Digital Definition and 474 Threads

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...

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...

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?.

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__...

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...

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!

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...

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

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

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 -...

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.

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!

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...

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?

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...

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...

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

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.

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...

[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...

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

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?

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...

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)

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...

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...

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...

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...

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...

digital and quantized signal, are one same thing?

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?

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...

[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...

https://www.dtv2009.gov/AboutProgram.aspx I ordered my $40 discount coupon for a converter box, since I am one of those who make do with rabbit ears.

Homework Statement What physics principles are applied to the design and use of digital cameras? 2. The attempt at a solution • Charging the battery requires electrical and magnet field use from the source it is obtaining the energy from. The battery creates electric potential...

The process known as sampling in reference to music is as follows: A device called a sampler is used to convert an analog signal representing sound waves into digital information. This digital information is called a sample, artists often use samples in their music. however, this not the only...

Can someone define the process of digital sampling for me, perhaps a website with some info on it. I'm writing a term paper and I keep running into sampler adds, but no concrete facts. What is the function of sampler? I'm referring to a device that turns an analog recording into a digital...

I have a digital camera but the software does not support windows vista, i have been to the cameras website but there is not a solution listed, am i sunk or is there a way around it? Thanks.

I don't get why do we use Flip Flops for Finite State Machines? Can anyone explain? -Thankyou

What do they mean by saying that " If the clock frequency is 45MHz and we use 50MHz then the circuit will not work". I am confused :rolleyes: I don't understand the timing analysis in digital logic. Please help me out -Thanks

I'm trying to design a digital circuit which will accept input from a touchscreen. Does anyone know if a touchscreen is manufactured which has input/output cables which are meant to be read by a digital logic circuit? (yes, it'll be a very complicated digital logic circuit). Even if I can...

[SOLVED] digital logic design i want to simplify this function using four-variable map: F(w,x,y,z) = \sum(0,1,2,4,5,7,11,15) , the map contains one "1" at the upper right corner. my question is how can i take this 1 in a group? or what can i do with it?

Greetings all, I thought I'd post my idea and plan for my digital electronics project here to see if I can get any tips or meet people who may have some expertise on this subject... The basic idea is a 'lock' that is opened by the correct series of input notes. Using a PIC, what I'm...

Homework Statement Draw the schematic circuit diagram that implements the following expression using as few basic gates as possible (AND, OR, NOT, XOR, NAND, NOR). The prime denotes the complement: f = w^\prime z^\prime + w^\prime xy + wx^\prime z + wxyz The Attempt at a Solution From the...

Is computer data ( stored or transmitted) immune to the effects of QU ? If not then with a program handling billions of bytes of electronic data is corruption due to QU ever an issue

Homework Statement 1. Derive the truth table for the circuit. 2. Derive the Boolean function directly from the circuit. I can't the function to agree with the truth table. I don't know what I'm doing wrong. I somewhat positive my truth table is right, but I think my function statement is...

Hello All, I'm wondering if there is a very simple (and cheap) method to transmit data from the board with my microcontroller on it to another board? I was looking around ant patallax has a nice transmitter/receiver pair for about $30 that you can buy here...

Hi everyone, software engineer here that needs help with a basic EE project for an automotive application. I have a digital hall sensor that goes high (+2v) once per engine revolution. This high signal is used to time the ignition spark, and its frequency is used to determine the engine RPM...

Determine if the CT systems are 1) casual or uncasual 2) memory or memoryless. [SIZE="1"][SIZE="2"]Definitions: Casual: If for any time t1, the output response y(t1) at time t1 resulting from input x(t) does not depend on the values of the input x(t) for t > t1. Memory: If the output at...

Hello All, I am working on a microcontroller-based control circuit that can generate different frequencies for experiments I am working on, but I also want to add a feature that allows the microcontroller to take voltage measurements from my test setups. The 68HC12 controller board I am using...