Dual-tone phone 160,168 controller circuit

Published:2011/6/29 2:28:00 Author:Fiona | Keyword: Dual-tone phone, controller | From:SeekIC

Dual-tone phone 160,168 controller circuit is shown as below,the function of this controller is the same with the controller's.The two controllers' basic principle is:add a homemade electronic switch between telephone and switchboard,only the user who officially calls 160,168 information desk can make the electronic switch be connected.



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