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DTMF telephone without telephone line

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buts101

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how can i make the circuitry so that dtmf telephone doesn't need main telephone line...but telephone set responds to the number dialed...i.e. so that i can trap the frequency from dialed number and used it to control some devices..
 

buts101

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i didn't any article related to my problem.
 

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House_Cat

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There is a well designed and simple to build DTMF intercom circuit using telephone handsets shown at:

**broken link removed**

The details and parts list for the DTMF portion are at:

**broken link removed**
 

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