since 4.5 took over files from 3.0). But then I saw that many of the pdf files on my computer (which were not Adobe...
  3. T

    Understanding Digital-to-Analogue Conversion in Signal Processing

    Homework Statement The digitial signal is transmitted and then converted to an analogue form by the DAC. Using data from Fig. 12.2, draw on the axes of Fig.12.3, the output level of the transmitted analogue signal for time zero to time 1.2 ms. Homework Equations Four bit digital numbers...
  4. Albert1

    MHB Find A in abcd=A(four digital number) is a perfect square ,given ab=2cd+1

    $\overline{abcd}=A$(four digital nmber) is a perfect square ,given $\overline{ab}=2\overline{cd}+1$ find $A=?$
  5. K

    Calibrated Pressure gage (Digital)

    Hello, Can someone tell me what is NIST calibration ? I inquired about a digital pressure gage, the supplier says it is calibrated to catalogue pages but not NIST calibrated. NIST calibration will need longer ETA and higher cost. I am not sure if I really need that since my application doesn't...
  6. B

    Question About Digital Information

    Is digital information that travels across the internet massless? If we were to take out the cables(and maybe the electrons)from the equation, is the digital information taking up physical space?
  7. J

    Given f(N) as digital signal, find f(2N -1)

    Homework Statement f(N) is {3, 4, 5, 6, 7} It starts at 5 meaning f(o) is 5. i have to find f{2N-1} 2. Homework Equations [/B] f(N) is given, so first find f(2N) and then delay by 1. The Attempt at a Solution f(N) is {3, 4, 5, 6, 7} finding f(2N) f(0) is 5. f(2 * 0) is 5 f(-1) is 4. f(2 *...
  8. Eric McMillan

    Curious Digital Audio Electronics Question

    Hello all, perhaps some minds here can help. I am 40 years experienced electronics technician, having specialised in the Audio electronics world in all flavours. I have developed a mixture of materials that can be applied within cable connectors or as an enclosure fitted around electric/audio...
  9. E

    Digital Trainer Board: Get Help Now!

    Hi everyone, I have a project for the semester which I have just concluded. We will be testing the board early next week to see if it works and I am expected to explain how the board works, and I don't really know much about it. Can someone please help? I am currently writing a technical report...
  10. P

    Charging Lipos @ 5C with Digital Power Supply

    I have a ton of 3.7 volt lipo's at my house, each of which can be charged @ 5C, and since each have a capacity of 270 mAH, than I should easily be able to charge them @ 1amp. I put 8 in parralel with each other so it is a 1s, 8p battery pack. each of the lipos is the same (in tems of specs, ik...
  11. Andy Resnick

    Insights Digital Camera Buyer's Guide: Tripods - Comments

    Andy Resnick submitted a new PF Insights post Digital Camera Buyer's Guide: Tripods Continue reading the Original PF Insights Post.
  12. kolleamm

    Where can I find a digital counter for turns?

    I have a winding machine that needs a counter to count it's turns, subtract backwards also. I did a search but most results were fairly expensive and bulky. Any help is appreciated. Thanks in advance
  13. Andy Resnick

    Insights Digital Camera Buyer's Guide: DSLR - Comments

    Andy Resnick submitted a new PF Insights post Digital Camera Buyer's Guide: DSLR Continue reading the Original PF Insights Post.
  14. R

    Digital Logic 4-bit Multiplier/Adder

    Homework Statement Build a circuit that either adds or multiplies two 4-bit numbers based on a control input C(C is 1 add, C is zero multiply). Numbers are positive and negative so use two's complement. You can use muxes, Full Adder Circuits, and logic gates Homework Equations Multiplier...
  15. Avatrin

    Digital signal processing and the z-transform

    Hi I am currently learning Digital Signal Processing from Applied Digital Signal Processing by Manolakis and Ingle. However, my background is in mathematics, so I like being shown why an assertion is true. So, in the chapter about the z-transform is where I start seeing this becoming an issue...
  16. Andy Resnick

    Insights Digital Camera Buyer's Guide: Real Cameras - Comments

    Andy Resnick submitted a new PF Insights post Digital Camera Buyer's Guide: Real Cameras Continue reading the Original PF Insights Post.
  17. Andy Resnick

    Insights Digital Camera Buyer's Guide: Compact Point and Shoot - Comments

    Andy Resnick submitted a new PF Insights post Digital Camera Buyer's Guide: Compact Point and Shoot Continue reading the Original PF Insights Post.
  18. GregoryC

    I Analog vs Digital: How Digital Representations Reflect the Analog Universe

    What makes us believe we can represent an analog universe with digital representations? We can only know the radius of a circle or it's circumference with precision because Pi is an approximation.
  19. A

    Digital application for a duty rota

    I am interested to know whether there is an application to make a duty rota for employees. The application should allow all employee to select their preferred days, even shifts within the day, and the result will be the one that makes the best match to their initial choices. Of course, there...
  20. M

    20 kOhms/V meter versus Digital meter in valve circuits

    Hi All... I'm in the process of restoring an old Eddystone 730-1a receiver (all valves for you younger folk) and the service manual gives the test point voltages based on a 20k/Volt meter. I realize that some, if not all of these voltages are relative to a high impedance source and the 20k/V...
  21. A

    Digital Force Meter: Is It Worthwhile for a Summer Project?

    hey, i am a sophomore engineering student and i was looking to make a project this summer, for some extra credit, so i had in mind a device that measures force in certain situations, as an example if we have a machine ( with pulleys and machines) with 2 sides, one side is where the force is...
  22. T

    Digital Multimeters with a PC interface (recommendations)

    Any recommendations on multimeters that have a decent PC UI that can graph your data from the multimeter? Budget around $250 which is on the lower end but any recommendations are appreciated.
  23. SuperDaniel

    Digital Control Systems Textbook

    Hi Guys, I need some material to update, or, better said, to reinforce my skills in Digital Control Systems. In the very beginning I thought on "Digital Control Systems by Benjamin C. Kuo", but, after think about this, I realized that, maybe, this is an oldie for this subject. Do you have any...
  24. E

    What is digital bandwidth finder

    Hello, I was watching this video 07:37 there is instrument called digital bandwidth finder written on it. what it do? There is standard dish and High definition dish. will coaxial wire used with LNB and feed horn are same for both broadcasting?
  25. C

    Camera which measures distance?

    Hi all, I'm having trouble finding something online which isn't a very complicated device, but I don't know if it has a specific name, which would help me in a google search. I have a motor in an MBE which moves the sample, and I need a camera which can read to a computer what the distance is...
  26. J

    Digital Logic Help: Understanding Q1+ and Q0+ from a Truth Table

    I cannot figure out where the values from Q1+ and Q0+ are coming from. What truth table are these coming from?? I would greatly appreciate any help. Thank you.
  27. D

    Understanding Digital Logic Latches: RS, Gated, D Latch Timing Explained

    Homework Statement So we've started digital logic in lectures and don't seem to understand some things about it. I've searched online but nobody seems to have explained some things. RS LATCH GATED LATCH D LATCH TIMING Q1: Does LATCH response(as in truth tables) just mean that nothing...
  28. N

    How to Operate a CIMARK Digital Microscope with a 26pin Jack?

    Hello everyone, I would like to ask if anyone has ever know about this one. I have no idea how to make it run. The jack on top of it is 26pin inside but the cable is 26pin plus 2 more very black wire welding on each side of the Jack. I remove the Lense i see the small camera with name is CIMARK...
  29. Geek007

    What is baseline wandering in digital transmission?

    hi there, can someone please explain what is baseline wandering and how the continues 1's and 0's cause baseline wandering in digital transmission? Regards
  30. ramzerimar

    Digital Systems class for a MechE

    Hey people, I need some help, preferably from the Electrical Engineers... Classes start next month and I'm stuck deciding some electives to take during my third mechanical engineering semester. Here's the thing: I decided to take some electives from the EE department so I have a good basis to...
  31. Guidestone

    Can you please tell me the name of this component?

    Hey guys, I don't know if this question is supposed to be in the homework questions section, If it is then I'm sorry. I just want to know the name of this component (the one inside the red box). It looks like a flip flop, I'm not sure. I just haven't been able to find it on the internet and I...
  32. TomLund

    Removing a Varying DC Offset from a Digital Signal

    I am currently ‎building a simple visible light communication project. ‎ My issue is with the ambient light in the room. The Vout of my photo diode amplification circuit shows a square wave carrying the data on top of a varying DC level depending on the amount of ambient light . ‎ I have read...
  33. I

    Odd voltage reading from digital volt meter

    I have a three phase alternator and I used a digital voltage meter across the output terminal and the reading went from OL to 4000 volts to 3000 volts and quickly decreased to zero volts, then went through the range again starting from OL. It continued to do this, I thought the meter could have...
  34. B

    Microphone (Analog) to Ethernet (Digital) to Speaker (Analog) system

    Hi, I would really like to make a system who takes a Microfone(Analog signal) convert it to a Ethernet(Digital signal) and in the end convert it back to Speaker(Analog signal). How would be the best way to do this? I have thought about using a raspberry pi or a micro controller. But do anyone...
  35. H

    Amazon's Last Resort: Shopping for Books in the Digital Age

    I saw a $75 textbook on Amazon that I wanted. But every book I've bought from Amazon has been so badly made that I consider this a last resort. While wondering what to do, I came across this. "First a rant: What has happened to the once high art of bookbinding? I have hardcover books, with...
  36. Sergiy

    Building a digital VHR AM Aircraft receiver

    This is a continuation of the archived thread from https://www.physicsforums.com/threads/how-to-make-inductor-coils.570700/. Judging by the list of needed coils, I suspect the author was looking to build VHR AM Aircraft Receiver as described here...
  37. srinaath

    Digital scroll vs inverter driven scroll compressor?

    hi guys...am not that versed in thermal engineering...am learining different VRF(variable refrigerant flow) systems...is there is fight between digital scroll vs inverter driven scroll compressor...then who will win? in terms of efficiency (EER/ and IPLV), modulating capacity...
  38. B

    How does a Digital Multimeter work?

    Can someone kindly explain the exact working of a digital multimeter? I know the basic idea, that everything measured (current, resistance, etc..) is converted to volts. But what happens after? How does the digital part come into this? Thanks in advance.
  39. Nahian

    Design Even Number Generator with 4 Bit Counter

    how can i design an even number generator with a 4 bit counter without using any flip-flop , Using only 4 bit counter?
  40. O

    Digital logic excitation equation from state diagram?

    Homework Statement Design serial transmitter circuit take 8-bit word in parallel as input, when an input control signal (SEND) goes high, and serially outputs the word (i.e., one bit during each clock cycle) to a single transmission line. Transmission of a word begins with the least...
  41. S

    Designing House Wiring: A Guide & Digital Diagram App

    I want guideline to design house wiring. Also need an application by which the design diagram can be digitized.
  42. O

    Understanding State Machines: Converting Logic Problems into K Maps

    So I was reading my book and I came across a table, I don't understand how they converted the problem into a table. They're designing a sequential logic machine and it looks like they made a K map of something, but I don't know what they used. Can anyone explain how the book did this...
  43. Serhatee

    How can I deactivate the shutter button?

    Hey guys, as a freshman, I want to deactivate this shutter button. I don't know how it works and its structure. I want to be able to connect two cables so that by giving current, I can take a photo. Which terminals should I use? Or different ways...
  44. ericdmurphy

    Positive and Negative Adjustable Current Supply (3.3mA)

    Hello, I was looking for some sort of chip/IC that would accept a digital input of say 4-5 bits and that would adjust an output current. I am looking to have a +/-3.3mA current applied to a resistive load. It would also be helpfull (for testing purposes) if I could adjust the inputs so that I...
  45. rizwanibn

    Understanding Sampling Period 'T' in Digital Control Systems: Tips and Tricks

    < Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > Hi. Please see question no. 1 in the attachment. If i take the inverse Laplace transform or the Z transform, how can i actually get the value of sampling period 'T'. or is there any other way...
  46. R

    Digital camera flash question

    I've noticed that when somebody takes a photo of me with a modern digital camera, I experience not one flash but two. Are there really two flashes for some reason or is it a perception thing?
  47. S

    Realism of modern digital special effects

    Do you find modern digital special effects convincing and realistic? Will they look outdated 20 years from now? Perhaps I see some digital special effects and don't realize they are digital. However, big digital landscapes and architecture (e.g. "Bladerunner" or the "Indiana Jones..." series...
  48. S

    Engineering Digital or Analog IC for a person with digital bias

    Hi PF, I can't decide which path I should go down in terms of my focus. I really love digital hardware from FPGAs to doing IC layouts, I also enjoy the trade-offs involved in making a computer architecture. I also like analog circuits with things like mosfets and opamps. I think it would be...
  49. Ranger Mike

    Do digital linear scales stretch?

    Hello friends, i hope this is correct forum. If digital linear scale with a resolution of 0.1 micron is attached to a very flat piece of aluminum, at 68 degrees F, and is calibrated with a laser interferometer, and is then exposed to a slow increase of temperature to 100 degrees F, then...
  50. ranju

    Error Analysis of Op-Amp Output with Tolerances on Inputs and Resistors

    Homework Statement The input bits 0 and 1 are represented by 0 volts and 5 volts respectively. The OP-AMP is ideal, but all the resistances and the 5 volts inputs have a tolerance o f ± 10%. The specification (rounded to the nearest multiple of 5%) for the tolerance of the DAC is?? In this...
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