01-06-2017, 10:18 AM
Fear of robbery and robbery always annoys many people. When the lock and keys become less secure, one can seek the help of electronic security systems. Such a portable security system is described here. This electronic configuration is automatically activated when the intruder enters the unauthorized entry area. It automatically activates the fixed line number and redials the last dialed number from the conventional telephone. All we need is to make minor changes to activate this phone as it functions to become automatic dial circuit. Therefore, when the intruder enters the area, activates the circuit of the sound activation sensor or infrared beam obstruction circuit, the remarking circuit is activated and gives a ring tone to the receiving end. It can be a mobile phone or any landline or even the police control room.
Circuit diagram: