This board allows you to construct a 1+n (n x households + entrance) audio building intercom. The course covers new installation of a multiple-speaker intercom system or enhancement of a simple system into a multiple installation. All regulations which need to be followed are also covered. The system can be used for intercom communication between multiple participants. By blocking the option to listen in, the system can also be modified to allow individual person-to-person communication. The door opener can be operated by any of the connected users. The system can additionally be combined with stairway lighting circuitry.
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