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. B

    What type of digital signaling is more efficient, digital DC or digital AC?

    What type of digital signaling is more efficient, digital DC or digital AC? With digital DC, the square-wave signal is only between a (+) value and 0. With digital AC, the square-wave signal is between a (+) & (-) value.
  2. W

    ICL 7107 digital voltmeter helps needed

    I'm building ICL 7107 digital voltmeter with 200mV full scale as Figure 12 (page 11) on http://www.intersil.com/data/fn/fn3082.pdf. Here is the problem I'm facing: it shows random numbers, sometimes showing 1666, and it has no effects even when I try to calibrate by adjusting the...
  3. E

    MATLAB Video capture from digital data using MATLAB

    I am working on one project. In which I have CCD image sensor (Sony's ICX254AL ) and its output is connected to Analog Front End (TI's VSP2562). The output of Analog Front End (AFE) is 12 Bit Digital data at the rate of 9 MHz. I am thinking to use NI's PCIe 6535 as a data acquisition device to...
  4. C

    Is there a way to make learning physics in the digital age more engaging?

    Hello World! I am going to college to do physics this year, and there is a issue I have. I have a pretty logical, critical thinking, creative, investigative mind and pretty good imagination of the possibilities that reality can hold. I love how science works and how it helps us to understand...
  5. R

    Difference between analog and digital interface

    I am working with two distance sensors 2d120(analog output), 2y0a21(digital output). In those two datasheets, they had written that 2d120(analog) requires analog interface and 2y0a21(digital) requires digital interface. Currently, i am using only 2y0a21(digital output) sensor in my project work...
  6. D

    Digital modulation and RF bandwidth

    Why isn't it possible to invent a custom digital modulation scheme that would use much less RF bandwidth than all the schemes available? What are the limiting factors that do not allow for high data rates to be coded so that the occupied bandwidth is much less than all the others like ASK, PSK...
  7. I

    Hi guy i have a question regarding digital fundamentals plss help ))

    hi guy i have a question regarding digital fundamentals plss help:))) Show how ONE XOR gate can be replaced by THREE 2-input logic gates.You are allowed to use any logic gate except XOR and XNOR logic gates...anybody can solve this?:))
  8. T

    Engineering Optimizing Digital Circuits with DeMorgan's Theorem and Boolean Algebra

    Homework Statement 1. (a) Remove all the internal bubbles in the circuit by applying DeMorgan's theorem so that the circuit consists of only AND gates and OR gates, and INVERTERS. INVERTERS can only be used for the inversion of inputs. Note that there is a 3-input NAND gate shared by both F1...
  9. M

    Acquiring Data from a Digital Thermometer

    Let me preface this by saying that I know very little of circuitry, signals, etc. I have also Googled/searched the forum for help using keywords that are related to this project but also vague enough that I could not find any useful results. I have a friend interested in how the temperature...
  10. P

    What chemical solution to use for cleaning digital camera sensors?

    Since it is impossible to get certain cleaning solutions (in Canada, at least) like "Eclipse" (methanol) and pure isopropyl alcohol (from drug stores) is adulterated with some kind of greasy oils that leave smear marks behind, I would appreciate some help as to what chemical solutions might be...
  11. E

    Using a US manufactured digital phase conveter in the UK

    My home workshop has three woodworking machines, all fitted with dual voltage 3 Phase motors, currently configured for 415V 50Hz. My workshop power supply is 230V single phase 50A. I have been using a static converter to provide the three phase but I would now like to upgrade to a digital phase...
  12. P

    Digital Technology - CDs and Storage Space

    Hi, My teacher gave me the following information and asked me to prove that 1 minute of music requires 10 MB of storage space in a CD. Sampling Rate: 44.1 kHz Bit Depth: 16 bits No. Channels: 2 I am a bit confused. If the bit depth is 16, that means I have 4 bits. But I only get the...
  13. C

    How Do You Determine if a System is Causal and Distinguish Between FIR and IIR?

    I have a couple of questions about the theory about how to tell whether a system is casual and FIR or IIR. First point is about a casual system. Is it true that all FIR systems are casual? How can you tell if an IIR system is casual? I am I correct in thinking that a FIR system only has a...
  14. R

    Programs EE Majors: Should I take Electric Circuits or Digital Logic?

    I'll be taking a heavy workload of classes next semester. This will be the first time I'll be taking all technical classes. To ease my transition, should I take electric circuits or digital logic? What is the general consensus in terms of which one of these classes is more difficult?
  15. sophiecentaur

    Is There a Move Towards Pseudo Random Scanning for Digital TV Displays?

    Since the transition from CRT to digital displays, has there been any move to modify the displays to pseudo random scan for TV pictures, as opposed to raster scan? I have tried Google but the only references I can find refer to vector graphics, which is not what I wanted. There must be someone...
  16. M

    Digital modelling of Inverted Pendulum on a cart

    I am pursuing bachelor in engineering.i have a case study involving the stabilization of an inverted pendulum about it's unstable equilibrium point. My problem is that I have to digitalize my system before i can implement it. Can anyone tell me how to digitalize the system.
  17. B

    CLD Digital Clock Homework: 555 Timer & BCD Decoder

    Homework Statement I want to make a digital clock on hardware using 555 timer and BCD decoder to 7 segment display. Can anyone help me about the circuit ? Homework Equations The Attempt at a Solution I am using the concept to increment the input of BCD decoder with the help of...
  18. DaveC426913

    Adobe Digital Editions: Is Anyone Using It?

    Does anyone use this? I don't understand it. I've got this software app so that I can put ePub books on my Sony eReader, but the app doesn't browse any library. Do I go to Chapters and download A.D.E.s there? What's crazy is that I've done it once - I successfully put a book on my reader -...
  19. Newtons Apple

    Digital Signals on Analog lines?

    Hello everyone I have a question that I've been pondering.. And it probably has a simple answer. I'm studying physics of Telecommunications at college, and we were talking about how you can't send digital square pulses over phone lines. This would require an unlimited need for bandwidth, and...
  20. R

    Is a transistor sensing circuit output analogue or digital?

    Is the output from a transistor sensor circuit analogue or digital? I know that you sometimes need a pull up or down resistor due to a very small current flowing through the transistor even when it should be off. However, in the circuit shown below for example, is the output signal analogue or...
  21. Femme_physics

    How to Handle an Exceeding Number of Digital Output Bits in a System?

    http://img220.imageshack.us/img220/6523/adcon.jpg All is detailed in this image. Is something invalid here?
  22. Femme_physics

    Truth Tables: 0 or 1 - Did I get it Right?

    I want to see if I got it right. In truth tables we only have '0' or '1'...each representing a different voltage, I presume. So far correct? Now, a machine only understands "electrical pulse" or "no electrical pulse"... So, the higher voltage is "electrical pulse"...that would be...
  23. B

    Question about coaxial digital to analog converters

    Is there a coaxial digital to analog converter that only decodes the digital signal into multiple signals for the channels and then converts the digital signals into analog signals but does not serve as a digital tuner? Because most coaxial digital to analog converters do not decode the...
  24. amylase

    How does Nyquist's theory apply to digital recording of opera music?

    Pretty sure I have some misconceptions, please correct me thanks. SHORT VERSION According to Nyquist's theory, if I want to digitally record a live opera and be able to reconstruct back to exactly the original sound quality, I have to sample at at least twice the frequency of the original...
  25. A

    Good notes on wire models in digital circuits

    Hello everyone. I'm trying to do a homework in digital integrated electronics class and feel like I can finish it only if I had a good set of notes. I have problems like comparing the input capacitance of a Mosfet to a wire of certain length, getting RC time loss in a wire, power...
  26. B

    Digital video image stacking

    Hi folks, its been a while since I've visited. I had an idea a few years ago I never pursued and I thought I'd run it past this group simply because not only is it beyond my education to develop but its combining both optical physics and some techniques used in cosmology. OK so here goes I...
  27. K

    Waveform conversion of Analogue to Digital

    I have an assessment at the moment and one of the questions is about the conversion of an Analogue wave to Digital one. I know how it is graphed and the basic concepts but I have no idea how to express it being forced into a grid. I was wondering if anyone knew any websites or books which has...
  28. N

    Prerequisites for Digital Electronics

    Hey guys, I have designed and built digital circuits with relatively low knowledge on circuit analysis (resistor nets, Wheatstone bridges, etc.) or analog electronics. I do know how to utilize Kirchhoff's circuit laws and Ohm's law. Is it necessary to understand analog systems and circuit...
  29. D

    Digital Scratch Pad for Math/Physics Students

    I use a LOT of paper to do scratch work for school (math/physics especially). Instead of using so much paper, is there a digital version of paper where I can maybe use a stylus-type utencil as a digital writing tool for the "digital paper" and erase easily/prevent accidental erasures, maybe some...
  30. L

    Digital circuits 2-input multiplexer implemented into an and gate

    How do you implement different gates by using a two-input multiplexer? What are the inputs supposed to be? How do you implement an AND gate, for example? An OR?
  31. P

    Shorting of digital high and ground

    Hi, I generally work on embedded boards so i always had this doubt generally in any embedded board with micro controller the pins on the micro controller are located very very close, so if i am trying to see the voltage or some waveform on any of the pins using oscilloscope or multimeter and...
  32. H

    DSP - IIR filter, anlog to digital

    hi, I'm studying for a test, and found this question in one of the previous exams but there is no solution and I was not able to solve it myself. It would be very helpful if anybody could help =] Homework Statement h(t) is an analog IIR filter, with the poles λ_1 = -1, λ_2 = -1+i, λ_3 =...
  33. O

    Which is best way to go among digital, analog, microwave/RF or DSP

    Hi all, I have been thinking about doing Master's degree in Electrical Engineering but I'm really not sure which way to go. In fact I'm more into digital and DSP but I though it would be great idea to hear from experts in the field regarding the future job market and salaries especially in...
  34. B

    Analog vs. Digital Circuits: Which is Right for Me?

    I need to decide whether to take analog circuits of digital circuits. I can always take the other one later. But for now, it's a tough call. I am very into computing and its applications, and I love logic; it seems like digital is the way to go for that stuff. However, I am also very...
  35. D

    How does a digital multiplexer work in communication systems?

    Hi, I have a question regarding digital multiplexers. In communication systems, when we use mux, we can combine a lot of low bandwidth channels and transmit as a high bandwidth channel and then use a demux at the receiving end to split it back to the low bandwidth channels. I saw the...
  36. B

    ADC with successive approximation VS Digital ramp ADC

    I've asked this question before. But still I got some unanswered ones. I am really tired, but I cannot sleep if I got something laying there, tingling me. http://pokit.org/get/cfb750b79f49cfc12dc51a74a37f576e.jpg This is digital ramp. In attachments I added a full circuit, from...
  37. F

    Digital audio from a sound card

    I would like to do some audio programming for a school project, but I'm not sure how a computer processes audio and reconstructs it in a sound card. I've had a signal processing course that covered standard DSP topics but I'm not sure when or how they are applied to acquire, store, and...
  38. B

    ADC question(track and digital ramp)

    http://www.allaboutcircuits.com/vol_4/chpt_13/5.html This counter thing. Can somebody explain to me what does it mean to count up? How does a device count "up" :D I know what a clock does, it sends periodic pulses. I believe the idea is, based on much impulses were counted, that...
  39. S

    Troubleshooting Digital Voltmeters

    Hello, everyone. I am trying to add a digital voltmeter to a control box that I built. I cannot get it to respond to the inputs. It reads zero volts at all times. I have the supply regulated and isolated, so that is not the issue. I am reading the proper voltage from the test points I had...
  40. fluidistic

    Tips to buy a new digital camera?

    I've a digital camera since 2005 and it started going bad maybe 1 or 2 years ago. Basically most of the time when I want to take a photo it turns automatically in filming mod. I have to wait/shake the camera in order for it to turn back to photo mod and that's pretty annoying; even more...
  41. E

    Best book for introduction to Digital Design?

    Any recommendations?
  42. T

    Digital Logics Synchronous Counter with Asynchronous Reset

    Homework Statement Design a sequential circuit, a modulo 9 counter that uses T-architecture. The counter content should be diplayed on a seven segment display and by a set of LEDs. Basically, I have to make a synchronous counter and a asynchronous reset using T FF's. We only have JK FF's...
  43. Pengwuino

    Digital Camera control software?

    So I'm taking a bunch of pics at regular intervals to show my class how this borax/glue slime slowly collapse and spread. This happens over the course of a few minutes and it gave me an idea. Is there any software out there that you could hook up your digital camera to and have the software take...
  44. F

    Is the brain analog, digital, both or

    is it way to simplistic to think of it in this context?
  45. K

    Digital logic equation problem

    Hi, I'm new to this forum. My problem led me here. Homework Statement I need to solve this, using simplifying rules. ∫ = Ʃ(0,5,6,7,13) But I always get one extra area when checking with Karnaugh map, which isn't necessary. Homework Equations ∫() = a' b' c' d' + a' b c' d +...
  46. H

    How Can Nonlinear Systems be Modeled without Aliasing Artifacts?

    So I've been having a bit of fun with FFT's of some nonlinear functions applied to sine waves and I noticed 'reflection' of the harmonics due to generation of frequencies beyond the Nyquist frequency. This comes as no surprise, but it left me wondering how one might model nonlinear systems...
  47. M

    Digital Logic; 4 inputs if and only if

    Homework Statement Using a truth table and a karnaugh map, build a minimized circuit (using only AND and OR gates) to have an output if and only if any two inputs A,B,C,D are true (let true = 1, false = 0). Homework Equations karnaugh maps. The Attempt at a Solution My only...
  48. P

    Can Digital Modeling Amplifiers Fully Replicate Classic Analog Gear?

    Musical-recording age Since the dawn of the musical-recording age, the preferred method of recording guitars has been to set up microphones in front of amplifiers and capture the sounds produced. This carried the limitations of eliminating the electromagnetic signal bleed from the amplifier...
  49. A

    Synchronous counter digital clock

    Hi, I am trying to make a digital clock using a synchronous counter. Can anyone please provide me with a proper circuit ? I am having some problems when designing it myself. Thanks.
  50. M

    Pc based digital clock via parallel port using assembly language in tasm

    hi, i have this project and we already have a code and the circuit but it is not working.. it's supposed to display the hours and minutes the problems are: 1. the hour display is not displaying anything 2. the minute displays but it is advanced by one minute so here's the code: TITLE CLOCK.ASM...
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