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Motorola MC34118 Speakerphone Adapter Circuit

2016-02-15 00:59  
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A pocketspeakerphone adapterfor a landline-based common telephone to provide the common telephone with speakerphone capabilities.  The conventional handset of a conventional common telephone is disconnected from the handset jack of its base unit, and the pocket speakerphone is temporarily connected in its place to the handset jack of the base unit using a conventional handset cord.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.An external phone is needed for ringing and dialing functions. The conventional common telephone base unit provides interconnection with the public switched telephone network (PSTN), while the pocket speakerphone in accordance with the principles of the present invention provides a temporary adaptation of the land line common telephone to operate as a speakerphone.

Speakerphone Adapter Circuit