Delay device for turning off the light in the car. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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The proposed device allows you to delay turning off the light after closing the door, which allows the driver to easily insert the key into the ignition lock at night.
The scheme of the device is simple and does not require comments. It should only be noted that the VD1 diode is necessary to prevent the discharge of the capacitor through the alarm circuit if it is installed in the car and connected to the door buttons.
The device is mounted on a printed circuit board, the appearance of which from the soldering side is shown in the figure.
Relay P1 (from the mounting block) is inserted into the terminals used in automotive wiring, soldered into the board. Wire from door buttons Kn. disconnected from the lamp and connected to the diode VD1. Lamp L. is connected to the contact group of relay P1. The delay time in seconds can be estimated by the formula:
t=R1*C1
(resistance in ohms, capacitance - in farads), and, at the indicated ratings, is 4 ... 5 thousand. This device is used on a car in conjunction with the Enforcer alarm.
Publication: N. Bolshakov, rf.atnn.ru
See other articles Section Automobile. Electronic devices.
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