Analog Definition and 287 Threads

ANALOG Computing (an acronym for Atari Newsletter And Lots Of Games) was an American computer magazine devoted to Atari 8-bit family of home computers. It was published from 1981 until 1989. In addition to reviews and tutorials, ANALOG printed multiple programs in each issue for users to type in. The magazine had a reputation for listings of machine language games–much smoother than those written in Atari BASIC—and which were uncommon in competing magazines. Such games were accompanied by the assembly language source code. ANALOG also sold commercial games, two books of type-in software, and access to a custom bulletin-board system.
Originally the title as printed on the cover was A.N.A.L.O.G. 400/800 Magazine, but by the eighth issue it changed to A.N.A.L.O.G. Computing. Though the dots remained in the logo, it was simply referred to as ANALOG or ANALOG Computing inside the magazine.
While the program listings were covered under the magazine's copyright protections, users were granted the right to type them into their computer for personal use, so long as they were not sold or copied.

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  1. M

    What is the uncertainty in 5.00mm measured by analog device?

    Homework Statement What is the uncertainty in 5.00mm measured by an analog device? Homework Equations No equations, Uncertainty and error analysis question The Attempt at a Solution I know that the uncertainty is half the smallest division but i can't figure out what is the uncertainty and...
  2. adamaero

    Easy transistor question: NPN--the corresponding change?

    Homework Statement Given: an npn transistor having VBE = 0.76V for a collector current of 10mA at T=350 K (n=1) Find the corresponding collector current for VBE = 0.70V 2. Relevant questions a) Wouldn't that temperature be way to high for the transistor to act normally?? I mean 350K is 170F...
  3. adamaero

    Predicting AC open-loop gain for an internally compensated op-amp

    Homework Statement An internally compensated op amp has a DC open-loop gain of 1,000,000 (V/V) and an ac open-loop gain of 40dB at 10kHz. Provide the expected gain in dB at 1kHz... Homework Equations Please help, I don't know what to use for an exact answer. The Attempt at a Solution Beyond...
  4. 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.
  5. L

    Analog clock algebra word problem

    Homework Statement define the time in an analog clock up to the second. The time needs to be such that the minute hand, is at the exact same position as the hour hand. This position of the hands needs to be between 10th and 11th hour. Homework Equations 3. The Attempt at a Solution [/B] I...
  6. E

    I Is there a boiling analog to sublimation?

    Liquid water sitting can evaporate without a problem, given that the vapor pressure surrounding it is less than the temperature dependent saturated vapor pressure. Similarly, an ice cube can also evaporate without becoming liquid under these same conditions. However, an extreme form of...
  7. SSGD

    Microcontroller Pulse Width Modulation to Analog DC Voltage

    What are some effective ways to convert a Pulse Width Modulation from a Microcontroller to a DC Voltage as a function of Pulse Width? 1. Use a low pass filter to remove the unwanted harmonics and leave only the 0th term of the Fourier Series. What produces a better DC Voltage an Active or a...
  8. S

    Reading an Analog Meter, given ranges

    Homework Statement Let’s say you know that the input signal will be about -0.25 V. What range should you select to give maximum deflection without going off scale? Draw a line, with a straight-edge, on the picture above, showing how the pointer would point. Below is the picture of the analog...
  9. putta

    Single CT (600/5A) to infeed PLC Analog card+Amp analog meter

    Hello, i have Current Transformer 600/5A, it connected with Amps Analog meter (0-600A @class2.5). i want to update without remove connection of old analog meter and update PLC analog input card +signal convertor 0-4mA, my doubt is will take connection for both (measuring device) at same point...
  10. KT KIM

    Derive the Analog of Gauss' law

    I am stuck with this (d) all the other (a),(b),(c) were just like (a) E= −∇φ (b) ∇ · E= −∇2φ (c) ∇ × E I know only very basic about Gauss' law, the problem is not from Electrodynamics course. I don't know what should I do to solve (d)
  11. P

    Analog Signal of Noncontinuous Variables

    In my electrical engineering Textbook, In the beginning of it, when they were introducing analog and digit signals, they said an analog signal was a signal that depends on some sort of changing continuous variable such as time. The later went on to say that Analog signals can be depending on...
  12. Geek007

    Decomposition of apriodic and periodic signals

    Hi there, why the decomposition of periodic Composite signal give discrete frequencies and decomposition of aperiodic signal give continuous(in decimal) frequencies. please kindly do explain the concept behind in as simple words possible. Thanks
  13. AndroidX7

    Exploring An Innovative Analog Clock Design: Can Gravity Affect Time?

    So I have no form of engineering education, but I had a hypothesis on an analog mechanical clock being able to account for the effect of gravity on time with a form of super-sensitive weight and scale system to control speed. Has this been done? Either way, any thoughts on the matter?
  14. M

    Simulating a simple analog computer?

    Hi, anyone into analog computing? I was wondering if there is an example of a simple virtual analog computer somewhere (open source), I can't seem to find one. I'm interested in basic principles of advancing the state of the network, as you must do on a digital computer. I found some complex...
  15. 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...
  16. L

    Analog of Gauss' law in gravity

    Gauss law in case of sphere which has charge ##q## is ##\oint \vec{E}\cdot d\vec{S}=\frac{q}{\epsilon_0}## Is there some anologone for case of sphere with mass ##m## such that ##\oint \vec{G}\cdot d\vec{S}=4\pi \gamma m ## and what is ##\vec{G}## in that case?
  17. P

    How to reduce the current of a signal by an exact amount?

    Hello all, The root problem is that I can't put all my analogue inputs onto one input card (each card has 4 inputs) on the project I'm working on. We have four sensors, they should all output 4-20mA. Two are source type outputs, supply voltage goes in, sensor current comes out, current is...
  18. 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...
  19. LarryS

    Does classical vacuum permittivity have a QM analog?

    According to Maxwell's Equations, the classical vacuum permittivity and permeability have a very important role: They determine the speed of light. But it seems like these two important concepts are not as precisely defined in the quantum world. Are there rigorous analogs of these two...
  20. 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...
  21. GGGboat

    Engineering How to Design a BJT Analog Circuit with Specific Transfer Characteristics?

    Homework Statement hello, i need to design analog circuit that has a transfer curve as seen in the following image using resistors, capacitors,voltage, and BJT (with beta value of 100). the parameters are: A=75 f1= 21Hz f2=21 KHz M1=40 M2=-20 the circuit also need to have input resistance of...
  22. Natanijel

    Solve the Audio Jack Mystery with Nat

    Hello everyone :) I came across a strange situation today when I was listening to my music with my headphones on. When I pressed play to a song, the instrumental intro started off fairly normally (although the audio sounded a little "thinner" than usual, as if compressed), and then, when...
  23. Z

    HR neuron model using analog computer technique

    Hi Everyone, I am simulating(using HSPICE) HR neuron model using analog computer technique but I am not getting the required response. I am using uA741 model of opamp and MLT04 model of multiplier. I have tested these components individually and they are working fine. I doubt there is something...
  24. C

    PIR Motion Sensor with Analog Output

    I'm working on a little arduino-like project that involves a motion detector with customizable sensitivity. The ambition here is that I could get a PIR sensor wired up that would give an analog-esque output depending on how much motion it detects. I know standard PIR sensors have a...
  25. A

    Designing a Gearing System for an Analog Clock: Need Help!

    This task seems to me like it should be rather menial but I can't seem to wrap my head around it. I've already designed a circuit to run an analog clock with components I have already got sitting around my work bench. When it comes to designing the gearing though, I am struggling. My basic...
  26. D

    Using analog computer to solve 2nd-order diff eq

    I'm trying to build a circuit to solve the differential equation x''+2x'+x = f(t), where f(t) is a sine wave with frequency 5Hz and amplitude 0.5V. I am supposed to get a sine/cosine wave (as the diff. eq is just the same as the ove governing spring-mass forced oscillation) as solution, but...
  27. S

    Is a Ph.D necessary for success in the analog IC industry?

    Im trying to pursue a M.S degree on analog IC design and want to know how good is the market for analog IC designers these days in North America and/or Europe. Also, is a M.S enough to do well in this area or should I think about getting a PhD ?
  28. S

    Rf basics, digital vs analog info tx

    Sir, i need some basic information about analog vs digital signal/information transmission. i have few Questions and and idea to discuss weather its feasible or not. [Q1] can digital data requires same bandwidth as analog data contains as if i convert analog information to digital using DAC and...
  29. E

    Signals Description (Digital, Analog, Discrete-time, etc)

    I really hope you guys can help me. On the picture below we have 2 signals. Let's call signal X the one that is drawn with a dotted line. The other one we will call signal Y. Now given the 5 options below, where one and only one can be correct, which one would you choose? A) Signal X is...
  30. A

    Need help classifying this circuit

    Hi everyone, I am trying to understand amplifiers better and had one here that I would like to build and test: http://www.ke3ij.com/amp.htm How would this amplifier be classified as? I was thinking class AB, as it has two common emitter gain stages in the beginning which serve as a pre-amp like...
  31. V

    Understanding Analog Signals & AC

    Also can we have an analog signal in alternating current?
  32. xconwing

    Analog Filter Circuits NCEES Ref Handbook p206 - Understanding R1 & R2 in Fig.2

    NCEES Reference Handbook p.206Hi, My question is: In Fig.2, how can R1 and R2 be parallel? If anything, it should be in series because capacitor in the long run is an open. Thanks ahead.
  33. O

    Is this a typo? Analog to digital sensor

    Homework Statement See picture. The Attempt at a Solution So, based on the two questions I looked at the graph and calculated the corresponding values a) 40 cm b) 200 I checked the solutions which say: a) 40 cm b) 20 cm Is their answer for b) a typo, or am I reading it incorrectly?
  34. O

    Analog to digital temperature sensor

    Homework Statement A temperature sensor has a full scale output of 0 to 5 volts which corresponds to a temperature range of 0 to 100ºC. If the sensor is interfaced to a 12 bit Analog‐to‐Digital Converter (ADC) with a full‐scale output range of 0 to 10.0 volts, what decimal value will the ADC...
  35. A

    Time Dilation: Exploring the Effects of Speed and Gravity on Time

    As far as I'm informed time slows down the lower the gravity and the faster we move. Let's say I go out in space with an analog clock and orbit the Earth. When I come back to Earth after, let's say, a week will my analog clock show different time from the clocks on the planet ?
  36. J

    Isolated Analog Voltage Measurements

    Hello All, I'm working on a design for a board that will allow me to plug in a standard 10x scope probe and then reduce and isolate the signal to go into the input of an ADC in a microcontroller (0-5V range) with a max bandwidth of 100 kHz. I have been shopping around for a while looking at...
  37. J

    Can Analog Memory Exist? A Physics Inquiry

    "Analog" Memory? Is anyone aware of physical or mathematical reasons why "analog" memory is not possible? That is, a system that takes in a continuous waveform, saves it, and then later releases the same continuous waveform without any sort of sampling or interpolation. I certainly can't...
  38. C

    Creating an RF Signal using analog methods

    How is this done. Been reading about sputtering and DC sputtering is extremely simple. However, I'm not very experienced with RF circuitry so understanding exactly how to design that circuit confuses me a bit. Been reading about RF circuits but to generate an RF signal every method I find uses...
  39. N

    Digital to Analog converter concept problem

    Homework Statement Hello PF :smile: i am stuck with a concept of weighted resistor D/A converter. For a 4-bit resistive ladder, VA={V0/R0+V1/(R0/2)+V2/(R0/4)+V3/(R0/8)}/{1/R0+1/(R0/2)+1/(R0/4)+1/(R0/8)} I want to find out how the equation is derived but have no clue. Thanks.
  40. K

    How Do You Calculate Input Signal from Analog Meter Readings?

    Homework Statement 1. For the pointer position in the diagram, what is the input signal if the range is set at 0.3v? (i was just wondering if my path to the solution is correct) (arrow pointing at 1.75) picture attached The Attempt at a Solution Range / scales maximum = #...
  41. A

    How Do Analog Computers Handle Complex Computations?

    I don't know if analog computers exist or not but if they were to be made, how would they work? I have idea of how digital computers work, how memory, processor etc. work. With analog signals, you can perhaps do basic operations like addition, subtraction using amplifiers but how about...
  42. E

    Digital or Analog Signal Inversion

    I would like to take an incoming signal (digital or analog), invert it, and send it to an antenna. What is a simple high-level approach to this?
  43. F

    Simple analog voice distortion circuit

    Hi, I'm trying to build a simple analog voice distortion circuit, without any ICs if it's possible. It can get pretty hard to hunt down a specific IC around here. Anyhow, my idea was to get a mic, a speaker, a few oscillators, analog multipliers and RLC filters to build a real time...
  44. N

    Coupled oscillators analog to EIT - do I miss something?

    Hi, I have posted this question to "classical physics" forum, but now I think this forum might be more appropriate. I have no idea how to move the thread here, so here is a copy.. The question seems trivial, but I want to check if I miss something. Homework Statement I'm trying to...
  45. E

    Understanding Analog-to-Digital Conversion for Digital Computing and Processing

    Right now I am a computer engineer. I really love digital and want to focus on it because it uses logic. Analog is a bit more complex in that signals are not only 1 or 0, but sampled with many values. Anyways, I took digital logic and design courses, but I am unsure if i should take any...
  46. M

    Could packet round-trip times be an analog to qubits?

    I'm a programmer who is trying to figure out if there is any possible way to implement a pseudo-quantum cryptography algorithm without quantum computers, or is Bell's Inequality something that is going to get in the way of that goal? Or if I am anywhere in the ballpark. I wouldn't be surprised...
  47. S

    Analog signal conditioning circuit

    Hi, For any biomedical applications, the sensor output has to be amplified and digitized. For amplification, we use Instrumentation amplifier. But the output of IA has some dc voltage. So, how to suppress the dc voltage. At the same time, all biomedical signals are low frequency signals in...
  48. B

    Analog multiplexer - resistor at input

    Hello PF! I've been quite busy on my faculty, doing my academic final work. Anyway I need somebodies expertise which involves analog multiplexers. I am using MPC506 Datasheet http://www.ti.com/lit/gpn/mpc506 I tested it and gives nice result at 5 MHz sine wave, which is more than good for...
  49. J

    Finding sampling frequency for analog to digital conversion

    The input signal to an analog to digital converter is x(t) = 5.4 cos (134.5πt + 0.1π). The output from the converter is y(n) = 5.4 cos (0.47πn - 0.1π). Compute the sampling frequency (samples per second) of the analog to digital converter. Hint: the continuous-time input signal is...
  50. B

    The rotational analog of Ehrenfest's Theorem

    Homework Statement Show \frac{d}{dt}\langle\bf{L}\rangle = \langle \bf{N} \rangle where \bf{N} = \bf{r}\times(-\nabla V) 2. Homework Equations . \frac{d}{dt}\langle A \rangle = \frac{i}{\hbar} \langle [H, A] \rangle The Attempt at a Solution I get to this point...
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