A simple car watchman. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Security devices and alarms
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The proposed car watchman is characterized by simple design, high reliability and does not require adjustment. It is assembled on one relay according to the scheme shown in Fig.1.
Ris.1
The watchman can be used on vehicles in which the interior lighting pushbuttons SB2 - SBn are open when the doors are closed. On Zhiguli vehicles, installation of door switches is not required, since standard door switches are used to turn on the EL1 and EI-2 lamps of the interior ceiling lamps when the doors are opened. The same switches can be installed in the trunk and under the hood of the car.
The security watchman is switched on by the SA1 toggle switch, which is placed outside the car, for example, in the front part under the bumper. When you turn on the SA1 toggle switch, the security device goes into armed mode, which practically does not use battery power. This is the undoubted advantage of this security watchman. When opening any of the doors, trunk or hood, the contacts of the corresponding switch SB2 SBn or the rocking sensor SB1 will close, current will flow through the coil of relay K1 and its contacts 4 - 5 and 6 - 7 will close. Contacts 6 - 7 will block the push-button switches SB1 -SBn , and contacts 4-5 close the power supply circuit of the standard signaling device VA. If all doors, trunk and hood are closed, the horn will still continue to sound. To turn off the sound signal, it is necessary to de-energize the relay K1 with the toggle switch SA1.
The car watchman uses a 1 V relay K12 with two pairs of closing contacts. Diode VD1 is designed to protect the contacts of the relay K1 from damage when a large current of lamps EL1 and EL2 of the interior ceiling lamps flows through them. The diode can be of any type for a current of at least 100 mA and a voltage of 15 V, for example, D226, D237, KD5Yu, KD522. The disadvantage of a simple car watchman is that the SA1 toggle switch, which turns it on and off, is located outside the car, and the horn does not turn off automatically.
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