How to open an intercom without a key: effective techniques, detailed instructions

Information on how to open the intercom without a key will come in handy if you lose a standard device to access your own entrance. They cannot be used to commit illegal actions. However, it is better to save the data necessary for personal use in the smartphone's memory. They will help you solve the problem when the situation arises.

With the use of the energy blow "Wof-Hu", you can quickly open the door to the entrance. Before mastering this effective technique, you can use the instructions given in this article.

Intercom - what is it, what is it for, scope

These convenient devices are installed as standard when equipping apartment buildings. They perform several useful functions simultaneously:

Schematic diagram

This figure shows the main components of the standard equipment. The call unit is installed on the outside front door... It has keys for dialing the apartment number, a special contact pad. An electronic key fob ("tablet") is pressed against it to unlock the electromagnetic lock. The control unit checks that the code of this key matches the sample. From the inside, you can turn off the power supply to the lock and open the door using a special button.

It is known that utility workers have access to entrances with various intercoms. They do this using several techniques. A detailed study of them will allow you to find out how to open the intercom door without a key.

An effective way is a cache with a "pill" in the bushes near the entrance

The principle of operation of the intercom - device, encoding

Subscriber connection diagram

When you press the button on the call unit, the signal through the switching unit goes to the handset in a certain apartment. In this example, tens and ones buses are used to connect subscriber units. They also use digital switches that generate a coded signal. In this variant, it is permissible to connect more than 200 apartments using a two-wire communication line.

After picking up the receiver, you can find out the purpose of the visit. If necessary, a feedback signal is given by pressing the button. It removes the voltage from the electric magnet, after which the door can be opened.

In a modern call panel, the main functional parts are installed in one block

The case is well protected from weather and mechanical influences. Typically, the manufacturer offers a vandal-proof design that makes even intentional damage difficult. The speaker (1) is covered by a sturdy grille. The microphone (5) is hidden behind a narrow opening. Some models have an infrared light (2) and a camera for video monitoring. A “pill” or other specialized device is applied to a special area (6), in which a code for opening is written.

Built-in indicators (3) show not only the number of the called apartment. In the appropriate mode, they show the codes that are needed to configure. On the keypad (4), the following typical designations are used:

Schematic diagram

In addition to the power supply, several functional parts are installed on the printed circuit board:

The main ways to open the intercom without a key

The above information allows you to draw the correct conclusions about the appropriate techniques. The codes are stored in the memory in an encrypted form, so even if the case is opened from the side of the entrance, it will not be possible to make changes to the settings without special knowledge. You will also need a special device (programmer) for erasing old and entering new data into memory.

We are considering a more difficult task, how to get access from the outside with the condition of the safety of the case.

A duplicate key will come in handy

The picture shows the classic "pills" (1) and more modern non-contact modifications (2). The first ones are applied tightly to a special socket. The second ones also need to be pressed against a special site, but less accurate actions, small gaps are acceptable.

The second way is to enter the unlock code that opens the door or access the service menu. The second option opens up additional opportunities for fine-tuning the equipment. We note right away that enumerating various combinations manually will not work. In modern intercoms, complex coding is used, which will have to be deciphered with a similar technique for many months. Some manufacturers install special protection that blocks access to the system when such malicious actions are detected.

Below is how to open any intercom without any extra mental effort. It should be emphasized that these methods will not always help to get the desired result. They can damage the door itself, the electronics of the intercom. Nevertheless, for the sake of completeness, we present the necessary steps:

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Is it possible to make a universal key for an intercom with your own hands

It is inconvenient to carry a lot of duplicates with you in order to pass unhindered to your mistress and wife, to pancakes to your mother-in-law and to your office. Meanwhile, if you go to a specialized workshop, you will be offered just such an option. The fact is that each manufacturer creates a unique coding system. The same types of keys can be used. But you will have to purchase those that are suitable for a particular intercom model.

Thus, "universal" tablets for employees of a service company, public utilities only open devices of specific manufacturers. Moreover, quite often their effectiveness is limited by the framework of the region, by the product series.

A true universal intercom key

Homemade electrical circuit

To reproduce such a design on your own, certain skills are needed. Controllers for reading information and connecting to a PC via a USB port are installed here. The device is able to copy data from a working key.

Its free programming is also available. In this case, it is necessary to find out what algorithm the manufacturer uses. If you need a universal key for the Metacom intercom, you should take into account the peculiarities of continuous code supply with a change in current consumption / resistance. As standard, a packet of 4 bytes is sent, one of which is needed for parity. It remains to find a valid code on the Internet and write it into the device's memory.

Factory made programmer

How to open an intercom without a key: unlocking products from different manufacturers

If we exclude the barbaric methods of the category "there is no reception against scrap", the study of complex electronic circuits and soldering techniques remains. You will have to purchase additional equipment, learn the basics of programming. It makes no sense to consider the purchase of factory programmers and duplicate keys in detail.

There remains one acceptable simple option: how to open a visit intercom without a key using service codes. It is these techniques that are described below. The use of a standard password to open the door assumes that it has not been changed after the installation of the equipment. The tables show these codes for different models. After entering the service menu, access to individual settings is opened.

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This technique is designed to work with one user, so there is no keypad. Therefore, there is no possibility of manual input. In multi-apartment buildings, such systems are installed at the entrance with a concierge who is on duty around the clock. The only access option is to make a duplicate of the original key.

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