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
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