| In this video we will understand:    Some programming problems     in classes. | 
  Title:     Touch plate based door bell     Circuit:        Components:    IC 555  Resistors: 1 M, 100k, 330 ohms  Transistor: BC547  PN2222A  Capacitor: 10n  1 Copper plate : as touch plate.  A 6v battery  An LED / Ic UM66     Description:   This is the simple circuit for touch plate based security system. In this project what basically done is, circuit detects stray voltages produced by mains voltage and electrostatic built  up in the room.If sufficient static voltage is detected by the plate then chip will charge up. Transistor BC 547 or PN2222A is used basically to increase the sensitivity.In place of led just connect IC um 66(melody IC).   Applications:    In homes, of course.  This can be specially used in places like hospitals, when patients need to call doctor by himself.     
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