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help,urgent!!

Discussion in 'General Electronics Discussion' started by seesy123, Feb 11, 2009.

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  1. seesy123

    seesy123

    1
    0
    Feb 11, 2009
    hey,i wanna dsign a cicuit where when people entry or exit,the siren will sound(mostly can find shop).anyone know how to design or what components in needed.thanks
     
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