The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone is connected to a telephone line. If another telephone is ...

The circuit provides a simple illustration of a door phone intercom system having a two-way communication using the features of LM386 amplifier. Intercom – short for intercommunication, is an ...

My condo has an analog intercom/buzzer system. When someone buzzes up, it rings the line in my unit. It it hardwired into the condo - I have no landline service. I can then pick up the call and press ...