Whole House Telephone Intercom Update

Would you like a Whole House Telephone Intercom of your own, but without building custom circuitry or dedicating an Arduino board?   Introducing the Add-A-Com Whole House Intercom for Standard Telephone Systems, available from this amazon.com product page.

This commercial version features a jumper to enable/disable the call hold and transfer feature, another jumper to support stand-alone operation, a more efficient power supply that requires no heat sink, and a more robust ringing signal.   It is supplied with everything you need for a typical installation - nothing else to buy.   For details on installation and operation, you can download this User Guide.

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