Press the number outside the gate of the residential building to talk to the owner, and then the owner opens the door. What's your name? Is that the doorbell?

Building doors walkie-talkie is a kind of door control and intercom control device installed at the entrance of building security door, which is generally used at the entrance of residential quarters.

Visitors call the residents at the door of the unit through the intercom host. After the residents agree, they can open the electric door lock of the unit before visitors can enter the building. As long as the household presses the electric lock key on the extension, the electromagnetic coil can be energized, so that the electromagnetic mechanism drives the connecting rod to move and the control door is opened.

Each door switch corresponds to an extension of a household, which is actually a power switch. After pressing the switch, the home power supply is turned on. When the extension is turned on, the music in the extension starts. After the extension goes off-hook, the fork spring switch will switch the electricity to the amplifier circuit, and the dialogue can be carried out.

Extended data

Classification of building interphones

According to the extension function, the extension can be divided into wall-mounted extension and embedded extension, as follows:

1, wall-mounted extension

The extension installation method is surface mounting, and the extension installation is mainly carried out after the extension is fixed with the wall through the screws on the extension base or the fixed mounting backboard. Wall-mounted extension is convenient to install, but the extension itself protrudes more from the wall, and the visual effect is not good.

2. Embedded extension

The installation method of extension is concealed installation. Firstly, the embedded bottom box of the extension is installed in the wall, and then the extension is fixed on the embedded bottom box. Because of the large expansion space of embedded installation, more extended functions can be loaded.

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