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  1. W

    to make a ultrasound speaker

    How to make an ultrasound speaker that'll produce above 20khz frequiency to repell mosquitos???????any great idea
  2. W

    crt tv horizontal display problem

    The crt tv cant display horizontally. The HOT and yoke coils are ok.....when horizontal yoke coil connected then the tv dont turn on...when removed then it ONs.
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