Speakerphone Adapter Circuit

Posted on Apr 27, 2012

Using a Motorola MC34118 speakerphone IC, this adapter can be used with a regular telephone to provide speaker capability. This device is powered from the phone line, but it can be powered via an external power supply if the line loop current is marginally low T.

Speakerphone Adapter Circuit
Click here to download the full size of the above Circuit.

An external phone is needed for ringing and dialing functions.

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