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Negative charge circuit to repel snow paticles

Discussion in 'Electronic Basics' started by Rajkumar512, Nov 24, 2003.

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  1. Rajkumar512

    Rajkumar512 Guest

    Is there any one who can advice me on building a negative charge circuit. I am
    a beginner at circuit designing and i want to confirm my ideas to build a
    Negative Charge Circuit.

    I am planning to use a 555 timer to generate 1kHz clock frequency and use a
    operational amplifier LM741 to bring it down to below 0 Volt. I am using a long
    copper wire connected to op-amp output for negative charge. I am also aware
    there are other passive component needed, but i can work that out by myself.

    The idea of long copper wire which will be place in zig-zag position on top of
    wooden/plastic tray, is basically to test whether it has the potential to repel
    snow paticles which is said to be negatively charge by many enviormental
    research.

    My Question:
    Is positive voltage inverted to negative by an Op-Amp considered as negative
    charge?

    Thank you.
    Raj
     
  2. Don Bruder

    Don Bruder Guest

    Negative is negative, I'd say. Whether that means a connection to the
    "-" post of a battery, the "-" leg of a rectifier's output, or the
    inverted output from an op-amp being fed a postive input, it's still
    below 0 volts, which is, last I knew, pretty much the wroking definition
    of negative.
     
  3. Gareth

    Gareth Guest

    That sounds like an interesting experiment, but the electrostatic force
    is very weak and I would be surprised if you were able to produce a
    noticeable effect without very high voltages. Do you have any
    information about how much negative charge there is on a snow particle?
    You could then get an idea of how much force will be exerted on it and
    how much negative charge you would need to see a significant effect.

    I don't understand why you need an op-amp and a clock - if you want a
    negative charge why not just connect the negative side of your power
    supply (which I assume is a battery?) to your zig-zag copper wire, and
    connect the positive side to earth?

    You may be able to get a more significant negative charge by using
    static electricity. For example you could rub a balloon on your hair,
    it will then become charged (I can't remember if it gets positive or
    negative charge), you could then see if it attracts or repels snow
    particles. A problem here is that the balloon will not stay charged for
    very long. Perhaps a better way would be to support your zig-zag copper
    wire on some very good insulators, you could then charge the balloon and
    use it to charge the wire and repeat this charging process regularly.
    This would be like a very crude Van de Graaff generator.

    Have a look at:

    http://science.howstuffworks.com/vdg.htm
    --
     
  4. Rajkumar512

    Rajkumar512 Guest

    I don't understand why you need an op-amp and a clock - if you want a
    The reason for using clock is to introduce pulse, it's just and idea i got it
    based on my past experiment with magnetics. It's like this, say a fixed and
    constant force of North Pole magnet is pushing another North Pole magnet, the
    distance is fixed at same point. But when i used a non-constant force at fixed
    North Pole magnet (like swinging) the other North Pole reachec greater distance
    of point. I hope you understand what i mean.

    The Op-Amp is to invert the positive clock to negative, (this is the point
    where i am not certain, and the reason for posting the message at this news
    group) I think by inverting below zero volt, may introduce negetive charge. My
    little knowledge say that zero is ground point, so more than zero is positive
    thus it's positively charge, if below zero it may be negatively charge. I am
    not certain about this but seeking others opinion and expertise to help me up.

    By the way, below are the some of internet resources that confirm me snow
    particles do carry negative charges and a site that says a scientist already
    did this experiment before i originally though of it.

    http://snobear.colorado.edu/Markw/SnowHydro/mol.html
    http://www.avalanche.org/~issw/96/art_29_.html
    http://abcnews.go.com/sections/scitech/CuttingEdge/cuttingedge020222.html


    Thanks for your opinion :)
    Raj
     
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