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Resonance Basics

Discussion in 'General Electronics Discussion' started by Nanda sinha, Oct 6, 2014.

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  1. Nanda sinha

    Nanda sinha

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    Oct 6, 2014
    what does it mean that a system "oscillates" with resonance frequency ?(<< basically oscillates term led me to confusion .As we know that the magnitude of output will be maximum for the same input but at resonant frequency)
     
  2. Gryd3

    Gryd3

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    Jun 25, 2014
    Have you ever made a glass 'sing'? You wet your finger and slide it along the rim. If you move at just the right speed the glass will sing. (usually wine glasses, or glassware with a stem)
    You can also sing in the shower, and certain notes will resonate and seem much louder ;)

    Also, calculating the output at a resonant frequency can be difficult, but you are right in that the output is typically highest. When something oscillates, it is vibrating or moving with a frequency. This can be mechanical like the glass, or electrical like a joule thief. The resonant frequency is the frequency at which the object is tuned for (either accidentally or intentionally).
    I may not have explained it the best, but perhaps you got the idea?
     
  3. Nanda sinha

    Nanda sinha

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    Oct 6, 2014
    So the oscillate part is the only part for those system (basically mechanical system,which can vibrate) and the highest amplitude part we can associate with any electrical circuit ?(Is that correct or I am wrong ??)
     
  4. BobK

    BobK

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    Jan 5, 2010
    No, electrical systems oscillate as well. Where do think the sound comes from in Moog synthesizer, are there little glasses in there and midgets running their fingers around the rims?

    Look up oscillator circuit. There are many different ones.

    Bob
     
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  5. Gryd3

    Gryd3

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    Jun 25, 2014
    As bob has stated, this is true for electrical systems as well. Well.. and anything else that may move... Light, sound, electricity.

    The oscillate part can be applied to any system, and so can the highest amplitude part.
    In order for electrical components to oscillate, there needs to be a changing electron flow. This change could be two directional (forward and back) or 1 directional, but the result is that the electron flow changes at the given frequency. This is the oscillate part. The amplitude part is how much actually changes (e.g. a higher voltage).

    There are two pieces to this puzzle to understand. There is an input and output to consider.
    So... singing in the shower. Your voice is the 'input' for the system. You are providing an oscillation to the shower. This sound wave from your voice is the oscillation. Now as you change your note, you will come to realize that there is a note you can hum, sing, etc. that sounds much much louder in the shower. This is the resonant frequency of the shower stall. In this example, the input will resonate within the shower chamber and certain frequencies will resonate much better (based on the resonant frequency of the shower stall). These types of systems are built intentionally or accidentally and can be setup for things like very narrow audio, radio, or light filters. When these things are found accidentally they can cause damage. (Usually to machinery... if the vibration input is matched closely to the resonant frequency of the machine then the vibration can grow to be very large and destructive.)

    Now to look at outputs, you can look at things like quartz crystals or whistles. The characteristics define how they start to vibrate by themselves. You don't whistle or hum into a whistle, but they produce sound at the resonant frequency of the chamber.

    So when you want to learn about resonance, it could be applied to many different things... Are you wanting to find out how it causes frequencies, or how it reacts to frequencies?

    Resonance Wikipedia Page : http://en.wikipedia.org/wiki/Resonance
    Here is a video showing mechanical resonance : (The bridge itself oscillates from wind)
    (You can also research 'tool chatter' if you are metal or wood shop inclined)
    CO2 and HeNe lasers also operate at resonance. (Require an input matched to the laser's resonant frequency to produce a very high output)
     
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