Read about filters | 11 Discussions | Page 1

  1. N

    Stargazing Is there any material I can use for an aperture solar filter?

    I live in a small town and would like to make some observations today. However i dont have a solar aperture filter, i only have an eyepiece filter of which i do not trust. So is there any household items, materials i could use safely to save me from from ordering on the net and waiting however...
  2. A

    DC estimator algorithms

    I wanted to remove the dc component from a signal but i can't use the average method because i have only a half cycle sampled not a full cycle . Is there any algorithm or method that can remove the dc component using only a half cycle? (The signal is sin(x)+2*sin (2x) +3*cos (3x)+4*cos (4x) +5...
  3. flyguille

    B Why adding more polarized filters results in more light passing?

    I was watching this video ... And basically the video show how adding in middle angle polarized filters it makes more light to pass. Then comments about quantics and blah blah blah. Why cientifics thinks lot weird and how was discard the following line of a more natural thinking: My...
  4. adamaero

    OpAmp general rules-of-thumb (educated guess) on filter type

    Homework Statement For example, what type of filter is this: How can one tell, as a general guideline, without finding the transfer function? I think finding the transfer function is the only real way to tell for sure, but what is a quick way to make an educated guess? The Attempt at a...
  5. Z

    Magnitude of the transfer function

    Hi all, In one of my problems there is a question with a plot of the transfer function magnitude versus frequency. In the graph I notice that the magnitude of the transfer function is greater than 1. This is confusing as I thought that filters are not able to increase the magnitude of the output...
  6. W

    Combining High and Low Pass Filters

    Homework Statement Suppose we have a noisy signal (superposition of many frequencies), but we are only concerned with a particular part of the signal within the noise at a frequency f(desired) = 1 GHz. In a sentence or two, explain how you could isolate the desired part of the signal by using...
  7. khurram usman

    Upsampled input to an Adaptive filter?

    I will try to explain the issue I am having as clearly as possible without going into my coding or maths. I have my own and a MATLAB Central implementation pf standard LMS in MATLAB. Fixed step size. No normalization or other stuff. I am trying to use it in a system identification setup. I...
  8. M

    Optical and electrical bandwidth "outside" air

    My questions is about the conversion of a range of wavelengths in Hz, such as for an optical filter, in a medium different from air. Since the refractive index n is higher than 1, (let's say n=1.5) and than the value of c is almost 2x108 m/s, also the equation in the link below has to be...
  9. pretty_fly

    Opamp shaping amplifiers

    Hello everybody, nowadays I am working on shaping amlifiers and need guidiance about how to design one and do its simulations before pcb design and manufacturing. When googling about shaping amplifiers i found documents mostly about filters (active and passive), which i know works for rejecting...
  10. Captain1024

    Help Finding Transfer Function Vo/Vs

    Homework Statement Find ##a)\ H(s)=\frac{V_o}{V_s}## of the filter in the circuit below. ##b)\ ##The center frequency ##\omega_0## ##c)\ ##The band-width B Correct answers: ##a)\ H(s)=\frac{6s}{12s^2+11s+1}## ##b)\ \omega_0=0.28\frac{rad}{s}## ##c)\ B=0.71\frac{rad}{s}##...
  11. L

    Bootstrapping Amplifiers, and Signal Bypasses

    Hello, I am reading The Art of Electronics, and I have two specific questions regarding examples it has introduced. I am dealing with bipolar transistors the current chapter. I think my questions mostly stem from not understanding concepts. The text has introduced the technique of...
Top