Telephone anti-theft trick lock circuit

Published:2011/7/8 10:36:00 Author:Fiona | Keyword: anti-theft trick lock | From:SeekIC

Telephone anti-theft trick lock circuit is shown as above, this lock's specific functions as follows: 1.1~4 any limited prefix numbers, such as 0 , 173 , 9688 , can lock 1000 groups. 2.4 * password,confidentiality is strong.3.it can change the password and limited number at any time.4.* it delays about 6S to automatically shut after call to prevent free call on limited number. 5 Setting the password and limited number are operated on telephone.6.When the outside line is parallel operation theft,it makes a alarm sound to disturb the theft phone, while the red light is bright.7.The green light is bright when the users calling,it says the line is busy. Circuit is divided into limited local dial-up and parallel operation thief dozen two completely independent parts.



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