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Phone adapter schematic for domestic purposes

In many cases, a phone call outside and take more than that while high utilization rate, but the confidentiality bad. At least the components of the device to effectively solve this problem. When asked to pick up the phone who has priority, then pick up those silent; answer the phone when the A, B and two phones ring simultaneously, the first hook in the priority to pick up after those who are silent. Call A, B machine mutual confidence.
Work

Circuit shown in Figure 1. A, B and two phones via relay J1, J2 and then outside in a L1, L2. Figure in the state relays J1, J2 are in the free state. Thus A, B and two outside phone are connected. When an incoming call, the ringing voltage through the coupling capacitor C1, C2 are the two phones ringing. Suppose a machine first hook, the relay J1 provides the dc path, pull the contacts (ie the moving contact from the top into the bottom), which cut off the telephone B pathway. If this is the first telephone hook B, a similar, put a cut off telephone access, which features complete confidentiality to each other. By phone, who should pick up the first one who will take an external line, then pick up silent.
Selection and production of components
Circuit capacitors C1, C2 of the role of first offer for the exchange of ringing and voice channel; Second, to prevent the dialing relay produced beat. Generally used 1000u electrolytic capacitors. SPDT relay selection (5 feet), coil voltage of 9V's. Access to the entire device to be to distinguish between positive and negative outside.

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Phone adapter schematic for domestic purposes