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    Switching polarity of motor

    Sorry to disappear, I thought the site would email me when replies were posted.  Anyway, I don't have any experience programming.  I'm getting my masters in fine art, so I know a lot about welding and oil paint and all that, but this is my first foray into electronics other than simple wiring...
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    Switching polarity of motor

    I'm trying to figure out a simple way to have a motor, hooked up to a timer circuit, that will switch polarity at a set interval.  In other words, after, say 3 minutes, the polarity going to the motor will switch, putting the motor in reverse, then after another three minutes switch back.  I'm...
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    Need help with sound sculpture

    I'm a grad student at Rutgers University, working on my Masters in Fine Arts thesis show, and would like to build a piece that is nearly fully developed, except for one key part.  I'm building a sculpture that "plays" the paint-roller texture of a wall.  A small plastic needle runs down the...
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