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| Electronic Projects Design/Ideas/Reviews Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. |
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13th October 2002, 01:09 PM
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| New Member  |  Need help building a doorphone intercom Hi I am looking for schematic/idea how to build an intercom panel for my home telephone switchboard. i have one free extention as a panel extention. what i need is, a circuit that upon pressing the call button this circuit "open" the mic and speaker and generate a dtmf tone (like "0") this acion will ring to the telephone switcher and someone who pick up the phone can speak freely to the panel. i hope i explain my self right :-) Thanks pasosh |
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