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. L

    Can my digital camera function at -20 degrees Celcius?

    After 5 loyal years, my Canon Digital IXUS 400 has given in... i can take pictures, but there are red stripes all over them. Maybe it is something fixable, but I've been meaning to replace the thing anyway. So, i put it in a plastic sealed bag in the freezer, which the thermometer indicates...
  2. T

    Digital Audio Player Circuit Question

    Hi, First time poster here. I am just wandering if anyone could get me started on this question. I have attached it. I been doing some studying on my own, but I may not be able to cover all the material needed to finish. I know the digital to analog converter can be collapsed to a single...
  3. L

    Set-up time in digital circuits

    Why should the input in any logic be present before the clock? Is the setup time related to clock rise time?
  4. C

    Need help Digital signals. Energy and power

    Need help! Digital signals. Energy and power Homework Statement ∞ ∑ (3)^2n n=0 FInd the energy of the signal Find the power of the signal The Attempt at a Solution Energy: (3)2n = 32+34+36+...=9+81+...= ∞ N Power: lim (1/(2N+1)) * ∑...
  5. C

    Very challenging Digital signal processing.

    Homework Statement Signal x(n)= (1/sqrt(n)) * u(n) 1.Find the energy of the signal. 2.Is the energy finite or infinite? Homework Equations sum|x(n)|^2 = energy The Attempt at a Solution
  6. A

    Convert Digital Output from DAQ to Analog output?

    We are using a DAQ (data acquisition) board for our project, that has only 2 analog outputs, but we need 4. It also has some digital outputs... Is there a way to convert the digital outputs into analog, and if so, what is it? Thanks
  7. M

    Exploring Verilog & Digital System Design for Career Opportunities

    Hi People! I have a few questions about verilog and other HDL's which I would like to ask. >Where in the Industry are Harware descriptive Languages being used ? >What kind of tasks are being completed using verilog? >What kind of jobs do engineers specializing in Verilog and Digital...
  8. DaveC426913

    Spore: downloading digital ver.

    I just bought Spore, only to find out that it's on DVD and I only have a CD-RW. I'm sure it's possible to download it using the Serial # from the disc, but I can't find where on their site, I've looked all over. Tried asking on the forum but the forum won't let me post (yet). Anyone play?
  9. O

    Mandatory digital television - why

    For years i wondered why would the US Government mandate an end to broadcast TV. And then i came across this thread and was amazed that what i read was even possible. Since I really didn't really grasp what i was reading. So i decided to post it here with the link. Hoping that some of you can...
  10. N

    Convert AB6.4F Hex to Binary, Octal, Decimal

    Homework Statement convert the hexadecimal number of AB6.4F to bas of 16 to its binary,octal,and decimal equivalent numbers.. Homework Equations The Attempt at a Solution i don't know what to refer,as what i know was 6.4 is an even number which could link up binary,octal but i...
  11. L

    Triacs Waveform Damage Digital Equipment?

    Hello PF. I'm building a circuit that uses triacs to switch power on and off for a series of devices. However my teacher warned me that Triacs basically skip the zero part of the waveform, and that can affect digital devices, such as my computer. I'm looking for a more in-depth explaniation...
  12. B

    Question regarding digital communications and bit error probability.

    Homework Statement I am having trouble understanding the bit error probability equation. I need to determine the bit error probability for a coursework. I am given a noise sample and asked to determine the SNR and bit error probability for a signal voltage of 0.5 V. The noise is given as an...
  13. T

    Solve Digital Logic Homework: Simplify w/ K-map, Sum of Prods & NAND Gates

    Homework Statement Using k-map simplify the boolean function: f(w, x, y, z) = \prod(1, 3, 4, 5, 7, 11, 12, 13, 15) into sum of products form product of sums form implement using nand gates Homework Equations The Attempt at a Solution I have the k-map, I understand that...
  14. T

    Western Digital 320gb hard drive bios flash

    I have an external Western Digital 320gb hard drive that has never given me problems. However the only thing i can think of that has caused sudden problems for this external SATA drive is the bios flash that i recently updated. The drive is recognized in mycomputer, however it doesn't say how...
  15. F

    Designing a Digital Timer to Automate Geyser Control

    I want to build a digital timer that will switch my geyser on and off at a preset time in order to save power. I don’t know much about PICs so I would rather try using only logic ICs. It has to have at least 3 preset ‘on-times’ and 3 ‘off-times’. Can anyone help me to get started?
  16. L

    Finding an Affordable Digital Pen for Writing on Tablets/Surfaces

    Hey guys, I was wondering if you guys could provide me with a name of a decent, but not too pricey, digital pen. I am not sure if this is the exact name I am loking for, so what I want is a pen that I can write on a given tablet/surface with and for it to show up on my PC. For example, I could...
  17. R

    Digital Logic Fundamentals help

    I have recently started my second year at Uni and one of the areas I am studying is Digital Logic Fundamentals. However due to a mixup with my timetable I missed the first few weeks of the course. I am trying to catch up but have become stuck on part of the course that wasn't explained well in...
  18. O

    Internal resistance of a digital multimeter

    Homework Statement Provided that the input resistance of the DMM is much larger than the resistance values in the circuit to which it is connected, the DMM will not draw a significant current. Estimate the input resistance of the DMM by connecting the 10 M resistor supplied in series with...
  19. G

    Analog to Digital Converter (Estimation of Input Voltage)

    Homework Statement A 0-10 V, 10-bit A/D converter displays an output in straight binary code of 1010110111. Estimate the input voltage to within 1 LSB (Least Significant Bit). Homework Equations Resolution = Efsr/2^M. (where M= 10 in this case) Eout = X/2^M (where Eout is the...
  20. V

    What is Clock Pulse in Digital Circuits?

    wat is meant by the clock pulse given to the flip flops in digital circuits. Is it just a supply that is given to the ic as long as it is held in on position. How do some chips operate when the clock goes from high to low and not when pulses go from low to high?.
  21. D

    Three Digital Clocks at Different Speeds

    Homework Statement Three digital clocks A, B, and C run at different rates and do not have simultaneous readings of zero. Figure 1-6 shows simultaneous readings on pairs of the clocks for four occasions: ___________312_________________512__ Clock A ___25______125_______200_______290__...
  22. E

    Engineering Understanding Digital Circuit Diagrams: Question About Resistor Configuration

    Hello, I have the following situation. Its probably all very simple, but I want to be sure I understand this correctly. http://i67.photobucket.com/albums/h304/john_ukranian/circuit2.jpg First of all you must know a little about my background. I know what electricity is, how it works, how...
  23. Cyrus

    Find the Best Digital Camera Under $200.00

    I need to get a new digital camera that's under $200.00 and has good quality pictures and video. What do I look for in a good camera? I know its not the MegaPix because the camera I have now is 5.0MP but sucks. So, its got to do with the quality of the lense. Any ideas? Thanks!
  24. L

    Has anyone here heard of a digital potentiometer for household current?

    Has anyone here ever heard of a digital potentiometer that is built for household current? I'm talking about US power supply (110v 60Hz AC). I've been looking for one to buy. I tried searching online to look for prices, only to find that they don't seem to exist. Any links to an online...
  25. V

    Digital logic circuits material

    could anybody suggest me a good learning material for 'digital logic circuits'
  26. D

    Digital signature with information theoretical security

    Is there such a classical scheme? I only know of those which offer security from computationally bounded attacks.
  27. C

    Everything can be broken down to a digital signal.

    If we take a segment of length, we can divide it in half. We can take one of the remaining halves, and we can divide it in half again. We naturally assume that this can go on forever. We assume that no matter how small a length we end up dealing with, we can always - at least conceptually -...
  28. S

    Digital Signatures: How Files are Authenticated

    Digital Signatures ?? What exactly happens to a file when a digital signature is executed? I am interested in how this is authenticated for both text and image files.
  29. T

    General-purpose digital multimeter?

    Help me out, fellow EE's. Anyone know of a decent, general-purpose digital multimeter? I'm asking your opinion, because I'm sure a lot of you have your personal favorite. Thanks!
  30. C

    Digital Volt Meter: Setting Reference Voltage & Input Voltage

    This circuit was used to make a digital volt meter. What I'm confused about is the exact use of the potentiometer on the RHS of the diagram. I know is was used to set the "reference voltage" to 4V and all all output voltages from the meter would be from 0-3.999 volts when displayed. The...
  31. D

    Can anyone improve the Gottesman and Chuang quantum digital signature scheme?

    I have to come up with a new quantum digital signature scheme. I've read the one by Gottesman and Chuang (http://arxiv.org/abs/quant-ph/0105032v2), but I can't think of a way to improve it. Does anyone have any pointers?
  32. L

    Data from a digital polarimeter?

    Not sure if this is where this really belongs, as it's a question about equipment rather than actual chemistry, but, it's equipment that's usually used by chemists, so I figured I'd have the best chance of something being familiar with it here. It's a simple question really; what does the...
  33. B

    Don't know enough about digital signal processors

    So I'm a physics major who is doing a summer research internship that is mostly electrical engineering. My research adviser is also a physicist and doesn't really know much about this either. But essentially what we need is take an analog signal and digitize it (to about 100 MHz), and use a...
  34. S

    Digital Billboard: Cost & Power Usage in Ghana

    I am in ghanawats u would want to know how much it would cost to purchase a digital billboard about 3 x 5 meters and how much power it would consume thanks
  35. I

    Can Digital Encoder Make a Difference in Transmitting Low Frequency Signals?

    is there electronic transceiver chips that can transmit very low frequencies (1Hz-90KHz) for digital signals of low power, and small antenna chips for that frequency. from what I was reseaching I could find anything under a couple of MHz. But does using a digital encoder make a difference.
  36. T

    Circuit designs with crystals and layout of digital clock lines

    I have two different types of questions regarding crystals and clocks. I can't remember if I've asked these question before. I'd appreciate any input on this topic. Crystal external circuitry: Almost any IC with an external crystal has two pins to connect to it. Now my question is how...
  37. K

    Speed of signals in digital phone line?

    [SOLVED] Speed of signals in digital phone line? I know that the rate of information transfer in a phone line is 64 kbit/s. I originally thought that this rate of info transfer was the same as the speed of transmission but I now know that this is not true: the speed = distance / time for signal...
  38. J

    Voltage based Digital to Analogue convertor

    can someone answer this question: What is the disadvantage of a voltage based Digital to Analogue convertor ? thanks in advance
  39. U

    Buying Digital Voice Recorder for Lectures

    I'm definately thinking about buying a digital voice recorder to tape my lectures. I wanted some that could hook up to a laptop and that I could listen to with headphones. Is this possible. I've never done this so I don't know where to look. Does anyone have a brand or model of preference?
  40. R

    Digital Phase Control using IGBTs

    My goal is to implement digitally-controlled reverse-phase-control (dimming) of 120V/60Hz AC power, using IGBTs as the switching device and a micro-controller to control them. The reason I am using IGBTs instead of TRIACs is because TRIACs cannot realize reverse-phase-control. IGBTs can, and can...
  41. P

    Probability density function of digital filter

    given that x has an exponential density function ie p(x) = exp (-x) and x(n) & x(m) are statistically independent. Now y(n) = x(n-1)+x(n) what is the pdf (probability density function) of y(n)
  42. E

    Exploring Digital Signals over FM for FSK

    Hi, I'm thinking about transmitting digital signals with FM. The effect I'm trying to achieve is FSK. Can I just feed the digital signal to the input of the FM transmitter? With FSK the carrier is frequency modulated with 2 frequencies, but since the digital signal has infinite bandwidth...
  43. L

    Troubleshooting Digital Electronics: Why Don't My ICs Work?

    I'm not really new to Digital Electronics, but this is confusing the crap out of me. My school's started a DE class and at the moment we're getting all our equipment worked out and stuff, but for some reason NONE of our IC's work. We're using a 9-volt batter with a 7805 regulator for 5 volts...
  44. Saladsamurai

    Any advice on buying a new digital Camera?

    Hey yall. I live in north of Boston and I am headinf down to West Palm Beach Florida for a long overdue vacation with my girlfriend. I have a kodak easy share that is a little clunky since is a few years old. It is a 5 MP and it takes decent shots. I am looking for something slimmer that...
  45. M

    Digital Voltmeter Help - Solve ATX PSU Issue

    Hello all, I made a custom power supply using a standard ATX computer PSU. I took the -12V and +12V leads to get 24V then put a LM338 on the positive side for a 1.25V to 22V adjustable ouput. Works great. I wanted to put a digital voltmeter on the adjustable output so I would know what...
  46. T

    A question in solving basic oprations in digital logic

    1. 11010101 / 11011 2. code each one of the deximal numbers by weight ( 6, 4, 2, -3 ) i don't know what the meen but some how i am sopposed to code using them 3. code the number 729 in excess3 code the number 729 in BCD code the number 729 in 2421 code i lack the theoretical knowledge to...
  47. P

    Digital and quantized signal, are one same thing?

    digital and quantized signal, are one same thing?
  48. U

    Electromagnetics or Digital Signal Processing

    I have three courses that I can choose from: Electromagnetics or Digital Signal Processing II or Semiconductor Physics and Theory for my spring? Which do you suggest?
  49. D

    Digital read out of air pressure over time

    I am trying to get some information to see if there exists a sub-system which can monitor air pressure (~200 psi) over a certain amount of time (less than 5 min.) and can output the readings so the information can be input real time or saved to a file which can later be input to Excel...
  50. G

    Analogue and digital question (really )

    [SOLVED] analogue and digital question (really urgent!) Homework Statement Hi all; I've got a question: Two mobile phone signals were sent a bit at a time along the same wire but the bits didn't get separated. They produced the text message below. What message was being carried by each...
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