Digital Definition and 492 Threads

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

    Probing high speed digital circuits

    I have a 100MHz bus going from CPU to Memory. The routing length is about 2inches. So there is no termination. When I hook up the bus to a Logic analyzer, how do I know the Logic analyzer probes are not causing any reflection and messing up the bus signals. The length of the probe is about...
  2. L

    Digital circuit with D-flops and need to deal with asynchronous signal

    Suppose you design the digital circuit with D-flops and need to deal with asynchronous signals. Typical logic is receiving the async signal with a D flop followed by another D flop to deal with metastability. But how does double flopping benefit against the metastability ? The first flop gets...
  3. M

    PAM schematic or wiring diagram for Digital Communications

    Hi. Who among you know a site where I can find a wiring diagram or schematic diagram of PAM (Pulse Amplitude Modulation)? I badly needed a diagram of it for my prototype in Digital Communications. I've been searching for it in Google but it only gave me different diagrams and I can't tell...
  4. P

    High frequency from AC tig welder affects digital ammeter?

    I need a solution to the question, Which clamp-around-the-cable ammeter (digital or analog) can be trusted in measurement of current draw by a high-frequency AC tig welder? High-frequency AC is a requirement of welding aluminum, and an electrician measured 150+ amps at full power welding...
  5. M

    Is the Olympus Stylus Tough 8010 a good digital camera option?

    Hi, I'm after a digital camera. Doesn't have to be too special beyond a) a high resolution (12MP minimum) and b) reliable and likely to last a while. I'm looking into this - Olympus Stylus Tough 8010 14 Megapixel Digital Camera - Silver 5X Optical Zoom - 2.7 LCD Touch Display - Waterproof -...
  6. K

    Zero State Step Response vs. Step Response in LTI Systems?

    what is the difference between zero state step response and step response in an linear time invarient system?
  7. M

    How to increase the current source/sink capacity of a digital PWM signal

    I would like to increase the maximum current that a PWM signal from a microcontroller can source/sink from +-25mA to +-500mA. The output should have the same peak-to-peak voltage (0 to 3.3V) and should not be inverted (i.e. follows the input). The PWM frequency is ~30kHz. I have looked...
  8. M

    What is a digital twin spark ignition system?

    what exactly is this digital twin spark ignition system?
  9. J

    Difference between electronic and digital

    I have seen most people say electronic dictionary, diary etc. I often confuses the terms. Since long time I have referred to my handheld Franklin dictionary as digital dictionary. Am I wrong?
  10. H

    Sensitive quick digital thermometer

    Hi, I am wondering if anyone can advice on which kind of digital thermometer would be most suitable for the following conditions: 1. It should quickly be able to detect a sudden increase in temperature. The actual temperature is not important, only the detection of a sudden change in...
  11. T

    M-Theory: is a String A digital Data Register ?

    Dear Friends: I am a PhD. in Chemistry, born and studied in Germany, whereas I am working in Brazil in industry. My High Mathematics knowledge might be inferior to most of you. Therefore I beg your pardon, if I explain my ideas somehow naively. The question is, if STRINGS may vibrate at...
  12. E

    Relationships between bandwidth, Fourier trans & digital modulations

    HiHo! W. Stallings's "Wireless Communications & Networks, 2nd edition" explains the relationships between bandwidth and Fourier transformation by depicting a square wave. The square wave is approximated with a Fourier series having several sine terms. The bandwidth is then defined by the...
  13. L

    Why analog communication over the copper rather than digital ?

    Hi, I wonder if someone could shed light on my question. It's kind of related to Fourier Transform and attenuations on signals. As everyone knows, in the early days, the communication on the local loop was on dial up which was basically analog communication.The digital data in computer...
  14. Vectronix

    How Do Digital Multimeters Measure Voltage, Current, and Resistance?

    How exactly do digital multimeters measure things like potential difference, electric current, and electrical resistance?
  15. A

    Inverted Pendulum Digital Controller Design *WILLING TO PAY FOR YOUR TIME*

    Hello I have attached the sheet that describes the problem. This is supposed to be simulated in MATLAB first with no disturbance and then with disturbance. My problem is that I am not sure how to program a lot of this stuff in MATLAB so that is one thing i need help with and then just putting...
  16. B

    Combining Digital and Bipolar Tech for VLSI Layout Project

    Hi, Please can anyone give me some ideas of a "relatively" easy circuits involving digital and bipolar technology (meaning both technologies combined) to make a vlsi layout? It is for a project and I really did not find something interesting. Thank you
  17. J

    Calibration Uncertainty for average results when digital meter used for readings

    Hello, I am trying to work out the total uncertainty for a measurement, so am using the square root of the reading uncertainty squared + calibration uncertainty squared + random uncertainty squared equation. I have found in a textbook of mine that the calibration uncertainty for a digital...
  18. T

    Output specific frequencies with digital electronics

    I'm trying to figure out how to build a breadboard instrument using either push buttons or logic switches as they keys that will play each note. The issue that i am having is that I don't think finding all of the perfect resistor and capacitor combinations for each note is a good idea. So, i...
  19. Greg Bernhardt

    Digital Economy Bill in UK a Menace to Privacy?

    The UK parliament*recently passed a piece of legislation called the*Digital Economy Bill (now known as the Digital Economy Act, or DEA). *The DEA is a collection of measures designed to target copyright and other IP violations on the Internet and in other forms of electronic communication...
  20. S

    Design digital logic clocks with given frequencies

    Homework Statement Assume you have a symmetrical clock at 100MHz. Design a logic circuit with four outputs of clocks at 100MHz, 50MHz, 25MHz, and 12.5MHz. The logic circuit should have 2 inputs to select output clock rate. Homework Equations N/A The Attempt at a Solution For...
  21. M

    Digital Signal Processing - signals, reconstruction, filters

    Homework Statement No problem statement - just the following questions. Homework Equations 1.Display on a CRT is most similar to what reconstruction filter? 2.How many samples are required to represent a given signal without loss of information? 3.What signals can be reconstructed...
  22. N

    Engineering How Essential Are Truth Tables in VHDL Digital Circuit Design?

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  23. K

    Digital Voltmeters: How do They Work?

    How do digital volt meters work? If I connect a Digital voltmeter to a battery, how does it measure the voltage. And I'm assuming it measures terminal voltage, not emf? This question's probably simple but it's been bugging me for awhile. All I can think of is that the DVM produces (or...
  24. M

    Transmit Digital Signal using Analog Modulation?

    Hello, I know that you send digital signals using ASK, FSK, PSK modulation. I was wondering though if it was possible to send that same digital signal using FM or AM modulation? If not, I was wondering if anybody knew of any popular ASK or FSK modulation IC's? Thanks!
  25. V

    RCHow can a digital circuit perform sine wave integration using TTL chips?

    I need to design a digital circuit using TTL chips (adders, registers, etc.) to perform integration on binary values. The binary values are converted from analog signals such as a sine wave, constant, square pulse, and saw tooth. I can achieve the process for constants and positive signals...
  26. E

    Accurate, Affordable Digital Thermometer?

    I'm looking for an accurate and reasonably priced digital thermometer. Our lab has lots of cheap models that provide precision of 0.1 C but are only accurate to +/- 1 C. I can lump them together in a room and get a range of about 3 C. Some sellers don't even provide the accuracy information on...
  27. Ivan Seeking

    Digital Nation: Life on the Virtual Frontier

    I am watching this now and it looks pretty interesting. One thing that caught my attention was a segment about a Japanese school that teaches internet etiquette to young children. http://www.pbs.org/wgbh/pages/frontline/digitalnation/etc/synopsis.html Watch online...
  28. C

    CMos digital integrated circuits by Kang-Leblebici

    Im using CMos digital integrated circuits by Kang-Leblebici. On p85-86 a description of how a MOS layer works is given which I can't fully understand. First, the MOS layer is likened to a capacitor. Then they discuss how the work functions and fermi levels of the metal, oxide layer and the...
  29. Y

    Digital Remote Control: Can I Replace the Antenna?

    Hey guys, I understand remote control cars and such use their little antennas and shoot radio waves to the car and control it... My question is can I make some kind of device such that I can remove the antenna on the car and instead hook up to the reciever a digital input processor which will...
  30. V

    Digital Capacitance meter using microcontrollers

    Hey friends, I am trying to make a digital capacitance meter by using a HSC08 microcontroller chip (MC9S08QG8). Unfortunately this is one of those courses where one doesn't know anything because of lack of pre-requisites. Anyhow (enough complaining) what I have been trying to do is the...
  31. J

    Digital filter design with matlab

    I'm to design a 2nd order, N=2, butterworth HPF starting from the normalized transfer function for a LPF: HN(s)=1/(s^2+1.414*s+1) Given: T=0.004 Ωc=0.8 pi wc=192 pi To find the transfer function of the HPF, substitute s for wc/s: H(s)=HN(wc/s)=s^2/(s^2+853*s+363833) Here's my...
  32. K

    How to Cascade Two Sets of 4-bit JK Flip-Flop Counters?

    hi there... I wanted to ask about a way to cascade or let's say connect two sets of 4-bit flipflop JK counters together.. I want to create a circuit that is an up-down counter from 0 to 99..but as it is known, its difficult to use 8 inputs ofcourse.. so the best way is to have two sets of 4 jk...
  33. Pythagorean

    News The Possibility of Large-Scale War in the Digital Age

    How probable is a large-scale war in the next 20 years? Are there any significant growing tensions between powerful countries? Would a violent war be constructive to anyone? I remember this quote: "I know not with what weapons World War III will be fought, but World War IV will be fought...
  34. 6

    Digital Electronics: State machine

    Homework Statement (a) How many states does this system have? (b) How many rows will there be in a state transition table? (c) Provide the state transition table. (d) Draw a state diagram of the system. (e) Describe what the circuit does in words. Homework Equations The Attempt at a...
  35. K

    Help making a digital delay circuit

    right... i need to make a programmable digital delay circuit that can delay a pulse by a few nanoseconds. sorry if any of the following info is vague, I am only an apprentice and i have taken this on as a college project, but the poduct will be used at work in a calibration lab, but i am not too...
  36. D

    Help with digital signals (discrete fourier transform)

    I've been working on this problem for around three hours, and I'm getting nowhere... I think it may be that I don't have even the most basic grasp of the material to even get a decent start on the problem, but hopefully someone here will be able to help me... Homework Statement Calculate...
  37. G

    Digital Waveform Graph, Circuit Resistance, and Solenoids

    Hi everyone, On this page, only questions 4 and 5 I need help for. For question 4, I really have no idea, and there's no real "working" that I can show to really say that I've given it a crack. For question 5 on that page, I thought along these lines: In series circuits, voltage...
  38. S

    How Do You Simplify an ADC Circuit Using Kirchhoff's Laws?

    Hello, I do not know if it's really upper physics but I have some exercices to do and I find them a bit difficult for a beginning. This is a circuit: http://up.sur-la-toile.com/iu7M I'm asked to simplify it like shown on the drawing so that afterwards I get this circuit...
  39. U

    Engineering Why Does My Verilog Code Not Simulate m2 and m13 as Expected?

    Homework Statement given the midterm function: f= m1 + m2 + m3 + m6 + m7 + m10 + m13 -supposed to simplify this function Homework Equations N/a The Attempt at a Solution i got the following functions using Karnaugh mapping: f = \overline{x_{1}} \cdot \overline{x_{2}} + \overline{x_{1}}...
  40. O

    How Do You Convert Analog Signals to Digital Using 4-bit Encoding?

    An analog voice signal that vary over the range 0-50mA is digitised by sampling it at 8 kHz. the first four sample values are 10,21,36 and 16mA. write the corresponding digital signal (a string of 1 and 0 bits) by using a 4 bit representation for each sample
  41. N

    Would a digital multimeter contain an A/D system?

    In the lab for my physics course we're using a Vernier "A/D system" to collect/transmit data from the experiment sensor to the computer for analysis. It's my first time using one, and we weren't told anything about it. In this sense does A/D mean "analog to digital" converter? Would a digital...
  42. A

    What is level triggering in digital ccts

    what is level triggering in digital ccts. I think borth level triggering and edge triggering are same. Because in a pulse streem, edge have a level. please help me.
  43. A

    Build Digital Magnetometer with Gates - Tutorials/Guides

    Hey I am interested in building a device that can give the local magnetic field in 3D. I'd like for the display to be digital not a mechanical gauge. I would not want to use any sensors or microcontrollers for that matter, but make it with gates and everything. If you do know how to make it...
  44. M

    Difference Between Analog and Digital Technology

    A few days ago, I was reading an article on wikipedia about how musical synthesizers work and I read that initially analog technology was used and later digital technology began to be used. What I uderstood from analog technology was that only one part of the sound was altered, which...
  45. B

    Exploring a Career in Digital Signal Processing

    Career in DSP! I am doing b.e electrical and electronics from bits-pilani , india. I have just completed my second year. I had a course on signal and systems(fourier, laplace, sampling etc.) in my fourth semester.It has aroused my interest in dsp field. Can anyone here guide me on how to...
  46. C

    How Does Magnification Correspond to Working Distance in a Digital Microscope?

    I'm hoping this is the best forum for this... I'm considering buying a digital microscope for my lab. Specifically I'm looking at this model: http://www.sunrisedino.com/index.php?main_page=product_info&cPath=9&products_id=126 The reason I'm looking at this is that it's both portable, small...
  47. N

    Is our universe a mix of both continuous and discrete elements?

    Two recent posts/threads asking are spacetime and frequency continuous got me wondering: Do we live in a continuous or a discrete universe? Or a mix of both? Your thoughts appreciated. (Do we have experimental evidence anything is continuous...I can't think of anything..also, is this...
  48. L

    Signal filtering in digital transmission

    Homework Statement Let's suppose a set of numerical values {an} sent with a rectangular function, period T and with amplitude an. The signal can be expressed as follows: x(t)= \sum a_n \Pi_T (t-nT) To optimize detection at reception, the signal x(t) is processed through a filter whose...
  49. B

    How Do You Design a Digital FIR Filter to Remove a 70Hz Disturbance?

    I have a question which is to design a filter of the form: y(n) = a(0)x(n) + a(1)x(n-1) + a(2)x(n-2) to remove a narrowband disturbance with frequency f0 = 70Hz. The sampling frequency, fs is 280Hz. I've made an attempt at answering it, but don't think my result is correct: w0 = (2*pi)*...
  50. N

    Digital Fourier Transform - create frequency axis

    Homework Statement Using Matlab, I need to record vowels (a, e, o, i, etc) of my voice and apply a digital Fourier transform (DFT) to the recorded sound signal. The resulting signal should be a periodic train of 'spikes', with modulated amplitude. The modulation of the amplitude is what forms...
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