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Generating Harmonics

Discussion in 'Electronic Repair' started by ooi_yw, Oct 23, 2005.

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  1. ooi_yw

    ooi_yw Guest

    Hi guys, is there any way of generating harmonics? Harmonics are
    generated by the non-linear loads such as the light dimmer. Besides
    light dimmer, are there any more circuitries that can be built that can
    produce harmonics at the output?

    One more question is that, normally harmonics affect the main power
    supply. How should I analyze this distorted signal? Should I get the
    waveform from the main power supply?

    Hope you guys can give me some opinions and guidances. Thanks.
  2. Guest

    What frequency range do you want harmonics for?. There is a several
    order difference of magnitude between power line harmonics and those in
    the MHz range, ad totally different ways of generating them.

    H. R.(Bob) Hofmann
  3. ooi_yw

    ooi_yw Guest

    hei. lets say the fundamental frequency is around 50Hz.. so the
    harmonics should be 100Hz,150Hz, 200Hz.. and so on. BEsides that, i
    think a normal circuitry that can produce a distorted signal is good
    enough. Please advise. thanks
  4. bg

    bg Guest

    A pure sine wave does not contain harmonics. As the harmonics are added, the
    waveshape changes. At low levels of harmonic content or distortion, it is
    difficult to detect the change in waveshape with an O scope. Instruments
    such as a spectrum analyser, a wave analyser, or a distortion analyser are
    better suited to detecting the harmonics. There is software such as Spectra
    Lab and others that will turn your computer and sound card into any of these
    instruments. An easy way to generate harmonics is to clip a sine wave with a
    diode clipper, producing a square wave. Spectra lab also contains a
    generator capable of generating multiple tones. The levels at each tone are
    adjustable, therefore you can set the harmonic content at any frequency.
    ooi_yw wrote in message
  5. Guest

    Sounds like you want -all- the harmonics.

    Clipping gets you only the odd harmonics, so 50, 150, 250, etc.

    A triangle wave is also only odd harmonics. Triangle wave is a
    symmetrical gradual rise and fall with sharp peaks.

    For all the harmonics, you want a sawtooth wave. That's the one where
    the rise is gradual and the fall vertical or vice versa.
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